Wrexham Catalogue 05-05-15

Wrexham Mineral Cable...

Warranty Available. MINERAL
See website for details. INSULATED

COPPER
CABLES

...The True Fire Survival Cable

Product & Specification

CATALOGUE

www.wrexhammineralcables.com

02

Introduction

Established in 1989 Wrexham Mineral Cables developed a totally new and unique process for the continuous
manufacture of Mineral Insulated Cables - the only True Fire Survival Cable.

Now celebrating 25 years in business we have marked our success with the addition of a completely brand new £5m
manufacturing line & factory extension to compliment our existing plant. Our new manufacturing line will provide the
facility to manufacture much longer lengths of the heavy duty sizes such as 1H240mm² & 4H25mm², never before
available.

The specially designed equipment is housed in our 5,000 square metre purpose built factory located in Ruabon,
Wrexham, North Wales, United kingdom. Our success is due to our continued investment and commitment to
manufacturing a quality product while providing comprehensive customer service, making us the largest UK
manufacturer of Mineral Insulated Cables.

The quality and reliability of Wrexham Mineral Cables is recognised world wide and throughout the electrical industry.
Our cables are manufactured to meet British and European standards, achieving endorsements & certifications from
many regulatory bodies including BRE - LPCB, the world renowned approvals body for fire performance products,
Warrington Fire Research Centre and London Underground. The termination glands and increased safety seals are
SIRA - ATEX EExd approved.

Manufacturing

Purpose built and occupying 5,000 square metres with vast stock warehousing.

5,000 square meters of purpose built factory allow us to produce all our products in the UK ensuring 100% quality
and security of supply. Cables can be made to your requirements in longer lengths than any other Mineral Insulated
Cable manufacturer.

NEW PIC OF PRODUCTION LINE TO BE ADDED TO THIS BOX “Th“eOlvaerrge1s3t5UK
mmainlluiofnacmtuerterreos f
MminaenraulfaIncstuulraetded

tCoadbaletse””

MADE IN THE UK

Contents

04-07 Applications
08-09 Features and Benefits
10-13 Fire Performance
14-15 Specification
16-17 Standards and Approvals
18-19 Cable Supply
20-23 Cable & Accessory Selection
24-25 Accessories & Tools
26-31 Installation Practice
32-33 Projects & Special Products
34-36 Training & Middle East Approvals

04

Mineral Insulated Cables are used to provide circuit integrity for power and control circuits of critical
equipment in the following applications:

Car Parking Multi-storey & Moving Walkways/ Metrolinks
Underground Travelators/Escalators
• General Lighting
• General Lighting • General Lighting • Emergency Lighting
• Fire Alarm System • Handrail Lighting • Fire Protection Systems
• Fire Pumps • Recess Illumination • Public Address System
• Emergency Lighting System • Emergency Stop Start • Fire Telephones
• Exhaust Fume Extraction
• Security Cameras Controls
• Fire Detection and Smoke

Extraction

Hotels Power Generation & Petrol Stations
Distribution
• General Lighting and Power • Pump Circuits
• Stairwell Pressurisation • General Lighting and Power • Fire Alarm and Security
• Emergency Lighting
System • Fire Alarm and Security Circuits
• Fire Alarm System • General Lighting
• Emergency Lighting Systems
• Elevator Motor Supply • Smoke Extraction Fans
• Mains Distribution • Air Conditioning

PHOTO PHOTO PHOTO

Railway Tunnels/Stations Road Tunnels & Mines Shopping Centres

• General Lighting • General Lighting • General Lighting and Power
• Emergency Lighting • Emergency Lighting • Emergency Lighting
• Fire Detection and Smoke • Fire Detection • Fire and Security Circuits
• Fire Telephones • Public Address System
Extraction • Fume & Ventilation Systems
• Fire Telephones
• Public Address System

PHOTO PHOTO PHOTO

Applications

Building Services Education Buildings Building Exteriors

• Rising Main and Lateral • Fire Alarm System • Perimeter
• Feature & Security Lighting
Distribution Systems • Smoke Extraction System

• Underfloor Mains Distribution • Emergency Lighting

Systems • Elevator Motor Power Supply

PHOTO PHOTO PHOTO

Offshore Petrochemicals Airports

• High Integrity Circuits • Hazardous Area and Safety • General Lighting and Power
• Accommodation Blocks
• Lighting and Power System Wiring • Emergency Lighting
• Safety Systems
• Water Treatment • Fire Protection Systems

• General Lighting • Public Address System

• Emergency Lighting and Fire

Protection

• Motor Operated Valves (MOV)

PHOTO PHOTO PHOTO

Public Buildings; Theatres, Hospitals Transport/Interchanges
Libraries & Cinemas
• Fire Alarm System • Public Lighting
• General Lighting and Power • Smoke Extraction System • Fire Alarm
• Emergency Lighting • Emergency Lighting • Emergency Lighting
• Fire Alarm and Security • Elevator Motor Power Supply • Public Address
• Theatre Critical Power Supply
Systems
• Mains Distribution
• Smoke Extraction Fans

PHOTO PHOTO PHOTO

06

Grand Opening of Our New Factory

Waiting for Text - Wrexham Mineral Cables had the great pleasure of receiving the First Minister of Wales, the Right
Honourable Carwyn Jones AM, for the purpose of opening our new 6m factory extension in Ruabon, Wrexham.

Applications

General Electrical Services Emergency Power & Lighting Systems

• Small Power - Ring and Radial • Fire Alarm Equipment • Emergency Lighting

Circuits • Smoke Dampers and Curtains • Sprinkler Control Systems

• Low Voltage Distribution - • Fire Door’s and Shutters • Emergency Power Supply

Rising and Lateral Mains • Smoke Extract Units • Control Centre

• External Lighting Circuits • Voice Alarm Systems • Lifts and Escalators

• CCTV Systems • Fire Telephones

Wiring in Potentially Explosive Atmospheres

Wrexham Mineral Insulated Copper Cables (MICC) are constructed using solid copper sheath, solid copper
conductors and highly compacted powdered magnesium oxide (MgO) insulation, totally preventing the passage of
flames, gasses or vapours via the cable to appliance (Reference BS EN 60079-14:2008).

Wrexham brand MICC wiring system fully meets the requirements for wiring zones 1 and 2 when using Ex (d)
flameproof & Ex(e) Increased Safety apparatus. Sira approval to BS EN 60079-0 & BS EN 60079-1 (GLANDS EX (d). BS
EN 60079-0 & BS EN 60079-7 (Seals) Ex (e).

Potentially explosive atmospheres may be found in locations such as petrol stations, chemical plants, gas production
and processing plants, paint works, oil refineries and depots, oil drilling and production platforms.

PfooutenndtiianlllyoceaxtpiolonssivseucahtmaPosa:sipnthWeorerkss may be
Petrol stations
Oil refineries and depots
Chemical plants
Gparoscpersosdinugctpiolannatsnd Oil drilling and production
platforms

08

Why Mineral Insulated Cable?

Mineral Insulated Cable (MICC) has been in use commercially since 1937, the fact that it is still widely used
today is evidence that it has not been bettered by any other cable system. Soft skinned polymeric cables are
a compromise in safety, fire performance and longevity when comparisons are made to MICC cables.
Any cable system that relies on polymers for conductor insulation will burn and will be very likely to fail in a
real fire situation, MICC cable does not rely on polymers for insulation.

Mineral Insulated Cable is totally Inorganic and Silicone free in construction. The main construction consists of
solid copper conductors (cores), highly compressed magnesium oxide (MgO) insulation and a solid copper sheath.
This unique construction gives melting points of 1083°C and 2800°C for the copper and insulation respectively.
This provides fire survival whilst continuing to safely carry a load for 3 hours at 950°C and for short periods of time in
temperatures in excess of 1000°C.

MICC cables can also be considered to be non-aging as copper and MgO will not deteriorate with age in most
situations. Cables normally need to be replaced as the polymers used for insulation breakdown causing the insulation
resistance (IR) to fall thus creating an unsafe system. The total life cycle costs of MICC cables in a building with a
typical 40 - 50 year design expectancy would be considerably less than those using an XLPE steel wire armored LSZH
fire resistant cable, thus off-setting any initial capital expenditure.

For the majority of modern installations, bare copper sheathed cable will suffice requiring no additional outer
covering. In this state the cable is resistant to oil, water and many other gases and liquids.

Where the natural corrosion resistance of the copper sheath is not sufficient, it can be augmented with an additional
LSZH (low smoke zero halogen) outer covering. This outer covering can also be used for coloured circuit identification
or visual appearance.

Current installations include:PHoewysehraSmtat1ioNnuclear

Houses of Parliament
Kensington Palace
University of Wales Lowry Centre New Amex Building
Manchester University Claridges Hotel Brighton

ULonuivgehrbsiotryough John Muir Centre
G(T2ao0ml1lc4ersoCsVosemAnmquueo)antwiceCaeltnhtre
St. James’ Palace HChosepstitearlfield Royal Harrods
Buckingham Palace Marks & Spencer dBeavkeelroSptermeeetnStt(aLtUioLn) Re-
Windsor Castle Memorial Hospital Sainsburys RKein-dgesvCerloospsmSetanttion
London Isle of Grain LNG Facility
Nostel Priory
Edinburgh Castle Iron Bridge Power Tesco
Heathrow Airport Station Asda
Manchester Airport National Trust
British Museum London Underground
Millennium Dome

Hardwick Hall

Features and Benefits

Airtight Small Overall Diameter Earth Continuity

Impervious to water, oil and MICC cables have a smaller MICC cables do not require
gas. diameter than soft skinned fire a separate earth continuity
resistant cables of equivalent conductor as the outer copper
Fire Resistant ratings. sheath serves this purpose
providing excellent low
resistance earth continuity.

High Operation Temps Inherent Flameproof
Barrier

With a non-flammable copper

Continuous maximum operating sheath the highly compacted

Will neither burn nor support temperature up to 250°C for MgO insulation will resist the
combustion.
the life of the cable, and for transmission of vapours, gases

shorter periods up to 1083°C, and flames between items of

the melting point of copper. equipment connected by the

cable.

High Mechanical Strength None Ageing Pliable

Mineral insulated cable is Wrexham Mineral Insulated
Cable is annealed using a fully
Withstand considerable stresses permanent and does not controlled in-line process and
such as bending, twisting and usually weaken or degrade with consequently is extremely
flattening. age under normal conditions ductile and easily manipulated
offering longer and safer life to follow existing wiring routes
and irregular shapes.
spans.

Warranty Available.
See website for details.

10

The True Fire Survival Cable

Whether you are involved in designing, specifying, planning, installation, operation or maintenance, safety is
paramount. MICC is the best choice of cable having a direct bearing on life and/or property, the safest cable
is the one which can not burn!
The terminology used to describe cables claiming a degree of fire protection is often misinterpreted. The terms;
‘fire resistance and fire performance’ are often applied to a wide range of products. However, because they are not
defined clearly and imply fire protection, it’s surprising how little protection is offered. Wrexham Mineral Insulated
Cable will survive for over 3 hours at 950 Deg C while receiving a direct mechanical impact and water spray on the
same sample of cable.
It’s worth remembering that compliance with the relevant fire safety standards is the minimum requirement, MICC
cables surpass BS 6387 C,W & Z, BS EN 50200 PH120 Enhanced, BS 8434-2. If you were in a real fire situation would
you feel safer knowing the cables used to protect the critical circuits exceed the standards, and not just a laboratory
controlled fire test? If the answer is yes then you can rely on Wrexham Mineral Insulated Cables.

OFF OFF

“Mineral
Insulated Cables

save lives”

Fire Performance

Circuit Integrity

BS 6387: 1994 Performance Requirements for Cables Required to Maintain Circuit Integrity under Fire
Conditions.
The standard details the following tests to categorise cable according to their fire withstand capabilities:

Resistance to fire Resistance to fire with water Rmeescishtaanniccealtoimfipreacwt ith Circuit integrity
Exposure to Gas Burner Flames spray EMSfxotoperuoe1nls5uBtirmnaergintaPoutat3Fnel0easml.siesecssotwnrudhciilknstwteirtvhaals Caifrtceuriet xinptoesgurirtey tmoafiinreta, winaetder and
EmS(dxOpipenrnfoauiensytueesaurdsner.tdvhStioveeFaeniFrlelteacaaxfmboptelreeogs1sbo5uaertrymleo6“wi5Wtno0)u”.Wtfioesasrt1e5r impact.

PERFORMANCE TABLE SYMBOL WREXHAM MI

RESISTANCE TO FIRE

650⁰C for 3 hours A SURPASSES

750⁰C for 3 hours B SURPASSES

950⁰C for 3 hours C SURPASSES

950⁰C for 20 minutes S SURPASSES

RESISTANCE TO FIRE WITH WATER

650⁰C W SURPASSES

RESISTANCE TO FIRE WITH MECHANICAL SHOCK

650⁰C X SURPASSES

750⁰C Y SURPASSES

950⁰C Z SURPASSES

12

Soft Skin Polymeric Cable

BS 6387 category C demands that cables perform safely for 3 hours at 950 Deg C. BS EN 50200 PH120 Enhanced
demands 2 hours fire resistance at 850 Deg C. The soft skin polymeric fire resistant cables shown below have
been subjected to only 10 minutes at 850 Dec C, as you can see the majority of the polymers used for primary and
secondary insulation have been consumed by the fire.
These cables claim to meet both BS 6387 CWZ and BS EN 50200 PH120, what would be left to protect them in a real
fire situation? One direct impact on any of these cables would most likely cause the conductors to touch and short
out rendering the appliance useless.

Fire Performance

Mineral Insulated Cable

Wrexham Mineral Insulated Cable is manufactured and LPCB approved to BS EN 60702-1:2002 and conforms to BS
6387 CWZ and BS EN 50200 PH120 Enhanced. The sample shown in Fig. 1 below has been subjected to 950 Deg C
for 10 minutes, the LSZH outer sheath though charred does not effect the overall performance of the cable.
Even after the full 3 hours at 950 Deg C the Wrexham Mineral Insulated cable in Fig. 2 is still fully functional and safely
maintaining circuit integrity. In fact there is little change to the copper sheath other than discolouration and slight
oxidization and we would be confident that this cable could take many direct impacts during the fire without failing.
This is why Wrexham Mineral Insulated Cable is the only true fire survival system.

Fig. 1

Fig. 2

“Mineral
Insulated Cables
maintain circuit

integrity”

14

Current-Carrying Capacity

LSZH covered or bare and exposed to touch
(COPPER CONDUCTORS AND SHEATH)

CONDUCTOR CROSS-SECTIONAL AREAREFERENCE METHOD C REFERENCE METHODS E, F, AND G
2 SINGLE-CORE(clipped direct) (in free air or on a perforated cable tray etc, horizontal or vertical)

CABLES TOUCHINGSINGLE-THREE-PHASE a.cSINGLE- THREE-PHASE a.c
OR 1 TWO-COREPHASE PHASE
CABLEa.c or d.c a.c or d.c 3 SINGLE-CORE CABLES FLAT
3 SINGLE-CORE & SPACED BY ONE CABLE
DIAMETER
CABLES IN TREFOIL
OR 1 THREE-CORE OR VERTICAL HORIZONTAL

FOUR-CORE CABLE
3 SINGLE-CORE

CABLES FLAT AND
TOUCHING, HORI-
ZONTAL OR VERTICAL

2 SINGLE-CORE
CABLES TOUCHING

OR 1 TWO-CORE
CABLE

3 SINGLE-CORE
CABLES IN TREFOIL
OR 1 THREE-CORE OR
FOUR-CORE CABLE

3 SINGLE-CORE
CABLES FLAT AND

TOUCHING

(mm²) (AMPS) (AMPS) (AMPS) (AMPS) (AMPS) (AMPS) (AMPS) (AMPS)

LIGHT DUTY CABLE (500 volts) 15 17 19.5 16.5 18 20 23
1 18.5 19 21 25 21 23 26 29
1.5 23 26 29 33 28 31 34 39
2.5 31 35 38 44 37 41 45 51
4 40
21 23 26 22 26 28 32
HEAVY DUTY CABLE (750 volts)
1.5 25

2.5 34 28 31 36 30 34 37 43
4 45 37 41 47 40 45 49 56
6 57 48 52 60 51 57 62 71
10 77 65 70 82 69 77 84 95
16 102 86 92 109 92 102 110 125

25 133 112 120 142 120 132 142 162
35 163 137 147 174 147 161 173 197
50 202 169 181 215 182 198 213 242
70 247 207 221 264 223 241 259 294
95 296 249 264 317 267 289 309 351

120 340 286 303 364 308 331 353 402
150 388 327 346 416 352 377 400 454
185 440 371 392 472 399 426 446 507
240 514 434 457 552 466 496 497 565

Notes:
• Ambient temperature: 30⁰C
• Sheath operating temperature: 70⁰C
• For single-core cables, the sheaths of the circuit are assumed to be connected together at both ends
• Fore bare cables exposed to touch, the tabulated values should be multiplied by 0.9

Specification

Voltage Drop

SINGLE PHASE a.c. or d.c THREE-PHASE a.c

CONDUCTOR 2 SINGLE-CORE 1 TWO-CORE CABLE 1 THREE OR FOUR- 3 SINGLE-CORE 3 SINGLE-CORE 3 SINGLE-CORE
CROSS-SECTIONAL CABLES TOUCHING CORE CABLE CABLES IN TREFOIL CABLES FLAT & CABLES FLAT &
SPACED BY ONE
AREA (mV/A/m) FORMATION TOUCHING CABLE DIAMETER*
14
(mm²) (mV/A/m) (mV/A/m) 9.1 (mV/A/m) (mV/A/m) (mV/A/m)
2.5 17 17 6.0 14 14 14
4 10 10 3.6 9.1 9.1 9.1
6 7 7 2.3 6.0 6.0 6.0
10 4.2 4.2 3.6 3.6 3.6
16 2.6 2.6 rxz 2.3 2.3 2.3
1.45 0.125 1.45
25 rxz rxz rxz rxz rxz
35 1.65 0.200 1.65 1.65 0.145 1.65 --- 1.45 0.170 1.45 1.45 0.25 1.45 1.45 0.32 1.50
50 1.20 0.195 1.20 --- 1.05 0.165 1.05 1.05 0.24 1.10 1.05 0.31 1.10
70 0.89 0.185 0.91 --- --- 0.78 0.160 0.80 0.79 0.24 0.83 0.82 0.31 0.87
95 0.62 0.180 0.64 --- --- 0.54 0.155 0.56 0.55 0.23 0.60 0.58 0.30 0.65
0.46 0.175 0.49 --- 0.40 0.150 0.43 0.41 0.22 0.47 0.44 0.29 0.53
---

120 0.37 0.170 0.41 - - - - - - 0.32 0.150 0.36 0.33 0.22 0.40 0.36 0.28 0.46

150 0.30 0.170 0.34 - - - - - - 0.26 0.145 0.30 0.29 0.21 0.36 0.32 0.27 0.42

185 0.25 0.165 0.29 - - - - - - 0.21 0.140 0.26 0.25 0.21 0.32 0.28 0.26 0.39

240 0.190 0.160 0.25 - - - - - - 0.165 0.140 0.22 0.21 0.20 0.29 0.26 0.25 0.36

Notes:
* Spacings larger than one cable diameter will result in a larger voltage drop
Conductor operating temperature 70⁰C

16

Approvals

Manufactured and Tested To BS EN 60702 –1: 2002 (Formerly BS6207)
Certification of Assessed Quality Assurance No. 333 to BS EN ISO 9001:2008
LPCB Product Certification No. 333a/01

Approval Body Standard Reference Description

LPCB IEC 60331-1:2009 Tests for electric cables under fire conditions - Circuit
integrity - Part 1: Test method for fire with shock at
LPCB IEC 60331-2 a temperature of at least 830°C for cables of rated
voltage up to and including 0,6/1,0 kV and with an overall
LPCB IEC 60332-1 diameter exceeding 20mm
LPCB IEC 60754-1
LPCB IEC 61034-2 Tests for electric cables under fire conditions - Circuit
LPCB BS 5839-1:2013 ENHANCED to clause integrity - Part 1: Test method for fire with shock at
LPCB 26.2 a temperature of at least 830°C for cables of rated
LPCB BS EN 50200:2006 Class Ph120 voltage up to and including 0,6/1,0 kV and with an overall
LPCB BS 8434-2:2003+A2:2009 diameter not exceeding 20mm
LPCB C,W & Z OF BS 6387:1994
BS EN 50267 Tests on electric cables under fire conditions - Part 1-1:
Test for vertical flame propagation

Test on gases evolved during combustion of materials
from cables - Part 1: Determination of the halogen acid
gas content

Measurement of smoke density of cables burning under
defined fire conditions

Fire detection and fire alarm systems for buildings. Code
of practice for system design, installation, commissioning
and maintenance

Resistance to fire of unprotected small cables for use in
emergency circuit

Test for unprotected small cables for use in emergency
circuits. BS EN 50200 with a 930°C flame and with water
spray

Requirements for cables to maintain circuit integrity
under fire conditions

Gases evolved during combustion of electrical cables

Standards and Approvals

Testing B.S 6387:1994 CWZ (to the highest category)
To BS 4066 : International standard IEC 60331
Wrexham Mineral Cables are tested to the following: To Specification EME-SP-14-028-A1 (Fire Survival Cables
Warrington Fire Research – MICC)
Warrington Fire Research
London Underground BS EN 60702-2:2002
No. Sira 02 ATEX M170
Terminations EN 50014 amendments A1 & A2 &
For use with flameproof equipment in Zones 1 and 2,
Manufactured and Tested in accordance with apparatus, gas sub-groups IIA, IIB and IIC and all general
Sira Quality Assurance Notification applications.
No. Sira 02ATEX3304U
EC-Type Examination Certificate EN 50014: amendments A1 & A2 & EN 50019:2000

C-Type Examination Certificate
(Increased Safety Seals)

See page 35 for Middle East Approvals

18

Cable Type Drums

Bare Copper sheathed cables are available or with an The following cables can be supplied ex-stock on non-
LSZH (Low Smoke Zero Halogen) outer covering. The returnable drums.
standard colours for the LSZH outer covered cables are
Orange, Red, Black or White. Other colours are available LSZH
on request. Cable Sizes
Coil Length (approx)
Reels
m.
The popular Light Duty cable sizes are supplied as Orange
standard in 100 metre lengths on non-returnable reels
as follows: Red
White
Black
Drum flange dia mm.

Cable 2L1.5 2L2.5 2L1.5 500 750
Sizes 2L2.5 500 750
3L1.5 500 750
Length 100 100 4L1.5 500 750
(Metres) 4L2.5 500 1110
Bare Copper 2H1.5 500 1110
Type or LSZH Outer 2H2.5 500 1110
available 7L1.5 500 1110
Covered Other colours available on request.
Colours
available Orange, Red,
White or Black

Reel 400mm dia x
Dimensions 190mm width

Reel Bare LSZH 16.9 22.2
Weight 14.6 19.6

kg

Coils

With the exception of the previous reel sizes, cable is
supplied in coil form as standard. The coil diameters are
either 500mm, 915mm or 1370mm dependent on the
cable diameter.

Cable Supply

Cable Testing

The insulant of all Mineral Insulated Cables has an affinity for moisture. However, the inorganic insulant
utilised in the manufacture of Wrexham Cables has a self-blocking characteristic and can be left unsealed
during installation and storage without being adversely affected.

During a period of several weeks exposure, atmospheric moisture will only penetrate an unsealed cable to a depth
of approximately 100mm (see graph below). Subsequent stripping back during terminating will remove the moisture
affected insulant.

It is therefore unnecessary to take costly special precautions when storing or installing Wrexham Wiring Cables and
the following important points should be noted:

1. Temporary seals are not required during storage.

2. Installed cable lengths do not require temporary seals pending the fitting of terminations.

3. Extra length should not be allowed on installed cables to allow for shortening back of moisture affected ends. This
is an unnecessary and wasteful practice.

4. Wrexham Mineral Insulated Cables are supplied with the ends unsealed. They should be cut to length and
terminated at both ends before insulation resistance tests are carried out. (See Installation Practice section
for details).

200

DEPTH OF PENETRATION (mm) 150

100

50

0 1234 56

Coil Diameter TIME EXPOSED (MONTHS)
available in either
500mm, 915mm or FAILURE TO SEAL CABLE ENDS PRIOR TO TESTING WILL
RESULT IN INCORRECT AND MISLEADING READINGS
1370mm

20

The unique composition of our cable can withstand temperatures in excess of 1000°C and still operate safely
at its rated voltage.

This impressive performance can add vital time to escape a fire and makes it ideal for use in large developments such
as hospitals, shopping centres, airports, schools, underground rail systems and factories which house large numbers
of people.

Standard Conductor Cable

TECHNICAL ACCESSORIES

VOLT
DROP
CORE CONDUCTORS CURRENT RATINGS CABLE DIAMETER APPROX WEIGHT GLAND SIZE CABLE FIXINGS
CABLE SIZEN0 X SQ MM PER 1000 METERS REF: RGM
REFERENCE ONE HOLE CLIPS TWO WAY SADDLES
SHEATH CROSS SECTION
AREA (EFFECTIVE mm²)
EARTH FAULT LOOP
IMPEDANCE @ 70⁰C (R1
+R2) 0hms / KM
MAXIMUM CONDUCTOR
RESISTANCE 0hms PER
1000 METERS 20⁰C
CABLES EXPOSED TO TOUCH

BARE COVERED PER BARE LSZH LZSH PLAIN EARTH BARE LZSH BARE LZSH
(AMPS) (AMPS) AMP/ (mm) SEAL TAIL SEAL COPPER COATED COPPER COATED
PER COVERED BARE (KG) COVERED (mm) REF: RC REF: RCHL REF: RS REF: RSFL
METRE REF: RPS (mm)
(KGmm (KG) REF: RPSL
mV

LIGHT DUTY CABLE (500 volts)

2L 1.0 2 1.0 16.5 18.5 42 5.4 26.590 18.1 5.1 6.6 105 124 20 20 20 26 202 272

2L 1.5 2 1.5 20.5 23 28 6.3 18.627 12.1 5.7 7.2 132 156 20 20 22 28 222 302

2L 2.5 2 2.5 28 31 17 8.2 11.980 7.41 6.6 8.1 184 207 20 20 26 32 272 342

2L 4.0 2 4.0 36 40 10 10.7 7.915 4.61 7.7 9.4 253 290 20 20 30 37 302 382

3L 1.0 3 1.0 13.5 15 36 6.7 25.637 18.1 5.8 7.3 132 159 20 20 22 28 242 302

3L 1.5 3 1.5 17 19 24 7.8 17.823 12.1 6.4 7.9 172 199 20 20 24 30 272 342

3L 2.5 3 2.5 23.5 26 14 9.5 11.621 7.41 7.3 9.0 234 270 20 20 28 34 302 342

4L 1.0 4 1.0 13.5 15 36 7.7 25.111 18.1 6.3 7.8 164 191 20 20 24 30 272 342

4L 1.5 4 1.5 17.5 19.5 24 9.1 17.416 12.1 7.0 8.5 209 243 20 20 28 34 302 342

4L 2.5 4 2.5 23.5 26 14 11.3 11.166 7.41 8.1 9.8 288 333 20 20 32 37 342 422

7L 1.0 7 1.0 9 10 42 10.2 24.333 18.1 7.6 9.3 237 271 25 25 30 37 302 382

7L 1.5 7 1.5 11.5 13 28 11.8 16.758 12.1 8.4 10.1 310 351 25 25 32 40 342 422

7L 2.5 7 2.5 15.5 17.5 17 15.4 10.580 7.41 9.7 11.4 433 475 25 25 37 43 382 462

Solid Copper Conductors 1
Magnesium Oxide Insulation (MgO) 2

Solid Copper Sheath 3
LSZH Outer Sheath (optional) 4

Cable & Accessory Selection

TECHNICAL ACCESSORIES

VOLT
DROP
CORE CONDUCTORS CURRENT RATINGS CABLE DIAMETER APPROX WEIGHT GLAND SIZE CABLE FIXINGS
CABLE SIZEN0 X SQ MM PER 1000 METERS REF: RGM
REFERENCE ONE HOLE CLIPS TWO WAY SADDLES
SHEATH CROSS SECTION
AREA (EFFECTIVE mm²)
EARTH FAULT LOOP
IMPEDANCE @ 70⁰C (R1
+R2) 0hms / KM
MAXIMUM CONDUCTOR
RESISTANCE 0hms PER
1000 METERS 20⁰C
CABLES EXPOSED TO TOUCH

BARE COVERED PER BARE LSZH BARE (KG) LZSH PLAIN EARTH BARE LZSH BARE LZSH
(AMPS) (AMPS) AMP/ (mm) COVERED COVERED SEAL (mm) TAIL SEAL COPPER COATED COPPER COATED
PER (KGmm REF: RC REF: RCHL REF: RS REF: RSFL
METRE (KG) REF: RPS (mm)
REF: RPSL
mV

HEAVY DUTY CABLE (750 volts)

1 H6 1 6 47 52 6 8 5.318 3.08 6.4 7.9 173 213 20 20 24 30 272 342

1 H10 1 10 63 70 3.6 9 3.545 1.83 7.3 9.0 241 274 20 25 28 34 302 342

1 H16 1 16 83 92 2.3 12 2.471 1.15 8.3 10.0 327 364 20 25 32 37 342 422

1 H25 1 25 108 120 1.45 15 1.715 0.727 9.6 11.3 458 500 20 32 37 43 382 462

1 H35 1 35 132 147 1.05 18 1.329 0.524 10.7 12.4 600 650 20 32 40 47 422 502

1 H50 1 50 163 181 0.79 22 1.040 0.387 12.1 13.8 760 812 25 40 47 54 502 542

1 H70 1 70 199 221 0.55 27 0.781 0.268 13.7 15.4 1019 1080 25 - 54 59 542 632

1 H95 1 95 237.5 264 0.41 32 0.619 0.193 15.4 17.7 1326 1416 25 - 59 67 632 702

1 H120 1 120 272.5 303 0.33 37 0.516 0.153 16.8 19.1 1615 1713 32 - 63 75 702 752

1 H150 1 150 311 346 0.29 44 0.435 0.124 18.4 20.7 1952 2059 32 - 71 79 752 812

1 H185 1 185 353 392 0.25 54 0.368 0.101 20.4 23.2 2425 2570 32 - 79 88 812 932

1 H240 1 240 411 457 0.21 70 0.297 0.0775 23.3 26.1 3146 3312 40 - 88 101 932 1042

2 H1.5 2 1.5 22.5 25 28 11 16.902 12.1 7.9 9.6 247 284 20 20 30 37 342 382

2 H2.5 2 2.5 30.5 34 17 13 10.903 7.41 8.7 10.4 280 335 20 20 34 40 342 422

2 H4 2 4 40.5 45 10 16 7.185 4.61 9.8 11.5 365 415 20 25 37 43 422 462

2 H6 2 6 51 57 7 18 5.073 3.08 10.9 12.6 463 510 20 25 43 47 462 502

2 H10 2 10 69 77 4.2 24 3.272 1.83 12.7 14.4 653 725 25 32 47 54 502 592

2 H16 2 16 92 102 2.6 30 2.220 1.15 14.7 16.4 855 918 25 40 54 63 592 702

2 H25 2 25 119.5 133 1.65 38 1.531 0.727 17.1 19.4 1185 1285 32 40 67 75 702 752

3 H1.5 3 1.5 19 21 24 12 16.722 12.1 8.3 10.0 265 310 20 20 32 37 342 422

3 H2.5 3 2.5 25 28 14 14 10.711 7.41 9.3 11.0 345 390 20 25 37 43 382 462

3 H4 3 4 33 37 9.1 17 7.041 4.61 10.4 12.1 452 495 20 25 40 47 422 502

3 H6 3 6 43 48 6 20 4.953 3.08 11.5 13.2 562 602 25 25 43 51 462 542

3 H10 3 10 58.5 65 3.6 27 3.147 1.83 13.6 15.3 758 817 25 32 54 59 542 632

3 H16 3 16 77 86 2.3 34 2.133 1.15 15.6 17.9 1039 1130 25 40 59 71 632 752

3 H25 3 25 101 112 1.45 42 1.476 0.727 18.2 20.5 1451 1557 40 40 71 79 752 812

4 H1.5 4 1.5 19 21 24 14 16.435 12.1 9.1 10.8 330 370 20 20 37 43 382 462

4 H2.5 4 2.5 25 28 14 16 10.496 7.41 10.1 11.8 412 445 20 25 40 47 422 462

4 H4 4 4 33 37 9.1 20 6.814 4.61 11.4 13.1 530 608 25 25 43 51 462 542

4 H6 4 6 43 48 6 24 4.782 3.08 12.7 14.4 740 790 25 32 47 54 502 592

4 H10 4 10 58.5 65 3.6 30 3.036 1.83 14.8 16.5 916 979 25 32 54 63 592 702

4 H16 4 16 77 86 2.3 39 2.026 1.15 17.3 19.6 1292 1393 32 40 67 75 702 752

4 H25 4 25 101 112 1.45 49 1.384 0.727 20.1 22.9 1813 1956 40 40 79 88 812 932

7 H1.5 7 1.5 13 14.5 28 18 16.004 12.1 10.8 12.5 435 482 25 25 43 47 462 502

7 H2.5 7 2.5 17.5 19.5 17 22 10.100 7.41 12.1 13.8 563 616 25 25 47 54 502 542

12 H1.5 12 1.5 10.5 12 28 29 15.519 12.1 14.1 15.8 710 770 32 - 54 59 592 632

12 H2.5 12 2.5 14.5 16 17 34 9.706 7.41 15.6 17.9 910 1001 32 - 59 71 632 752

19 H1.5 19 1.5 9 10 28 37 15.310 12.1 16.6 18.9 989 1086 40 - 63 71 702 752

22
Twisted Conductor Cable

2 Core
3 Core
4 Core

Cable & Accessory Selection

Twisted Conductor Cable

CABLE SIZE CONDUCTORS CONDUCTOR SHEATH CAP-C/C CAP-C/SH IND-LOOP CHARACTER DIAMETER DIAMETER COND FREQUENCY
REFERENCE RESISTANCE RESISTANCE @10k-Hz @10kHz @10kHz IMP OVER SHEATH OVER LSZH AREA OF TWIST
1.0mm²
LSZH 2T1 2 18.1 3.2 144 219 443 55 5.1mm 6.6mm 1.5mm² (PER METRE)
LSZH 2T1.5 2 ohms/Km ohms/Km pF/m pF/m uH/Km ohms 5.7mm 7.2mm 2.5mm² 20
LSZH 2T2.5 2 6.6mm 8.1mm 1.5mm²
LSZH 3T1.5 3 12.1 2.7 164 243 436 52 6.4mm 7.9mm 1.5mm² 20
LSZH 4T1.5 4 ohms/Km ohms/Km pF/m pF/m uH/Km ohms 7.0mm 8.5mm
20
7.4 2.3 170 270 410 49
ohms/Km ohms/Km pF/m pF/m uH/Km ohms 20

12.1 2.2 160 260 450 50 20
ohms/Km ohms/Km pF/m pF/m uH/Km ohms

12.1 1.9 180-216 290 520 48
ohms/Km ohms/Km pF/m pF/m uH/Km ohms

Our Twisted Conductor Cables are designed for use where enhanced fire survival is required such as fire alarm and
detection systems.

Other applications include fire telephone systems, CCTV and public address systems. Our Twisted Conductor Cables
have reduced electromagnetic interference and signal corruption, reducing system malfunction and improved
electrostatic screening.

Reduced
electromagnetic
interference and
signal corruption

24

Accessories Our cable fixings are fire rated
and meet the requirements
of BS76771 fire resitant cable
fixings in escape routes.

To complement the cable, Fixing Clips & Saddles Brass Glands
Wrexham Mineral Cable
has developed a range of A full range of clips and saddles is available ATEX certified brass compression glands
accessories and tools, and in colours Bare Copper, Red, Orange, Black, for EExd and general applications.
can therefore supply a
complete wiring system to suit White. Other colours available on request. Sizes: 20mm, 25mm, 32mm, 40mm.
the requirements of a wide
variety of installations and PRODUCT CODE: WRCHL (clips) PRODUCT CODE: WRGM + cable size in mm
applications where only MICC PRODUCT CODE: WRSFL (saddles)
cables are suitable.
Seal Kit Copper Fixing Strap
Earth Tail kit

Termination seals with built in earth tail Termination seals without built in earth tail. For use when making your own special size

for easy use. Kit comproses E/T pots, RMX Kit comprises Seal pots, RMX sealing com- cable groupings. All colours available.

sealing compound, Stub caps, Conductor pound, Stub caps, Conductor sleeving. Size: 12mm, 18mm.

and earth sleeving. Sizes: 20, 25, 32, 40mm Sizes: 20mm, 25mm, 32mm, 40mm. PRODUCT CODE: WRSZL RSHL (covered)

PRODUCT CODE: WRPSL PRODUCT CODE: WRPS PRODUCT CODE: WRSZ RSH (bare strap)

Gland Shrouds Brass Locknuts Serrated Washers

Zero halogen shroud available in all For use with the RGM glands to secure the For use with the installation of the gland.
Sizes: 20mm, 25mm, 32mm, 40mm.
standard colours with special colours gland to the power supply box.
PRODUCT CODE: WRLWS
available on request. Sizes: 20mm, 25mm, Sizes: 20mm, 25mm, 32mm, 40mm.

32mm, 40mm. PRODUCT CODE: WRLM

PRODUCT CODE: WRHGMM - (LSZH), RHG

- (PVC) Available in 20mm & 25mm only

Accessories & Tools

Tools Bending Lever Rotary Stripper

Plate Type Crimper

Uses a 3 point crimping plate to lock the To assist in the dressing of cables or when Strips cables sheaths
stub cap into the pot. using the larger cables. The bending lever
will help save time. PRODUCT CODE: WZSUS (<8mm dia. cable)
PRODUCT CODE: WZDD + 20mm, 25mm, WZSU (>8mm dia. cable)
32mm, 40mm PRODUCT CODE: WZBLA (cables 10-16mm) SPARE BLADES: WZSUSB (pack of 5)
WZBLB (cables 16-27mm) WZSUB (pack of 5)

Joistripper Ringing Tool Wrench

Easy to set tool for fast and efficient Used to score a light groove around the Quick and easy ratchet tool for screwing on
stripping of: 2L1, 2L1.5, 2L2.5, 3L1, 3L1.5, cable sheath to neatly stop the stripping 20mm brass pots to the cable.
4L1, 4L1.5 action.
PRODUCT CODE: WZRP (20mm pots only)
PRODUCT CODE: WZSJ PRODUCT CODE: WZR
SPARE BLADES: WZSJB (sold individually)

Hand Crimper Pot Wrench

Fopooulnerraf+tuso4ero4thcls(ae0alr)l1noin9duf7orc8rosma8ml1aep0tsoi7otn8nee9aonmnts

A quick and easy tool for crimping the stub Tool ensures quick and accurate screwing

caps into the pots. The ‘T’ bar avoids the on of the brass pot. Sizes: 20mm, 25mm,

need for spanners. 32mm, 40mm.

PRODUCT CODE: WZDC20 PRODUCT CODE: WZPM + Pot Size in mm

26

Bending Preparation for stripping

All normal bending may be carried out without the use of Cutting the Cable to Length
tools, however, two sizes of bending levers are available The cable should be cut squarely to the length required
for use with the larger diameter cables or when multiple allowing for the appropriate length of conductor tails
bends are required - WZBLA (small) and WZBLB (large). (Fig. 4).
These levers are specially designed to prevent cable
damage during bending (see Fig. 3). Fig. 4

Fig. 3

The bending radius is normally recommended to For Cables with WLSZH Coverings
be limited to six times the diameter of the bare
copper cable, which permits further straightening When a gland shroud is to be used, cut the cable end
and re-bending if required. If more severe bends are square, and then offer up the shroud to the cable end in
unavoidable, they should be limited to a minimum reverse to determine the amount to be cut off, to ensure
bending radius of three times the bare cable diameter, a tight fit over the outer WLSZH covering (Fig. 5).
and any further straightening and bending must be done
with care to avoid damage to the cable. Fig. 5

When offsetting the cable to enter an enclosure via a
gland, 25 - 50mm of straight cable should be left between
the gland and the final bend to facilitate withdrawal of
the gland from the enclosure.

Spacing of fixings

As a general guide, horizontal fixings should be spaced at It will be necessary to remove an appropriate length of
not more than 100 times the cable diameter which may the outer covering prior to stripping the copper sheath.
be increased by 50% for vertical runs. The following table Mark the covering to the required tail length, plus an
is given for guidance: additional amount as indicated in the table.

OVERALL DIAMETER MAX. SPACING OF FIXINGS Gland Size 20 25 32 40
OF CABLE FOR MI CABLE

mm HORIZONTAL VERTICAL Length of tail
plus
Not exceeding 9 mm mm 70mm 70mm 80mm 90mm
Exceeding 9 and not
exceeding 15 600 800
Exceeding 15 and not
exceeding 20 900 1200 It is important when removing the WLSZH covering with a
Exceeding 20 and not knife, not to nick the under-lying copper sheath (Fig. 6).
exceeding 40
1500 2000

2000 3000

Installation Practice

Fig. 6 The small Rotary Stripper reference WZSUS is suitable
for use on cables up to 8.00mm diameter. The tool has
a fixed v block and is adjusted by means or the knurled
screw. The large Rotary Stripper WZSU is illustrated here,
the operations are identical for the small Rotary Stripper
WZSUS. Spare blades for these tools are available, Ref.
WZSUB or WZSUSB.

Fig. 8 Fig. 9

Hold the knife blade flat on the sheath so that the edge
does not cut into the copper (Fig. 7). Then mark and strip
the copper as follows:

Fig. 7

Having previously marked the sheath at the point
stripping is to stop (point A Fig. 10), add a second pencil
mark one tool width further along the sheath to indicate
stop position and location of pliers (point B, Fig. 10).

Stripping the Cable Sheath Fig. 10 BA

The sheath and insulant should be stripped back to
expose the conductors using one of the methods
described later. Allow for the required length of tail, plus
the measurement indicated below according to the size
of seal being fitted.

Pot Size 20 25 32 40 Insert the cable into the tool as far as the face of the
cutting wheel (Fig. 11). Tighten knurled screw until
Length of tail 11mm 17mm 20mm 25mm the tool can just support its own weight in a horizontal
plus position. Slightly release screw until tool can just fall
under its own weight and finger tighten locknut. (No
Using the Large and Small Rotary Strippers locknut is fitted to the small Rotary Stripper).
(WZSU & WZSUS)
Fig. 11
The large Rotary Stripper reference WZSU will
accommodate all sizes of cable by adjustment of the
knurled screw and locknut. The small ‘V’ of the reversible
block will accommodate cables up to 8·5mm diameter,
for cable above this size the larger ‘V’ must be used.

Positioning of the appropriate ‘V’ is achieved by
unscrewing the retaining screw, reversing the block
(ensuring that the chamfered edge is on opposite side to
cutting wheel) and then retightening the retaining screw
(see Fig. 8 and Fig. 9).

28

Rotate tool in a clockwise direction applying slight Fig. 12 Fig. 13
pressure in the direction of stripping until sufficient Fig. 14
swarf has been formed, to allow it to be bent round the
adjacent post, (Fig. 12 and Fig. 13). This will prevent the
tool snagging on the swarf and swarf coils from damaging
the exposed conductors. When making long tails it is
advisable to cut off the surplus swarf as the stripping
proceeds.

Continue turning the tool which will feed itself along the
cable. When sufficient sheath has been stripped
the operation is terminated by gripping the cable with
pliers at the point marked B and allowing the tool
to rotate against the jaws (Fig. 14). Remove the tool.

After removal of any remaining insulant from the
conductors, the cable is now ready for sealing.

Note:

1. The strippers will not self feed satisfactorily if:
a. The cable is flattened or distorted
b. The blade is not free to rotate or is blunt or chipped

Using the Joistripper Tool Ref WZSJ

The Joistripper is the sheath stripping tool specially The block can then be rotated to align the appropriate
recommended for 2L1, 2L1·5, 2L2.5, 3L1, 3L1·5, 4L1 and cable guide hole with the cutting blade and then engage
4L1·5 light duty Wrexham Cables. It is quick and easy to the locating pin. Finger pressure only to be used. Do not
use, taking off more sheath per revolution than any other force the guide block by tightening the retaining screw.
tool of its type (Fig. 15). Ensure no dirt is blocking the locating hole. Then tighten
the retaining screw and the tool is ready for use. Do not
Fig. 15 adjust the blade.

Retaining screws Changing the blade

Unscrew the retaining screws (Fig. 15) holding the
clamping plate and remove blade. Ensure cleanliness of
the slot before inserting replacement blade. Slide blade
down the slot until it rests against the face of the guide
block, whilst still lying flat in the slot.

The tool has a robust steel guide block which is easily Replace and secure clamping plate, tighten the two
positioned to accommodate the different cable sizes. retaining screws without undue force. The blade is
sharpened at both ends so that a spare cutting edge is
Setting the guide block available.

Unscrew the guide block retaining screw in the back of Note:
the guide block, in order to clear the block from the
locating pin in the handle assembly. The Joistripper will not self-feed along the cable if:

a. The cable is flattened or bent
b. The blade is chipped or blunt
c. The cable guide hole diameter is reduced by copper

accumulated from the cable sheath. This can be
avoided by periodic cleaning with a rag dipped in
solvent. e.g. white spirit

Installation Practice

Pencil mark the sheath at the point where stripping is to Position the pot into gland body and screw into tool (Fig.
stop, point A. Add a second pencil mark one tool width 18). Finger tightness is not sufficient. The assembly must
further along the sheath to indicate stop position and be lightly nipped up using pliers or a spanner.
location of pliers, point B. Place the tool over the end of
the cable and with a slight initial forward pressure, rotate Fig. 18
the tool (Fig. 16).

Fig. 16 B A

The tool will feed itself along the cable ~ removing the Slide the WZPM Pot Wrench onto the cable, turning it in
sheath in a continuous spiral. If the tool does not feed a clockwise direction while applying sufficient forward
itself due to minor distortion of the cable, a continuous pressure to engage internal screw thread of the pot onto
slight forward pressure to assist the feed will enable the the cable sheath.
stripping to be carried out. When making long tails it is
advisable to cut off the surplus swarf as the stripping Continue rotating the tool until the sheath is level with
proceeds. the shoulder inside the pot (Fig. 19).

When sufficient sheath has been removed, the operation Fig. 19
is terminated, by gripping the cable with pliers at point
B allowing the tool to rotate against the jaws (Fig. 17).
Remove the tool and any remaining insulant from the
conductors, The cable is now ready for sealing.

Fig. 17

In the case of the Increased Safety Seal, it is necessary
to screw the pot onto the sheath until 2mm of cable
protrudes beyond the shoulder inside the pot (Fig. 20).
With the small diameter cables it is advisable to grip the
cable sheath with pliers just behind the gland to prevent
twisting of the cable.

Fig. 20

Using the WZPM Pot Wrench

Recommended for all types of seal when using externally
threaded RGM glands, available for all four gland sizes.

If the sheath stripping operation has left any roughness
around the end of the sheath, this can be removed by
lightly running pliers around the cable end, ensuring that
no resultant metal particles adhere to the insulant.

Place gland shroud (if required), gland nut and
compression ring on stripped end of cable.

30

Do not reverse the screwing motion whilst fitting the pot, Fig. 21
as this can cause slackness of the pot, which can affect
sealing performance. When using earth tail seals the “Ommmmveiaae“ltlOttnnrrioooeuuv1nsddffe3aaraao5mccttf1ttmeeeuu3M””ti5rrrlIeeleCiddosCn
earth continuity may also be adversely affected. When
fitting an earth tail pot, the pot should be further turned
until the earth tail is midway between two conductors, to
ensure alignment with the cap or disc (Fig. 21). The fitting
operation may be assisted by applying a light smear of
petroleum jelly to the sheath. However, petroleum jelly
must not be used with Increased Safety Seals.

Remove the WZPM Pot Wrench from the gland body.
When unscrewing the WZPM Pot Wrench grip the
gland body with pliers or a spanner to prevent the pot
unscrewing from the sheath.

Taking care to avoid facial contact with the conductor
ends. Examine the pot interior and remove any metal
slivers or loose powder that may have resulted from the
screwing.

For Twelve and Nineteen Conductor Standard Seal

The conductor lengths should be staggered as follows: Fig. 22
Fig. 23
. Twelve core - shorten the nine outer conductors
by 10mm

. Nineteen Core - shorten the twelve outer conductors
by 20mm and the inner six conductors by 10mm
(Fig. 22)

Spread the outer conductors and keeping the thumb
between the wrapping and the compound to ensure
cleanliness, push the compound around the inner
conductors and down to the cable insulant (Fig. 23).

Pull the inner conductors straight using pliers. Reposition
the next layer of conductors and apply more compound
as necessary, before restraightening the conductors
by pulling gently with pliers. In the case of nineteen
conductor cables repeat the above repositioning, filling
and restraightening operations for the outermost layer of
conductors. Taking care to avoid cavities, slightly overfill
the pot. Care should be taken to avoid contamination of
the sealing compound.

Enter the conductors into the stub cap one at a time,
starting with the inner conductors and taking care to
achieve correct alignment. When all conductors have
been entered, push the cap into the pot recess with the
aid of a pair of pliers or other suitable tool. The seal is
now ready for crimping.

Installation Practice

Completing the Seals - Crimping the Pot Closure

Two types of crimping tool are available and are used as Fig. 24
follows: Fig. 25
Fig. 26
Plate Crimp Tool Ref. WZDD 20,25.32 40 (Fig. 24)

Fully unscrew the two screws, slide the crimping plate
over the conductors and up to the pot. Swivel the slotted
base up around the cable behind the pot and evenly
tighten the two screws, which will drive the stub cap or
disc fully into the pot recess and secure it in position by
means of three indent crimps. Unscrew the
screws and remove the tool.

Hand Crimp Tool Ref WZDC20 (Fig. 25)

Fully unscrew the drive screw by means of the handle.
Slide the conductors through the hole in the crimping
plate and through the hollow drive screw.

Place the pot into the seating in the brass body and
tighten the screw until it is fully hand tight which will drive
the stub cap or disc fully into the pot recess and secure
it in position by means of three indent crimps. Then
unscrew and remove the tool. When using stub caps cut
the conductor insulating sleeving to the required length
and slide it over the conductors and onto the stubs
(Fig. 26).

PTFE headed sleeves for the increased safety seal are
supplied in 100mm lengths as standard. Longer lengths
are available to special order.

Testing Fig. 27

Insulation testing should never be carried out on cables
which have unsealed ends because this will result in false
and misleading readings. Moisture in the atmosphere
can be recorded across the face of the exposed
magnesium oxide insulation resulting in false low
insulation resistance readings.

After both ends have been terminated with permanent
seals, the cable should be tested for insulation resistance
at a d.c. voltage appropriate to the intended operating
voltage, as per regulations. This initial test is to check for
major faults, (Short circuits within the seal pot) in which
case the fault can be located and rectified.

The insulation resistance reading should be noted and
compared with the value measured twenty-four hours
later. The insulation resistance should be at least 100
meg ohms and have risen from the initial test.

32

Projects

Wrexham Mineral Cables have provided true fire survival cable systems for many industries and businesses, exporting
to approximately 20 countries around the world including:

• Qatar • Indonesia
• Kuwait • Sri Lanka
• Saudi Arabia • Sudan
• Bahrain • USA
• Oman • Malaysia
• Australia • Canada
• United Arab Emirates • Thailand
• India • Hong Kong

Lusail City Multi Purpose Stadium

Building Includes: Field of Play, Warm up halls, Changing rooms,
Lounges, Medical center, Concourses, Spectator seating, VIP/VVIP
area, Ticketing offices, Food and Beverage service, Restaurants, Cafes,
Rentable spaces, Office spaces, Event & Competition supporting
facilities, Media and Broadcasting facilities, and Prayer rooms.

Projects & Special Products

Special Products

Wrexham Mineral Cables regularly train students and experienced contractors in terminating MICC cables either at
our factory or if suitable we can come to your site. We also issue a step by step training session on DVD.
Please enquire for more details on +44 (0)1978 810789.

34
Training

Wrexham Mineral Cables regularly train students and experienced contractors in terminating MICC cables either at
our factory or if suitable we can come to your site. We also issue a step by step training session on DVD.
Please enquire for more details on +44 (0)1978 810789.

www.w+re4x4h(0a)m19m7i8ne8r1a0l7c8a9bles.com

Middle East Approvals

Wrexham Mineral Cables Middle East Approvals

• Kuwait Oil Company (KOC)
• Qatar Civil Defence
• Qatar General Electricity & Water Corporation (Kahramaa)
• Dubai Civil Defence
• Saudi Arabian Electrical Company (SEC)

SUCTCOEASORSVOFUEURLNL2DY0 ETCXHOPEUOWNRTOTRIRNILEGDS

Wrexham Mineral Cables
Wynnstay Technology Park
Ruabon
Wrexham
LL14 6EN

Tel: +44 (0)1978 810789

sales@ wrexhammineralcables.com
www.wrexhammineralcables.com

WMC OO3/H