Cable Bus Engineering Guide

ENGINEERING GUIDE

CABLE BUS

ENGINEERED TO OUTPERFORM

ESTABLISHED IN 1955

INTRODUCTION

For over 60 years, MP HUSKY Cable Bus Systems have been engineered and manufactured for superior reliability. We utilize
less conductive material to provide significant savings versus non-segregated phase duct, conduit and wire, and other
electrical feeders. As copper prices have continued to remain at historically high levels, the savings clients realize are even
greater and more important. No matter how you look at it, MP HUSKY Cable Bus outperforms other electrical busways in
reliability, cost, and flexibility. See for yourself why more owners, engineers, and buyers choose MP HUSKY cable bus systems
over the competition.

MOST RELIABLE LOWEST COST MOST FLEXIBLE MAINTENANCE FREE

CROSS SECTIONS

ENGINEERED TO OUTPERFORM

System Operating No. of Conductors Height (H) Nominal (W1) Overall (W2) Weight (Lbs/Ft)
Ampaciy Temperature per Phase
15
600V 3PHASE/3WIRE SYSTEM 800A 75°C 2-500 MCM 8” 12” 15.5” 12
90°C 1-750 MCM 6” 12” 15.5” 20
15
1200A 75°C 2-750 MCM 8” 12” 15.5” 22
90°C 2-500 MCM 8” 12” 15.5” 20
26
1600A 75°C 3-500 MCM 8” 12” 15.5” 26
90°C 2-750 MCM 8” 12” 15.5” 36
26
2000A 75°C 4-500 MCM 8” 18” 21.5” 44
90°C 4-500 MCM 8” 18” 21.5” 36
60
2500A 75°C 4-750 MCM 8” 18” 21.5” 52
90°C 4-500 MCM 8” 18” 21.5” 76
68
3000A 75°C 5-750 MCM 10” 18” 21.5” 84
90°C 4-750 MCM 8” 18” 21.5” 76

4000A 75°C 7-750 MCM 10” 20” 23.5”
90°C 6-750 MCM 10” 18” 21.5”

5000A 75°C 9-750 MCM 10” 24” 27.5”
90°C 8-750 MCM 10” 24” 27.5”

6000A 75°C 10-750 MCM 10” 26” 29.5”
90°C 9-750 MCM 10” 24” 27.5”

NOTE: The above system sizes represent typical arrangements. For your custom applications please consult MP Husky’s engineering department.

System Operating Temperature No. Of Conductors Per Height (H) Nominal (W1) Overall (W2) Weight (Lbs/Ft)
Ampaciy Phase
18
600V 3PHASE/4WIRE SYSTEM 800A 75°C 2-500 MCM 8” 12” 15.5” 16
90°C 1-750 MCM 6” 12” 15.5” 26
18
1200A 75°C 2-750 MCM 8” 12” 15.5” 26
90°C 2-500 MCM 8” 12” 15.5” 26
33
1600A 75°C 3-500 MCM 8” 18” 21.5” 26
90°C 2-750 MCM 8” 12” 15.5” 47
33
2000A 75°C 4-500 MCM 8” 18” 21.5” 58
90°C 4-500 MCM 8” 18” 21.5” 47
79
2500A 75°C 4-750 MCM 8” 20” 23.5” 68
90°C 4-500 MCM 8” 18” 21.5” 100
90
3000A 75°C 5-750 MCM 10” 18” 21.5” 108
90°C 4-750 MCM 8” 24” 27.5” 100

4000A 75°C 7-750 MCM 12” 20” 23.5”
90°C 6-750 MCM 10” 24” 27.5”

5000A 75°C 9-750 MCM 12” 24” 27.5”
90°C 8-750 MCM 12” 24” 27.5”

6000A 75°C 10-750 MCM 12” 26” 29.5”
90°C 9-750 MCM 12” 24” 27.5”

NOTE: The above system sizes represent typical arrangements. For your custom applications please consult MP Husky’s engineering department.

CROSS SECTIONS

5KV 3PHASE/3WIRE System Operating No. of Conductors Height (H) Nominal (W1) Overall (W2) Weight (Lbs/Ft)
Ampaciy Temperature per Phase
24
800A 90°C 1-750 MCM 6” 12” 15.5” 22
24
1200A 90°C 2-500 MCM 8” 12” 15.5” 33
33
1600A 90°C 2-750 MCM 8” 12” 15.5” 42
64
2000A 90°C 3-500 MCM 8” 18” 21.5” 73
83
2500A 90°C 4-500 MCM 8” 18” 21.5”

3000A 90°C 4-750 MCM 8” 20” 23.5”

4000A 90°C 6-750 MCM 12” 20” 23.5”

5000A 90°C 7-750 MCM 12” 24” 27.5”

6000A 90°C 8-750 MCM 12” 26” 29.5”

NOTE: The above system sizes represent typical arrangements. For your custom applications please consult MP Husky’s engineering department.

35KV 3PHASE/3WIRE 15KV 3PHASE/3WIRE System Operating No. of Conductors Height (H) Nominal (W1) Overall (W2) Weight (Lbs/Ft)
Ampaciy Temperature per Phase
18
800A 90°C 1-750 MCM 6” 12” 15.5” 21
27
1200A 90°C 2-500 MCM 8” 12” 15.5” 38
38
1600A 90°C 2-750 MCM 10” 12” 15.5” 50
72
2000A 90°C 3-500 MCM 8” 24” 27.5” 82
92
2500A 90°C 4-500 MCM 8” 20” 23.5”

3000A 90°C 4-750 MCM 10” 24” 27.5”

4000A 90°C 6-750 MCM 12” 24” 27.5”

5000A 90°C 7-750 MCM 12” 26” 29.5”

6000A 90°C 8-750 MCM 12” 28” 31.5”

NOTE: The above system sizes represent typical arrangements. For your custom applications please consult MP Husky’s engineering department.

System Operating No. of Conductors Height (H) Nominal (W1) Overall (W2) Weight (Lbs/Ft)
Ampaciy Temperature per Phase
24
800A 90°C 1-750 MCM 6” 18” 21.5” 28
36
1200A 90°C 2-500 MCM 10” 12” 15.5” 39
48
1600A 90°C 2-750 MCM 10” 18” 21.5” 62
88
2000A 90°C 3-500 MCM 10” 24” 27.5”

2500A 90°C 4-500 MCM 10” 24” 27.5”

3000A 90°C 4-750 MCM 10” 26” 29.5”

4000A 90°C 6-750 MCM 12” 26” 29.5”

NOTE: The above system sizes represent typical arrangements. For your custom applications please consult MP Husky’s engineering department.

VERTICAL ELBOWS
VERTICAL OUTSIDE VERTICAL INSIDE

8” High Cable Bus 10” High Cable Bus 8” High Cable Bus 10” High Cable Bus

Nominal Inside Outside Nominal Inside Outside Nominal Inside Outside Nominal Inside Outside
Radius Radius Radius Radius Radius Radius Radius Radius Radius Radius Radius Radius

12” 11 3/4” 19 3/4” 12” 11 3/4” 21 3/4” 12” 11 3/4” 19 3/4” 12” 11 3/4” 21 3/4”

18” 18” 26” 18” 18” 28” 18” 18” 26” 18” 18” 28”

24” 22 1/2” 30 1/2” 24” 22 1/2” 32 1/2” 24” 22 1/2” 30 1/2” 24” 22 1/2” 32 1/2”

12” High Cable Bus 12” High Cable Bus

Nominal Inside Outside Nominal Inside Outside
Radius Radius Radius Radius Radius Radius

12” 9 3/4” 21 3/4” 12” 11 3/4” 23 3/4”

18” 16” 28” 18” 18” 30”

24” 20 1/2” 32 1/2” 24” 22 1/2” 34 1/2”

HORIZONTAL ELBOWS

Nominal W1 W2 RI RO
Radius
12” 15 1/2” 12” 24”
12” 18” 21 1/2” 12” 30”
20” 23 1/2” 12” 32”
18” 24” 27 1/2” 12” 36”
12” 15 1/2” 18” 30”
24” 18” 21 1/2” 18” 36”
20” 23 1/2” 18” 38”
24” 27 1/2” 18” 42”
12” 15 1/2” 24” 36”
18” 21 1/2” 24” 42”
20” 23 1/2” 24” 44”
24” 27 1/2” 24” 48”

Horizontal and vertical elbows can be manufactured in 15, 30, 45, 60, or 90 degrees. Radius of horizontal and vertical
elbows shall not be less than the minimum bend radius of cable. 3D models of elbows available upon request.

DESIGN REQUIREMENTS

In order for MP Husky to proceed with the design of your cable bus system, the following drawings and information need
to be submitted:
1. Drawings & submissions, special requirements – engineer will provide any special client title block data electronically to

MP Husky and MP Husky will add to the drawings.
2. Equipment layouts, plan and elevation, tied to coordinate points, column lines, or site survey lines.
3. Certified equipment drawings, showing location of termination points and available termination space, as follows:

TRANSFORMERS SWITCHGEARS BUILDINGS

• Plan and elevation DWGS with center • Plan and elevation outline • Plan and elevation outline DWGS with center
lines. DWGS with center lines. lines.

• Location of the bushing and throat • Side section DWGS showing • Outer wall location, construction details,
flange relative to the XMFR base and cable termination space. entry locations, and fire ratings.
center lines.
• Location of the bus bars • Dimensioned plan, elevation, and section
• Transformer height from the base to relative to the switchgear views showing bus entry locations.
top of cover mounted bushing. base and center lines.
• Room elevation above grade.
• Horizontal distance from XMFR center • Bus bar drilling pattern and • Equipment layouts referenced against
line to bushing center line of cover hole spacing.
mounted bushing. coordinate points, column lines, or site
• Location (e.g. bottom, top, survey grid.
• XMFR height from base to horizontal or side) and size of the entry • If cable bus entry is below, through the
center line of sidewall mounted into the switchgear. building floor, the following issues may
bushing. apply:
- Time rating of fire barriers.
• Horizontal distance from XMFR center - Floor construction details.
line to bushing extension of sidewall - Method for fire barrier
mounted bushing. - Mounting - directly to the underside of the

• Bushing drilling pattern and hole steel floor or a throat to which a barrier
spacing. can be attached.

ENGINEERING GUIDE

COMPONENTS

ENGINEERED TO OUTPERFORM

FIRESTOPS

MCT seals are used when a fire rated and watertight seal is required.
Neoprene modules are inserted after the cables are installed for ease
of pulling. They are UL listed for a 2 hour fire rating and come with all
necessary hardware.

TERMINATION BOXES

Transformer termination boxes, switchgear/MCC top hats, tap boxes
and other junction boxes designed and supplied by MP Husky
guarantee the needed space to properly transpose the phases and
terminate the conductors to the electrical equipment. Standard
termination boxes are aluminum welded angle frame construction
with bolted, removable side panels and welded fixed panels as needed.
Painted steel and stainless steel are also available. Outdoor boxes are
NEMA 4x and use gasketed removable panels, fully seam welded fixed
panels, and an ESF type seal to ensure a watertight enclosure.

INDOOR CONNECTION FLANGES

Indoor connection flanges are used to connect the cable bus housing
to indoor electrical equipment (switchgear, motor control center, etc.)

ENVIRONMENTAL SEAL FLANGES

These fittings form a seal with walls and can also be used for floor
penetrations that must be watertight. Conductors are sealed with
RTV silicone sealant. Entrance fittings are furnished with all necessary
hardware.

MP Husky’s Cable Bus Systems are certified to CSA C22.2 #27 (busways) and C22.2 #201
UL classified as an equipment ground.

mphusky.com

ABOUT OUR PRODUCTS

RELIABLE • Utilizes continuous TESTING &• Certified to
CCSA 22.2 #27
conductors. E(busways) and 22.2
• High quality factory
#201 (metal enclosed
insulated cables. high voltage busways).
• Cable support blocks will • UL classified as an
equipment ground.
not decay, rot, or lose • Heat rise tests on widest
structural integrity for range of system ratings.
50+ years. • Short circuit tests up to
120kA rms symmetrical.
• Heat rise test verifying in trench
applications.
• Load tests confirm structural
capability up to 20’ spans.
RTIFICATION ADAPTABLE
FLEXIBLE &
• Easily adjusted in the field to • Up to 40% less conductive RFLEXIBLE &
accomodate field changes. material is needed. RATING
• Easily routed around
• Minimal temperature rise due
unforeseen field obstruction. to ventilated enclosure.
• Extensive custom • Cable spacing by custom
support blocks.
fabrication capabilities. • Max ampacity in
• Engineered to meet accordance with
all of your difficult
ICEA listings for 90˚
ADAPTdAesiBgn cLhaEllenges. Celsius rated

FREE AI conductors.

TABLE

For more information or to request a quote,
visit our website at mphusky.com or call us at 864-234-4800.

ENGINEERING GUIDE