Installation Instructions - Viscount Rotational Mouldings

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Installation Instructions
Viscounts Large Pits P5 / P6 / P7 / P8 / P9

Two defining stages of installation of pits:

(A) (B)
Original installation of pit in a new environment: Reinstatment Installation; replacement of damaged pit or
Specific stages are followed, including depth of install installation over an obstacle:
and height of entry points. Modifications need to be made post install, additional
No cabling is present, all conduits / piping are unused. cabling or catering for alterations in depth.
There are multiple methods for such alterations,
dependent on the specific circumstances.

Original Installation of P5, P6, P7, P8 & P9 Pits.
Prior to excavation.

Note: All excavations must comply with all relevant authorities and ensure correct OH&S procedures have been carried out
before commencement.

Find, recognize, uncover and pacify all underground material in the vicinity.

Excavate site to required size and depth. Where possible, excavate site larger then the pit to accommodate the persons
working area. The pit must sit in the hole and be level with ground surface and / or footpath as specified by the appropriate
authority. The excavated site also needs to allow for conduit to be installed at correct depth.

Creating entry / exit points for conduit.

All entry / exit points for conduit or piping should be
made on the flat surface below the ribs of the either ends
of the pit.

The top of the entry / exit points for the conduit must be
level with or below the minimum depth of cover required.
Example is 450mm for all street conduit and piping,
measured from the footpath for telecommunication work.

The bottom of the entry / exit points for the conduit
should be 50mm above the inside base of the pit to
avoid infiltration of silt into the pit.

Entry / exit points for conduit need to be made in centre
of end wall panel. If more than one point is required, point
must be dispersed evenly.

Entry / exit points at opposite ends of the pit should be
aligned in order for cabling to be pulled through easily,
then drill out using a hole saw of required size.

Viscount Rotational Mouldings

Installation Instructions
Viscounts Large Pits P5 / P6 / P7 / P8 / P9

Drilling out entry / exit points Put pit into excavation hole, aligning perimeter to
Entry / exit points required boundary. Generally the long side of the pit is
along the boundary .
For details on number and size of entry / exit points for pit Make required alterations to pit foundation in order to
please refer to the appropriate authority specifications. level out pit with ground surface level or pavement.

Preparing the pit’s foundation

All pits require a foundation of sand, refined crushed
rock, or stabilized sand of a depth of 100mm.

Bed the foundation appropriate for the application; the
foundation needs to bring the pit lip level with the ground
surface or pavement.

For the application of electrical cabling, a precast
concrete slab or approved
alternative protector covering the entire pit base area
must be installed below the foundation.

Installation of conduit into the pit

Install the conduit into ends of pits at required depth
of cover and above 50mm from base, fit all conduit /
piping with bushes. Currently no bushes are available for
150mm conduit.

Conduit / Piping must be cut square and flush to interior
wall of pit.

All burrs and rough edges must be cleaned off ends.

Choose and appropriate bush for the conduit.
The bush needs to be installed into the entry / exit hole
with the rounded edge flush with the interior pit
wall. Any cutting guides need to be allowed for with
sufficient space for them to be installed.

The bush is moulded with ridges, which lock the part into
place.

The conduit must be inserted fully into the bush and PVC
glued.

If the edges of the bush are not hard up against the pit,
they should be sealed using pre-mixed concrete on the
exterior wall of the pit around the bushes edges.

Installation Instructions
Viscounts Large Pits P5 / P6 / P7 / P8 / P9

Backfilling

Viscount Rotational Moulding’s pits are manufactured
with reinforcing ribs. These are design for strength and
grip.
The backfill material must contour to these ribs in order
to provide maximum strength and to maintain the pits
structural integrity. Backfill material should be; sand,
refined crushed rock or stabilized sand. During the
backfilling process, the walls of the pit should not be
warped.

When filling the excavation with backfill material, you
must abide by the appropriate authority specifications
and not overfill.

A correct method of backfilling will insure that there is not

collapsing of soil post installation. Begin backfilling excavated hole that surrounds pit.
Backfill needs to be hard-packed by non-mechanical
P6, P7, P8 and P9 Pits came with two PVC cable hand operated compactor. Compaction should take
bearers, fitted into the interior of the pit. place in layers, 150mm in depth or under. This process
should be used to fill entire excavation until level to
Note, both cable bearers must be replaced before any ground surface or pavement level. Or alternatively to
gaskets and pit lids are installed. allow for laying of pavement, which requires backfill
material to be levelled and clean to the pits edges.
INSTALL CROSS BARS, GASKETS AND PIT LIDS INTO
POSITION BEFORE COMMENCEMENT OF BACKFILL, Viscount Rotational Mouldings
TO EXCLUDE BACKFILL MATERIAL FROM POLLUTING
THE PIT.

Classification Classes
Viscounts Large Pits P5 / P6 / P7 / P8 / P9

Viscount Rotational Mouldings provides Lids of three classification classes; A, B & C. Refer to below
table for class, type of use and load bearing.

Class Type of use Nominal wheel Serviceability Ultermate limit
load Kg deign load kN state design load
kN

A Footpaths and areas only accessible 330 6.7 10
by pedestrian and cyclist traffic
(Extra-light Duty) 2670 53 80

B Footpaths that may be mounted by 5000 100 150
a vehicle or livestock and light tractor
paths (Light Duty)

C Malls and pedestrian areas open to
slow moving commercial vehicles
(Medium Duty)