Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
All boxes installed in exterior locations, plant rooms, ducts etc, shall be fitted with
approved type gaskets to provide a waterproof seal between box and Cover or
other item fitted to the box.
PART 3 – EXECUTION
3.01 PVC conduits and fittings shall be joined by using sealing cement (vinyl solvent
paint) to ensure a watertight joint. The cement shall be of a type that remains in a
sticky condition. When PVC conduits are embedded in concrete slabs, they shall
be securely held in place by fixing to shuttering and reinforcing bars. In walls,
they shall be run in cut chases and fixed by saddles or crumpets.
3.02 Chases shall be deep enough to allow full thickness of plaster cover to be applied.
Bends in PVC conduits shall be neatly made with a proper size bending spring.
3.03 Except when embedded in concrete slab, all conduits shall be installed parallel to
the lines of the building and at a minimum of 100mm away from pipes or other
non electrical services. Boxes shall be fixed independently to the building so as
not to be supported by the conduits. Empty conduits when left with ends exposed
for some time shall be closed with suitable plugs to prevent entry of dirt and
foreign matter.
3.04 Conduits shall be installed in such a manner to prevent trapped condensation. Pull
boxes shall be provided as required for easy drawing of wires and shall be in
readily accessible locations with covers fixed by brass screws.
3.05 No wire is to be drawn inside conduits until they are completely erected and
approved by the Engineer. The conduits shall be swabbed through to remove any
dirt or loose matter before drawing of wires.
3.06 The sizes of conduits shall be in accordance with the number and sizes of wires to
be drawn inside them as indicated in IEE or latest concerned local authorities
Regulations but no conduit smaller than 20mm. shall be used. A pull wire or tape
shall be provided in all empty conduits with no less than 200mm. of slack left at
each end.