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
metal enclosures of apparatus. All conduit ends shall be reamed to remove sharp
edges and threads shall be of sufficient length to enable conduits to butt within
couplings or to the stop end in box spouts. Draw-in boxes on straight runs shall be
provided at not more than 9000mm centers. Where right angle bends are formed
in the circuit, draw-in boxes shall be provided at not more than 7500mm centers
and not more than two right angled bends shall be employed in any one run.
Where conduit work is run external to the buildings a drain hole of 3mm diameter
shall be drilled in the bottom of switch boxes and other low points to drain
condensation. Conduits shall be fixed by means of spacing saddles on rough
concrete or brickwork. On fair faced brickwork or plaster spacer-bar saddles may
be used. Saddles shall be spaced at internals of not more than 1300mm on
straight runs and not more than 200mm on either side of a bend or junction box.
Fixings shall be made by means of galvanized steel wood screws of not less than
3mm diameter and 40mm in length, screwed into plastic or fibre insert plugs. All
lighting point boxes, switch boxes or socket outlet boxes shall be fixed by means
of two 8 gauge x 40mm steel screws.
2.02 PVC CONDUITS
A. All rigid PVC conduit and conduit fittings shall conform to British
Standard 4607 are to be certified as suitable for use at ambient
temperatures upto 55 Deg.C. Additionally, the material shall not soften or
suffer any structural degradation at a temperature of 85 Deg.C and shall be
non-hygroscopic and self extinguishing type.
All boxes and extension rings shall be fitted with brass inserts for the
securing screws and with an earth terminal. Conduit fittings and
accessories shall be of the same manufacture and shall be of the
unthreaded type.
The internal and external surfaces of conduits shall be smooth and free
from burrs and similar defects. The interior and ends of conduit fittings
shall be free of sharp edges and corners and shall be smooth and well
rounded to permit easy drawing in of cable and to prevent any damage to
cable insulation.
Boxes in ceiling for lighting/fans etc. shall be of GI type.