October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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PVC-sheathed wiring 139
TWIN-AND-EARTH
P.V.C-SHEATHED CABLE
3 TO NEXT LIGHTING POINT
EARTH TERMINAL
RUBBER
BUSH
.EARTH TERMINAL
-SLEEVED PROTECTIVE CONDUCTOR
-S.P.
SWITCH
BOX
BLACK CORES
RED CORES
GREEN/YELLOW
SLEEVE
Fig.
9.5. Use of junction boxes in an all-insulated looped lighting circuit
Where cables pass through structural steelwork, the holes must be fitted
with suitable bushes to prevent abrasion of the cables.
Fig. 9.4 shows the cabling of a lighting circuit using 4-terminal ceiling
roses,
and Fig. 9.5 shows the equivalent arrangement using junction boxes.
For more information see Chapters 4 and 5.
Installation hints
When pulling PVC-sheathe ...
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