3.5Piping
*Where wiring is to be passed through a wall or the like, it should be protected by a hard PVC or metal tube.
*If the number of connecting wires between an indoor terminal board and a station is small and the station's site is fixed so that it will not be moved frequently, install a box at that site and pull wiring through a metal or hard PVC tube as required by job or ordinance.
*Use a floor duct if the number of connecting wires is large and the stations are likely to be moved frequently.
*Station wiring which must be laid across open areas of floor should be protected by plastic or metal shields. (See drawing below.)
EXAMPLE:
Wire protector
Floor duct
Floor
Metal or Hard PVC tube | Plastic or |
| |
| Aluminum |
Wall |
|
Wire protector |
|
| |
& Plug |
|
Box | Desk |
| |
| Station wiring |
| Floor |
Fig. 10
14