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Electrical wiring work
Specication of the protection tube
Name Temper grade Applicable conditions
Flexible PVC conduit PVC
When the protection tube is installed indoor and not exposed
to outside, because it is embedded in concrete structure
Class 1 exible conduit Galvanized steel sheet
When the protection tube is installed indoor but exposed to
outside so there are risk of damage to the protection tube
Class 1 PVC coated exible
conduit
Galvanized steel sheet and
Soft PVC compound
When the protection tube is installed outdoor and exposed to
outside so there are risk of damage to the protection tube and
extra waterproof is needed
Caution for perforating the knock-out hole
• Perforate a knock-out hole by punching it with a
hammer.
• After perforating the knock-out hole, apply rust
resisting paint around the hole.
• When you need to pass the cables through the knock-
out hole, remove burrs on the hole and protection the
cable with a protection tape or bushing etc.
Caution for installing communication cable
• When you connect the cable, it may sag and pressed by
other parts. Therefore cables should be xed to a clamp
highlighted with a box on the illustration.
CAUTION
Path for arranging external
communication cable
Fixing location of the
external communication
cable
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