Electrician Red Seal · Question
A construction site requires temporary wiring for lighting and tool power for a period of six months. The site is outdoors and subject to varying weather conditions. Which wiring method and associated rules are most suitable, considering the temporary nature and outdoor environment, as per the Canadian Electrical Code (CEC)?
For temporary outdoor wiring on construction sites, extra-hard usage flexible cords (like SOW/SOOW) are permissible when properly supported and protected from d
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Question: A construction site requires temporary wiring for lighting and tool power for a period of six months. The site is outdoors and subject to varying weather conditions. Which wiring method and associated rules are most suitable, considering the temporary nature and outdoor environment, as per the Canadian Electrical Code (CEC)?
Answer options:
- Non-metallic sheathed cable (NMD90) secured directly to scaffolding
- Armoured cable (AC90) installed underground without additional protection ✅ Extra-hard usage flexible cord (e.g., SOW, SOOW) run overhead with strain relief
- Rigid PVC conduit (Schedule 40) surface-mounted without expansion fittings
Correct answer: Extra-hard usage flexible cord (e.g., SOW, SOOW) run overhead with strain relief
Explanation: For temporary outdoor wiring on construction sites, extra-hard usage flexible cords (like SOW/SOOW) are permissible when properly supported and protected from damage, as they are designed for harsh environments and possess the necessary flexibility for temporary setups (CEC Section 76). NMD90 and AC90 are generally not compliant for exposed outdoor temporary use. Underground AC90 needs additional protection. Schedule 40 PVC, while suitable for outdoor, still requires expansion fittings for long exposed runs and is less flexible for temporary installations.
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