Electrician Red Seal · Question
An industrial facility is being upgraded, and an electrician needs to install a new circuit for a hazardous location identified as Class I, Division 2, Group C. The circuit will be a 240 V, 20 A branch circuit with copper conductors. What type of wiring method is explicitly permitted for this installation according to CEC Section 18 when installed with explosion-proof fittings?
CEC Rule 18-106(1) outlines permissible wiring methods for Class I, Division 2 locations. Among the listed options, Teck 90 armoured cable is explicitly permitt
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Question: An industrial facility is being upgraded, and an electrician needs to install a new circuit for a hazardous location identified as Class I, Division 2, Group C. The circuit will be a 240 V, 20 A branch circuit with copper conductors. What type of wiring method is explicitly permitted for this installation according to CEC Section 18 when installed with explosion-proof fittings?
Answer options:
- Rigid PVC conduit (RW90)
- Electrical metallic tubing (EMT) ✅ Teck 90 armoured cable
- Non-metallic sheathed cable (NMD90)
Correct answer: Teck 90 armoured cable
Explanation: CEC Rule 18-106(1) outlines permissible wiring methods for Class I, Division 2 locations. Among the listed options, Teck 90 armoured cable is explicitly permitted as per Rule 18-106(1)(e). Rigid PVC conduit is generally prohibited (Rule 18-004(1)), EMT is not permitted unless it also meets other specific criteria for Class I, Division 2 (Rules 18-104(2)(b) and (c) for Class I Div 1, not applicable for general Div 2), and NMD90 cable is not suitable for hazardous locations.
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