Electrician Red Seal · Question
A homeowner wants to install a new hot tub rated at 40 A, 240 V, single-phase, outside on a concrete pad. The electrician plans to run NMD90 cable from the main service panel in the basement through the exterior wall to a disconnect switch located 2 meters (6.5 feet) from the hot tub. What is the minimum conductor size required for this installation according to CEC Rule 68-060, assuming copper conductors?
CEC Rule 68-060(1)(a) requires that conductors supplying a pool, tub, or spa shall be copper of an ampacity not less than 125% of the rating of the branch circu
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Question: A homeowner wants to install a new hot tub rated at 40 A, 240 V, single-phase, outside on a concrete pad. The electrician plans to run NMD90 cable from the main service panel in the basement through the exterior wall to a disconnect switch located 2 meters (6.5 feet) from the hot tub. What is the minimum conductor size required for this installation according to CEC Rule 68-060, assuming copper conductors?
Answer options:
- #10 AWG
- #8 AWG ✅ #6 AWG
- #4 AWG
Correct answer: #6 AWG
Explanation: CEC Rule 68-060(1)(a) requires that conductors supplying a pool, tub, or spa shall be copper of an ampacity not less than 125% of the rating of the branch circuit. For a 40 A load, 40 A × 1.25 = 50 A. From CEC Table 2, #6 AWG copper conductors with NMD90 insulation have an ampacity of 65 A, which is suitable. #8 AWG only has an ampacity of 50 A, which is not greater than 125% of the load.
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