Electrician Red Seal · Question
A #2 AWG copper conductor with RW90 insulation is used in a circuit. According to CEC Table 2, what is its allowable ampacity when in a raceway with up to 3 conductors, assuming a termination temperature of 75°C?
Although RW90 insulation is rated for 90°C, the conductor's ampacity is limited by the termination temperature of the equipment, which is typically 75°C for dev
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Question: A #2 AWG copper conductor with RW90 insulation is used in a circuit. According to CEC Table 2, what is its allowable ampacity when in a raceway with up to 3 conductors, assuming a termination temperature of 75°C?
Answer options:
- 95 A ✅ 115 A
- 130 A
- 175 A
Correct answer: 115 A
Explanation: Although RW90 insulation is rated for 90°C, the conductor's ampacity is limited by the termination temperature of the equipment, which is typically 75°C for devices over 100A (Rule 4-006). Therefore, you must use the 75°C column of Table 2, which gives an ampacity of 115 A for a #2 AWG copper conductor.
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