Electrician Red Seal · Question
A commercial building requires a new 300 kVA, 600 V primary to 208Y/120 V secondary transformer. The transformer will be installed indoors. What is the minimum clearance from the transformer enclosure to any unprotected combustible material, as per CEC?
CEC Rule 26-248(1)(a) requires that dry-type transformers, having a rating exceeding 50 kVA, installed indoors, shall be separated from combustible material by
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Question: A commercial building requires a new 300 kVA, 600 V primary to 208Y/120 V secondary transformer. The transformer will be installed indoors. What is the minimum clearance from the transformer enclosure to any unprotected combustible material, as per CEC?
Answer options:
- 150 mm (6 in.)
- 300 mm (12 in.) ✅ 600 mm (24 in.)
- No minimum clearance is specified if the transformer is dry-type.
Correct answer: 600 mm (24 in.)
Explanation: CEC Rule 26-248(1)(a) requires that dry-type transformers, having a rating exceeding 50 kVA, installed indoors, shall be separated from combustible material by a minimum distance of 600 mm.
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