Electrician Red Seal · Question
A new disconnect switch is being installed for a 480 V, 3-phase motor. The visible blade type disconnect is rated for 60 A. What is the minimum clearance in front of the live parts of this disconnect switch, if it can be accessed from the front, according to CEC Table 1?
For equipment operating between 301 V and 750 V, CEC Table 1 requires a minimum clearance of 900 mm (3 ft.) in front of live parts where adequate working space
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Question: A new disconnect switch is being installed for a 480 V, 3-phase motor. The visible blade type disconnect is rated for 60 A. What is the minimum clearance in front of the live parts of this disconnect switch, if it can be accessed from the front, according to CEC Table 1?
Answer options:
- 750 mm (30 in.) ✅ 900 mm (3 ft.)
- 1000 mm (3 ft. 3 in.)
- 1200 mm (4 ft.)
Correct answer: 900 mm (3 ft.)
Explanation: For equipment operating between 301 V and 750 V, CEC Table 1 requires a minimum clearance of 900 mm (3 ft.) in front of live parts where adequate working space is needed for maintenance and operation.
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