Electrician Red Seal · Question
An industrial electrician is installing a 3-phase, 480 V motor circuit using armoured cable (AC90). The cable passes through an area where it is exposed to potential mechanical damage. What is the minimum radius of the bend in the cable, measured to the inner edge, if the cable has an outside diameter of 30 mm?
Rule 12-608(1) of the CEC specifies that armoured cables (AC90) shall not be bent with a radius of the inner edge of the bend less than 8 times the outside diam
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Question: An industrial electrician is installing a 3-phase, 480 V motor circuit using armoured cable (AC90). The cable passes through an area where it is exposed to potential mechanical damage. What is the minimum radius of the bend in the cable, measured to the inner edge, if the cable has an outside diameter of 30 mm?
Answer options:
- 180 mm ✅ 240 mm
- 150 mm
- 120 mm
Correct answer: 240 mm
Explanation: Rule 12-608(1) of the CEC specifies that armoured cables (AC90) shall not be bent with a radius of the inner edge of the bend less than 8 times the outside diameter of the cable. For a cable with a 30 mm outside diameter, the minimum bend radius would be 8 * 30 mm = 240 mm.
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