Electrician Red Seal · Question
An electrician is running several control cables in a cable tray within an industrial plant. Some of these cables are inherently flame retardant (FT4 rated), and others are not rated for flame spread. According to the CEC, what is the maximum fill ratio for cables in a single cable tray, assuming the cables are all of the same cross-sectional area and the tray is ventilated?
CEC Rule 12-2210(1) states that for a ventilated cable tray containing control and communication cables where the sum of the cross-sectional area of the conduct
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Question: An electrician is running several control cables in a cable tray within an industrial plant. Some of these cables are inherently flame retardant (FT4 rated), and others are not rated for flame spread. According to the CEC, what is the maximum fill ratio for cables in a single cable tray, assuming the cables are all of the same cross-sectional area and the tray is ventilated?
Answer options:
- 20% of the tray's cross-sectional area
- 30% of the tray's cross-sectional area ✅ 40% of the tray's cross-sectional area
- 50% of the tray's cross-sectional area
Correct answer: 40% of the tray's cross-sectional area
Explanation: CEC Rule 12-2210(1) states that for a ventilated cable tray containing control and communication cables where the sum of the cross-sectional area of the conductors in cables is less than 1000 mm² (1.55 sq in), the total cross-sectional area of all cables shall not exceed 40% of the cross-sectional area of the cable tray.
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