The 7.5 m Tap Rule in 60 Seconds | CEC 2024 Rule 14-100

Описание: The 7.5 m tap rule (one-third rule), CEC 2024 Rule 14-100, Code Question of the Day #15 ⚡
A tap up to 7.5 m long needs an ampacity of at least ___ of the conductor it's tapped from.
A) 1/3
B) 1/4
C) 1/2
Comment your answer before the reveal 👇

Answer: A, one-third. Under the Rule 14-100 one-third tap item (paraphrased), a tap conductor not more than 7.5 m long can be smaller than the conductor it's tapped from, as long as its ampacity is at least 1/3 of that conductor, it's protected from mechanical damage, and it ends in a single overcurrent device (breaker or set of fuses) rated no higher than the tap's ampacity. Example: tap a 300 A feeder → tap ampacity at least 100 A, landing on a single device of 100 A or less. The separate short "3 m" tap rule has its own conditions — don't mix them up.

Alberta tip: if the tap is longer than 7.5 m, you're not in this exception — size and protect it properly.

Always check your own code book, local amendments, and your inspection authority. Paraphrased, not the code text. Not legal advice.
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