Tap Conductor Rules: The 10-ft and 25-ft Tap Rule
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Tap conductors leave their source with no overcurrent protection at that point — and the code allows that under two very specific rules, each with its own length, ampacity, and protection requirements.
In this lesson: what a tap conductor actually is, the 10-foot tap rule (the inside-the-switchboard vs leaving-the-enclosure distinction, the one-tenth ampacity rule, the sum-of-loads check), the 25-foot tap rule (one-third ampacity, physical protection, the single terminating breaker and its own ampacity ceiling), worked numeric examples for both, and why these two rules are not interchangeable.
