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EPISODE 11 — Number and Grouping of Disconnects 1kva (268.71, 268.72)
EPISODE 11 — Number and Grouping of Disconnects 1kva (268.71, 268.72)
Slide 1 — Hook "How many service disconnects can one service actually have — and how do multiple disconnects need to be arranged?"
Slide 2 — 268.71 Maximum number
General rule: ONE disconnect per service — unless 268.71(B) applies.
Single-pole switches/breakers operated individually are okay, but count together as ONE disconnecting means when used on a multipole circuit (one unit per phase).
NOT counted as a "service disconnect" for this rule: disconnects solely for power monitoring equipment, surge arresters, ground-fault protection control circuits, or power-operable service disconnect controls.
268.71(B): 2 to 6 service disconnects ARE allowed, in separate enclosures each with its own main disconnect, or in switchgear/transfer switch compartments each holding one disconnect.
Slide 3 — 268.72 Grouping
Those 2-6 disconnects must be GROUPED together, and each one marked to show what load it serves.
Exception: a fire-protection water pump disconnect can be located remote from the group — IF a plaque at the main group's location notes where it is.
Additional disconnects for fire pumps/emergency/standby systems must be installed REMOTE from the normal grouped disconnects — this minimizes the risk of one event knocking out both normal AND backup power together.
Multi-occupancy buildings: each occupant needs access to their own disconnect — unless building management continuously supervises electrical service/maintenance, in which case access can be restricted to authorized personnel only.
Slide 4 — Quiz + CTA Q: "Why must additional disconnects for fire pumps/emergency/standby systems be installed remote from the normal service disconnects?" A) To save space B) To minimize the chance both normal and backup power get interrupted simultaneously C) It's not actually required D) To reduce arc-flash exposure only
✅ Answer: B — 268.72(B): remote placement protects against simultaneous loss of normal and backup power.
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⚠️ Educational NoticeQuick Hits are educational explanations based on my understanding of the NEC. Always verify requirements in the current adopted NEC, applicable local amendments, manufacturer instructions, and with the AHJ.
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