Quick Hits

EPISODE 8 — 265.10

Ungrounded Conductors Tapped From Grounded Systems

SLIDE 1 — 265.10

UNGROUNDED CONDUCTORS TAPPED FROM GROUNDED SYSTEMS

265.10 permits certain:

🔹 Two-wire DC circuits

and

🔹 AC circuits with two or more ungrounded conductors

to be tapped from ungrounded conductors of a circuit having a grounded neutral conductor.

SLIDE 2 — SWITCHING REQUIREMENT

Here's the part to watch:

Each ungrounded conductor of the tapped circuit must have a pole in the switching device.

And when a multipole switching device serves as the disconnecting means:

all poles must manually switch together.

SLIDE 3 — WHERE ELSE DOES IT POINT?

265.10 references requirements involving:

🔹 Lampholders
🔹 Electric-discharge lighting equipment
🔹 Appliances
🔹 Electric space heating
🔹 Deicing/snow melting
🔹 Motor controllers
🔹 Motors

Again...

FOLLOW THE CROSS-REFERENCES.

SLIDE 4 — REVIEW ⚡

A tapped AC branch circuit has multiple ungrounded conductors.

What does 265.10 require regarding switching?

A. Only the grounded conductor must be switched

B. Each ungrounded conductor must have a pole in the switching device

C. No switching is permitted

D. Only one ungrounded conductor can be switched

ANSWER: B

← View Chapter 2 Home

← Back To Article 250 Home

← Back To Quick Hits Home