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// CODE SNIPPET

210.4 Multiwire Branch Circuits

National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 210 Branch Circuits > 210.4 Multiwire Branch Circuits
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(A) General

Branch circuits recognized by this article shall be permitted as multiwire circuits. A multiwire circuit shall be permitted to be considered as multiple circuits. All conductors of a multiwire branch circuit shall originate from the same panelboard or similar distribution equipment.
Informational Note No. 1: A 3-phase, 4-wire, wye-connected power system used to supply power to nonlinear loads may necessitate that the power system design allow for the possibility of high harmonic currents on the neutral conductor.
Informational Note No. 2: See 300.13(B) for continuity of grounded conductors on multiwire circuits.

(B) Disconnecting Means

Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ungrounded conductors at the point where the branch circuit originates.
Informational Note: See 240.15(B) for information on the use of single-pole circuit breakers as the disconnecting means.

(C) Line-To-Neutral Loads

Multiwire branch circuits shall supply only line-to-neutral loads.
Exception No. 1: A multiwire branch circuit that supplies only one utilization equipment.
Exception No. 2: Where all ungrounded conductors of the multiwire branch circuit are opened simultaneously by the branch-circuit overcurrent device.

(D) Grouping

The ungrounded and grounded circuit conductors of each multiwire branch circuit shall be grouped in accordance with 200.4(B).

Related Code Sections


210.4 Wiring and Protection, Multiwire Branch Circuits
Branch circuits recognized by this article shall be permitted as multiwire circuits. A multiwire circuit shall be permitted to be considered ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 210 Branch Circuits > 210.4 Multiwire Branch Circuits
(1) Wiring and Protection, Multiwire Branch Circuits
Individual single-pole circuit breakers, with identified handle ties, shall be permitted as the protection for each ungrounded conductor of multiwire ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 240 Overcurrent Protection > 240.15 Ungrounded Conductors > (B) Circuit Breaker as Overcurrent Device > (1) Multiwire Branch Circuits
(B) Wiring Methods and Materials, Multiwire Branch Circuits
Where connected to a multiwire branch circuit, the disconnecting means shall simultaneously disconnect all the supply conductors, including ...
National Electrical Code 2020 of Minnesota > 3 Wiring Methods and Materials > 393 Low-Voltage Suspended Ceiling Power Distribution Systems > 393.21 Disconnecting Means > (B) Multiwire Branch Circuits
(2) Equipment for General Use, Multiwire Branch Circuits
When connected to multiwire branch circuits, the disconnecting means shall simultaneously break all the supply conductors to the ballast, including ...
National Electrical Code 2020 of Minnesota > 4 Equipment for General Use > 410 Luminaires, Lampholders, and Lamps > 410.130 General > (G) Disconnecting Means > (2) Multiwire Branch Circuits
700.19 Special Conditions, Multiwire Branch Circuits
The branch circuit serving emergency lighting and power circuits shall not be part of a multiwire branch circuit ...
National Electrical Code 2020 of Minnesota > 7 Special Conditions > 700 Emergency Systems > 700.19 Multiwire Branch Circuits
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