490 – Equipment Over 1000 Volts, Nominal

490.21(A)(5) – Retrofit Trip Units with Circuit-Interrupting Devices

Change at a Glance:

Retrofit trip units are now required to be listed for use with the specific circuit breaker with which it is installed.

490.21 Circuit- Interrupting Devices (Equipment Over 1000 Volts, Nominal)

(A) Circuit Breakers
(1) Location.
(2) Operating Characteristics.
(3) Nameplate.
(4) Rating.
(5) Retrofit Trip Units. Retrofit trip units shall be listed for use with the specific circuit breaker with which it is installed.

(see NEC for complete Code text)

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