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Subchapter 5. Electrical Safety Orders
Group 1. Low-Voltage Electrical Safety Orders
Article 4. Requirements for Electrical Installations

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§2340.22. Identification of Equipment.

(a) Motors and Appliances.

Each disconnecting means required by this Safety Order for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident.

(b) Services, Feeders, and Branch Circuits. Each service, feeder, and branch circuit, at its disconnecting means or overcurrent device, shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident.

(c) Each service disconnecting means shall plainly indicate whether it is in the open or closed position.

(d) Durability of Markings. The markings shall be of sufficient durability to withstand the environment involved.

(e) Capable of Accepting a Lock. Effective with installations made after May 5, 2008 disconnecting means required by these Orders shall be capable of being locked in the open position.

(f) Marking for Series Combination Ratings.

Effective with installations made after May 5, 2008:

(1) Where circuit breakers or fuses are applied in compliance with the series combination ratings marked on the equipment by the manufacturer, the equipment enclosures shall be legibly marked in the field to indicate that the equipment has been applied with a series combination rating.

(2) The marking required by subsection (f)(1) of this section shall be readily visible and shall state “Caution - Series Combination System Rated --- Amperes. Identified Replacement Component Required.”

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Repealer and new section filed 3-23-79; effective thirtieth day thereafter (Register 79, No. 12). For history of former section, see Register 75, No. 42.

2. Editorial correction filed 11-2-83 (Register 83, No. 45).

3. Amendment filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).

4. Amendment of section and Note filed 5-5-2008; operative 5-5-2008. Submitted to OAL for printing only pursuant to Labor Code 142.3(a)(3) (Register 2008, No. 19).

5. Change without regulatory effect amending subsection (f)(2) filed 5-7-2012 pursuant to section 100, title 1, California Code of Regulations (Register 2012, No. 19).

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