1. (a) Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. The service disconnecting means shall plainly indicate whether it is in the open or closed position and shall be installed at a readily accessible location nearest the point of entrance of the service-entrance conductors.

2. (b) The service disconnecting means shall simultaneously disconnect all ungrounded conductors supplied through the service entrance conductors.

   Exception: No. 1: Metering equipment shall be permitted to be placed on the source side of the service switching device and fuses, provided the metering is suitably enclosed and no energized parts or wiring are exposed or accessible to other than employees of the serving agency.

   Exception: No. 2: Current transformers for protection of service equipment or current indication.

   Exception: No. 3: When suitable overcurrent protection and disconnecting means are provided, a circuit used for any of the following purposes shall be permitted to also be connected on the source side of the service entrance switching device: (a) Fire pumps; and (b) Potential or control transformers for electrical operation or protection of the service equipment, or for voltage indication. If voltage indication is provided, it shall be on all phases.

3. (c) Surge and lightning protection equipment shall be connected to the source side of switching devices.
4. (d) Each service disconnecting means shall be suitable for the prevailing conditions.

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

History

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

2. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).

3. Amendment of section and Note filed 4-1-2009; operative 4-1-2009. Submitted to OAL for printing only pursuant to Labor Code section 142.3 (Register 2009, No. 14).