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Systems to be Grounded. Systems that supply premises wiring shall be grounded as follows:
(a) Two-Wire Direct Current Systems. Two-wire DC systems operating at over 50 volts through 300 volts between conductors shall be grounded.
Exceptions: 1. A system equipped with a ground detector and supplying only industrial equipment in limited areas.
2. A rectifier derived DC system supplied from a grounded AC system.
3. DC Fire Alarm Circuits having a maximum current of 0.030 amperes.
(b) Three-Wire Direct-Current Systems. The neutral conductor of all 3-wire DC systems shall be grounded.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. Editorial correction filed 11-2-83 (Register 83, No. 45).
2. 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).
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