Cal. Code Regs. Tit. 8, § 2940.17 - Disconnecting Capacitors and Means for Discharge
The following requirements apply to work on capacitors and on lines connected to capacitors.
(a) Before employees work on capacitors, the
employer shall disconnect the capacitors from energized sources and short
circuit the capacitors. A means shall be provided to reduce the residual
voltage of a capacitor to 50 volts or less within 5 minutes after the capacitor
is disconnected from the source of supply. The employer shall ensure that the
employee short circuiting the capacitors waits at least 5 minutes from the time
of disconnection before applying the short circuit.
(b) A discharge circuit shall be provided
with automatic means of connecting it to the terminals of the capacitor bank
after disconnection of the capacitor from the source of supply. The windings of
motors, or transformers, or of other equipment directly connected to capacitors
without a switch or overcurrent device interposed shall meet the requirements
of subsection (a) above.
(c)
Capacitors shall not be worked on until after they have been short circuited
and grounded. The employer shall short circuit any line connected to capacitors
before the line is treated as deenergized. The internal discharge device
provided in capacitors shall not be used as a substitute for externally short
circuiting and grounding capacitors.
(d) Before employees handle the units, the
employer shall short circuit each unit in series-parallel capacitor banks
between all terminals and the capacitor case or its rack. If the cases of
capacitors are on ungrounded substation racks, the employer shall bond the
racks to ground.
Notes
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
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