WAC 296-307-36854. Wiring for capacitors

(1) All capacitors, except surge capacitors or capacitors included as a component part of other apparatus, must have an automatic means of draining the stored charge after the capacitor is disconnected from its source of supply. (2) Capacitors rated over 600 volts, nominal, must meet the following additional requirements: (a) Isolating or disconnecting switches (with no interrupting rating) must be interlocked with the load interrupting device or must have prominently displayed caution signs to prevent switching load current. (b) For series capacitors, the proper switching must be ensured by any of the following: (i) Mechanically sequenced isolating and bypass switches; (ii) Interlocks; or (iii) Switching procedure prominently displayed at the switching location.