What state of the locking device must be in place when servicing electrical equipment, cables and wires

What state must the locking device of all switches be in place when servicing electrical equipment , cables and wires?
Answer: All the locking devices of the switch must be able to reliably prevent unauthorized power transmission and unauthorized operation of the device. The switch handle must be locked when the power is turned off, and the warning sign "Someone is working, no power is allowed" is displayed. The person working will have the right to remove the card for power transmission.

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