What should be done before removing bus jumpers from receptacles?

Before removing bus jumpers from receptacles, it is critical to verify that power is removed to ensure safety. This is because bus jumpers carry electrical current necessary for the operation of various systems. If power is still present while removing the jumpers, it can lead to electrical shock or short circuits, posing a serious risk to the safety of personnel and equipment.

Verifying that power has been removed typically involves checking indicators or using appropriate testing devices to confirm the absence of voltage. This step is essential to maintain a safe working environment and prevent accidental energization during maintenance tasks.

Turning off the train's engine, while important for operational readiness, does not alone ensure that all power sources have been disengaged, as there may be other systems that could still be energized. Removing safety equipment is not advisable, as it can compromise the protection afforded to personnel when working in proximity to electrical systems. Lastly, although signaling for assistance can be a prudent action, it does not replace the necessity of ensuring that the power is completely off before beginning work on electrical components.