Dell EMC NX4 Series Manual page 4

Handling field replaceable units (FRUs)
Before touching any FRU, touch a bare (unpainted) metal surface of the cabinet or storage
system.
Before removing any FRU from its antistatic bag, place one hand firmly on a bare metal
surface of the storage system, and at the same time, pick up the FRU while it is still sealed
in the antistatic bac. Once you have done this do not move around the room or touch
other furnishings, personnel, or surfaces until you have installed the FRU.
When you remove a FRU from the antistatic bag, avoid touching any electronic
components and circuits on it.
If you must move around the room or touch other surfaces before installing a FRU, first
place the FRU back in the antistatic bag. When you are ready again to install the FRU,
repeat these procedures.
4 Replacing a Standby Power Supply