NEC EcoPowerGateway N8142-36F User Manual page 52

2-14 General Description
IMPORTANT: Never attempt to connect/disconnect the DC cable
while the DC power is being output. The DC cable and output port
connectors on Module Enclosure and EcoPowerGateway do not support
hot-swap mode.
5.
To turn off the DC power output, shutdown all the server units connected with the
EcoPowerGateway and blade servers in enclosure, then press the DC output switch.
After that, make sure that the DC output lamp is unlit.
To remove the DC cable, perform reverse order of installation procedure.
NOTE:
for how to power off the server unit or enclosure unit.
Refer to the User's Guide of the server unit or enclosure unit