Vertiv APM 0250kMK16FN02000, User Manual

Page: 45 / 192

F igu re 4.1 R CCB sym bo ls
The UPS has an internal EMC filter, therefore the protective earth cable has leakage current which is less than 3000 mA. It is
recommended to confirm the RCD sensitivity of the upstream input distribution and the downstream distribution (to the
load).
External battery
The BCB must be installed for protecting the external battery. The UPS provides a mandatory BCB cabinet to provide
overcurrent protection, short circuit protection and automatic tripping functions for the external battery.
This BCB is important for the battery maintenance, and is generally installed near the battery.
System output
The UPS output distribution shall be configured with a protective device. The protective device shall be different from the
input distribution protection switch and able to provide overload protection (refer to Table 12.6 on page 178 and Table 12.7
on page 179).
N O T E: F o r IT grid system , 4-po le pro tective co m po n en ts m u st be in stalled fo r th e UP S extern al in pu t
po wer distribu tio n .
4 Electrical Installation
37
Vertiv™ Liebert® APM Plus User Manual