The RCCB shall meet the following requirements:
• Be sensitive to the DC unidirectional pulse (class A) of the whole distribution network
• Be insensitive to transient state current pulse
• Have an average sensitivity which is 0.3A ~ 3A adjustable
The RCCB symbols are shown in Figure 4.1 below.
Figure 4.1 RC C B sym bols
The UPS has an internal EMC filter, therefore the protective earth cable has leakage current which is less than 3000mA. 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 an optional BCB box 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
output distribution protection switch and able to provide overload protection (refer to Table 12.6 on page185 and Table 12.7
on page186).
N O T E: For IT grid system , 4-pole protective com ponents must be installed for the U PS external input
pow er distribution.
4 Electrical Installation
39
Vertiv™ Liebert® EXM2 UPS User Manual
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