Table of Contents
Advertisement
Chapter 12 Helpful information
Alternative Methods
From the perspective of the IT system the optimal solution to this problem is to abstain from
using either RCCBs or RCBOs / GFCIs for the power supplied to data centres or computer
rooms. The standard wall sockets as they are very common in offices or house holds still have
to be protected by an RCCB.
The fact that the IT system is not RCCB / RCBO / GCFI protected can be easily done at the
access points by installing sings.
Whilst from a technical perspective it would be good to not use any RCCB / RCBO / GCFI it
may partly be not possible due to legal requirements. In such an instance alternative methods
should be considered.
One solution is to use residual current monitors. These monitors work similarly to an RCCB:
The vector sum of all currents on all active lines (L1, L2, L3 and N) are monitored. If the
threshold of the residual current monitor is exceeded then the utility power will not be cut off
but a control signal is generated which can be processed as needed. For example an optical
and / or acoustic warning can be activated in the affected room / area. Additionally a warning /
alarm message can be sent to the IT maintenance team.
If however legal requirements stipulate that RCCBs must be used then it is strongly
recommended to use RCCBs with the highest possible trip fault currents and longest possible
trip delay times are to be chosen.
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
193
Advertisement
Table of Contents
