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Chapter 12 Helpful information
Recommended RCDs
The following table shows what leak current ratings RCDs have to have with what UPS power
rating.
UPS Power rating in kVA
≤ 3 kVA
> 3 kVA to 11 kVA, hard wired Do not use an RCD
Attention! UPS units with a power rating greater than 3 kVA are not to be protected by an RCD.
These UPS units comply with IEC-62040 which allows a maximum leak current of 5 % of
the maximum input current limit of these UPS units. This is why when wiring these kind
of UPS units to utility power the ground connection must be made first.
The maximum RCD that exists allows for a leak current of 420 mA.
For further information see
Corporation.
Refer to the relevant UPS installation guide for Ampère ratings of any CB or RCD for
Notes:
•
a specific UPS unit
Only the UPS unit itself can be protected by an RCD, a maintenance panel has to be
•
protected by a standard CB
If an RCD is in use then no other CB is to be used
•
An RCD must be tested at least once a year, which can lead to a shutdown of
•
the protected load
196
RCD leak current
30 mA
IEC-62040
(has to be paid for) and the
Curve type
D
Not applicable
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
letter f rom Eaton
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