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Comet installation and user manual: E-6761200XT/FB
11.5Merlin Gerin by MGE UPS SYSTEMS
selection of cable cross-sections
The cross-section of cables depends on:
■ current levels (temperature rise);
■ permissible line voltage drop (3% for AC circuits, 1% for battery circuits);
■ installation (cable rack, troughs, etc.).
Consult the applicable standards to determine the minimum cross-sections for the
desired currents.
Each of the above parameters, for a given type of Comet, is important in
determining the minimum permissible cross-sections.
When confronted with several possibilities, always select the larger value. Cables
must be flexible type.
The currents indicated below are maximum values given for minimum voltages:
Comet Comet absorbed line currents (A)
rated output AC input AC output battery option
(kVA) current (XR1) current (XR2) (XR3)
series 11 5262330
7.5 40 35 48
10 52 46 46
series 31 (1) 5 23 (9) 23 30
7.5 35 (14) 35 48
10 46 (18) 46 46
15 69 (27) 69 76
20 91 (36) 91 75
series 33 (2) 10 18 (26) 15 (26) 46
15 27 (40) 23 (40) 76
20 36 (52) 30 (52) 75
30 54 (78) 45 (78) 112
Note 1: when a "separate Mains 2" option is installed on Comet series 31 for the AC
bypass input, the values in parentheses correspond to Mains 1 line currents and the others
to Mains 2 line currents.
Note 2: for Comet series 33, during operation on the "static bypass" at rated output for a
non-linear load, the values in parentheses correspond to the current in the AC input line
neutral.
For connections to the AC input power supply and to the load, Comet terminal
blocks accept the following cable cross-sectional areas:
Comet Comet rated output cross-sectional areas (mm
2
)
(kVA) flexible cables rigid cables
series 11 and 5 0 to 4 0 to 6
series 31 7.5 and 10 0 to 10 0 to 16
series 31 15 and 20 16 to 35 16 to 35
series 33 10 and 15 6 to 16 6 to 25
20 and 30 16 to 35 16 to 35