Comet installation and user manual: E-6761200XT/FB
11.5
Merlin 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
5
26
23
30
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
