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D-46
Cables
Practical guidelines
Schneider Electric provides cabling recommendations according to the rating of the
circuit breaker.
The size of cables must be selected according to:
the level of current
the ambient temperature around the conductors
the degree of protection for the switchboard.
The tables below take into account the installation conditions for each type of device
(permissible temperature at connection terminals, etc.).
They follow the temperature derating values for installed devices in all cubicles with
cover panels rated IP
y
55.
b
switchboard internal temperature 60 °C
b
connections using copper cables.
b
b
b
Connection of circuit breakers
Size of
cables
(mm²)
Permissible current (A)
Cables tied individually
Cable tied together
IP
y
31
IP > 31
IP
y
31
IP > 31
1 5
16
14
14
12
2 5
25
25
22
20
4
32
29
28
24
6
40
39
36
33
10
63
55
55
50
16
90
77
80
70
25
110
100
100
93
35
135
125
125
120
50
180
150
70
230
190
95
275
230
Connection of other devices
Size of
cables
(mm²)
Permissible current (A)
Cables tied individually
Cable tied together
IP
y
31
IP > 31
IP
y
31
IP > 31
1 5
13
12
12
10
2 5
23
21
20
19
4
28
26
25
22
6
36
35
32
30
10
55
50
50
46
16
80
70
72
63
25
100
90
90
84
35
120
115
110
103
50
165
135
70
210
176
95
250
210
Connection of NSX100 to 630 A
Device NSX100
NSX160
NSX250
Size
(mm²)
25
50
95
Note:
Schneider Electric recommends connecting NSX400/630 circuit breakers with insulated
flexible bars or rigid bars, see page D-44.
Note:
the values indicated above have been validated for Prisma Plus switchboards.
Designing connections with
cables
Additional informations
Designing electrical
characteristics