Busbar sizing - Schneider Electric

Busbar sizing
Installation
recommendations
0
Basis of tables:
b maximum permissible busbars temperature: 100 °C
b Ti: temperature around the circuit breaker and its
connection
b busbar material is unpainted copper.
DB101487
Rear vertical connection
Masterpact
NT06
NT06
NT08 ou NW08
NT10 ou NW10
NT12 ou NW12
NT16 ou NW16
NT16 ou NW16
NW20
NW20
NW25
NW25
NW32
NW32
NW32
NW40
NW40
NW50
NW50
NW63
NW63
Maximum
service
current
Ti : 40 °C
No. of 5 mm
thick bars
400
630
800
1000
1250
1400
1600
1800
2000
2200
2500
2800
3000
3200
3800
4000
4500
5000
5700
6300
2b.30 x 5
2b.40 x 5
2b.50 x 5
2b.50 x 5
2b.63 x 5
2b.80 x 5
3b.63 x 5
2b.80 x 5
2b.100 x 5
2b.100 x 5
4b.80 x 5
4b.100 x 5
5b.100 x 5
6b.100 x 5
No. of 10 mm
thick bars
1b.30 x 10
1b.40 x 10
1b.50 x 10
1b.50 x 10
1b.63 x 10
1b.80 x 10
2b.50 x 10
1b.80 x 10
2b.63 x 10
2b.63 x 10
2b.80 x 10
2b.100 x 10
3b.80 x 10
3b.100 x 10
4b.100 x 10
4b.100 x 10
5b.100 x 10
5b.100 x 10
7b.100 x 10
8b.100 x 10
Ti : 50 °C
No. of 5 mm
thick bars
2b.30 x 5
2b.40 x 5
2b.50 x 5
2b.50 x 5
3b.50 x 5
2b.80 x 5
3b.63 x 5
2b.80 x 5
2b.100 x 5
2b.100 x 5
4b.80 x 5
4b.100 x 5
6b.100 x 5
6b.100 x 5
No. of 10 mm
thick bars
1b.30 x 10
1b.40 x 10
1b.50 x 10
1b.50 x 10
2b.40 x 10
2b.50 x 10
2b.50 x 10
2b.50 x 10
2b.63 x 10
2b.63 x 10
2b.80 x 10
2b.100 x 10
3b.100 x 10
3b.100 x 10
4b.100 x 10
4b.100 x 10
5b.100 x 10
6b.100 x 10
7b.100 x 10
8b.100 x 10
Ti : 60 °C
No. of 5 mm
thick bars
2b.30 x 5
2b.40 x 5
2b.50 x 5
2b.63 x 5
3b.50 x 5
3b.63 x 5
3b.80 x 5
3b.80 x 5
3b.100 x 5
3b.100 x 5
4b.100 x 5
4b.100 x 5
5b.100 x 5
No. of 10 mm
thick bars
1b.30 x 10
1b.40 x 10
1b.50 x 10
1b.63 x 10
2b.40 x 10
2b.50 x 10
2b.63 x 10
2b.63 x 10
2b.80 x 10
2b.80 x 10
3b.80 x 10
3b.80 x 10
4b.80 x 10
4b.100 x 10
4b.100 x 10
4b.100 x 10
6b.100 x 10
7b.100 x 10
8b.100 x 10
Example
Conditions:
b drawout version
b vertical connections
b Ti: 40 °C
b service current: 1100 A.
Solution :
For Ti = 40 °C use an NT12 or NW12 which can be
connected with two 63 x 5 mm bars or with one
63 x 10 mm bar.
Note: the values indicated in these tables have been extrapolated from test data and theoretical
calculations. These tables are only intended as a guide and cannot replace industrial experience
or a temperature rise test.
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