B-5
Safety clearance
Minimum distance between two
adjacent circuit breakers
Minimum distance between circuit
breaker and front or rear panels
A1
DB115046.eps
Front
panel F
FB = 0
DB115697.eps
Bare or painted sheetmetal Note: if F < 8 mm: an insulating screen or long
terminal shield is mandatory (see page A-87).
Minimum safety clearances for Compact NSX100 to 630
Operating voltage Clearance (mm)
Between
devices
Between device and sheetmetal
Painted sheet metal Bare sheet metal
A1 C1 D1 D2 C1 D1 D2 D3
U y 440 V
for devices equipped with:
b no accessories 0 0 30 30 5 40 40 -
b short terminal shields 0 0 30 30 5 40 40 50
b interphase barriers 0 0 0 0 5 0 0 -
b long terminal shields 0 0 0 0 0 0 0 -
440 V < U y 500 V
for devices equipped with:
b short terminal shields 0 0 30 30 10 40 40 50
b interphase barriers (1) 0 0 0 0 20 10 10 -
b long terminal shields (2) 0 0 0 0 10 10 10 -
U > 500 V
for devices equipped with:
b short terminal shields 0 10 50 50 20 100 100 50
b long terminal shields 0 10 30 30 20 40 40 -
(1) Only for NSX100 to 250.
(2) For all cases.
Clearances with respect to live bare busbars
Minimum clearances for Compact NSX100 to 630
Operating voltage Clearances with respect to live bare busbars
spacing y 60 mm spacing > 60 mm
F1 F2 F1 F2
U < 440 V 350 350 80 80
440 V y U y 500 V 350 350 120 120
U > 500 V prohibited: insulating screen required between device and busbars
These clearances can be reduced for special installations as long as the conî‚¿guration is checked
by tests.
F1
Spacing y 60 mm
F2
F1
Spacing > 60 mm
Bars
Bars
F2
DB115698.eps
Live busbars.
Minimum distance between circuit breaker and top, bottom or side panels
DB414826.eps
D3
D1
D2 C1
DB413243.eps
D1
DB413244.eps
D1
DB413245.eps
D1
DB413246.eps
Short terminal shield rear connected.
Devices without accessories.
Devices with interphase barriers or long or short terminal shields.
Installation example
559E2100 Version : 3.1 13/04/2016
