NHP TemBreak PRO - Insulating Distance

Installation
20
TemBreak PRO B_BE-UM-001-EN  V1.1.0
Insulating Distance
When earth metal is installed within proximity of the breakers, the correct insulating distance must be maintained, (refer to Minimum Clearance).
This distance is necessary to allow the exhausted arc gases to disperse. This could include the mounting plate or side panel within a switchboard.
Minimum Clearance
Below illustrates the minimum clearance that must be maintained.
Dim.
Description
MCCB Cat. No.
Distances (mm)
A
B
1
B
2
C
D
E
A
Distance from lower breaker to open charging part of terminal on
upper breaker (front connection) or the distance from lower
breaker to upper breaker end (rear connection and plug-in type)
B250 P / R
100
80
60
0
50
^
B400 P / R
120
120
80
0
80
^
B800 F / N / D
120
70
40
0
30
^
B
1
Distance from breaker end to ceiling (earthed metal)
B800 H / G
150
80
50
0
40
^
B
2
Distance from breaker end to insulator
B800 P / R
150
70
40
0
30
^
C
Clearance between breakers
B1000 N / H / D
150
70
40
0
30
^
D
Distance from breaker side to side plate (earthed metal)
B1250 N / H / HL / D
150
70
40
0
30
^
E
Length of insulation over exposed conductors.
B1600 N / HL / D
150
150
100
0
100
^
^ Insulate the exposed conductor until it overlaps the moulded case at the terminal, or the terminal cover.