NHP TemBreak PRO, User Manual

Page: 20 / 105

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.