ABB ESP M1R Installation Instructions Manual page 14

Alternative
first
outgoing
way
Load side Load side Load side Load side Load side
Figure 6:
Supply side Supply side Supply side Supply side Supply side
Three phase ESP protector connected to the nearest available outgoing
(MCB) way to the incoming supply. The MCB also provides the means of
isolation. Since there is insufficient space within the distribution board
the ESP unit has been mounted within a separate enclosure, directly
alongside the board. Note the double connection to earth, in order to
compensate for the long connecting leads. (See 3.9 Length of
connecting leads - this also gives an alternative technique in 3.9(iii).)
The ESP unit can be connected via one of the
distribution board's outgoing fuseways or circuit
breakers.
Ideally, the ESP unit should be connected to the
outgoing way which is nearest to the incoming supply
(or isolator). See Figure 6.
3/7 | Installation instructions for mains wire-in protectors
outgoing outgoing outgoing outgoing outgoing
Distribution Board
Main
Isolator
L L L L L
1 1 1 1 1
To To To To To
ways ways ways ways ways
ESP M1 protector, sited in
WBX enclosure, connected
to first outgoing way
Isolator Isolator Isolator Isolator Isolator
L L L L L L L L L L N N N N N
2 2 2 2 2 3 3 3 3 3