Under no circumstances must the ESP unit be installed
without connection to its neutral.
Where no neutral is present (eg delta supplies) the
neutral (N) terminal on the ESP unit must be connected
to earth in addition to the earth ( ) terminal. This will
result in a greatly increased earth leakage current. On
some delta supplies the voltage between phase and
earth/ neutral may exceed the rating of the ESP unit.
Consequently, the supply’s phase to earth voltage must
be checked before installing the ESP unit.
We recommend that you consult ABB Furse ESP before
installing ESP units on delta supplies.
3.5 Connection point
(a) Protecting supplies feeding equipment in the
building
The ESP unit is typically connected to the power supply
at a power distribution board/panel, either:
(i) on the load side of the incoming isolator (
Figure 5
).
(ii) on the closest available outgoing way to the incoming
supply (ie the incoming isolator).
Installation instructions for mains wire-in protectors | 3/6
