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Installation instructions for mains wire-in protectors
Ensure the power supply does not exceed 125A
for series installations. The connecting leads to
phase/live terminals should be suitably fused (125A
maximum) ensuring full discrimination with the
immediate upstream supply fuse.
Figure 8
shows the connection diagram for three phase
star power supplies.
Figure 8 - Series
connection for
three phase star
(4 wire and
earth) supplies.
PE
L
L'
L2
L2'
L3
L3'
N
N'
11
14
12
STATUS
Enhanced
Mains
Protector
EN/IEC 61643
PATENT
APPLIED
FOR
ESP 415D1R
SURGE
PROTECTION
ACTIVE
Connection to phase, neutral and earth
Connections are made to each supply conductor including
earth. Terminals marked L, N, (single phase units) or L1,
L2, L3, N, (three phase units) must be connected to
phase/live, neutral and earth respectively.
7
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 Furse ESP before
installing ESP units on delta supplies.
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 9)
.
(ii) on the closest available outgoing way to the incoming
supply (ie the incoming isolator).
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TNB 1639 ESP D1 Instructions (Final Art) new size 1/4/10 09:51 Page 12
