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Installation instructions for mains wire-in protectors
Fuse connecting leads
The connecting leads to the phase/live terminals of the
ESP units should be fused.
This is to protect the connecting leads in the event of a
short circuit.
The fuse to the ESP unit (F
SPD
) should be lower than the
upstream supply fuse F
S
by a sufficient enough factor to
ensure fuse discrimination. As a general guide a factor of
at least 2 could be used (F
SPD
≤
0.5 F
S
), where the
maximum fuse to the ESP unit required is 125 amps
(if the supply fuse is 250 amps or greater).
10
Incoming
supply
fused F
S
HRC switch fuse or MCCB
F
SPD
, where F
SPD
< 0.5 F
S
PE
Enhanced
Mains
Protector
EN/IEC 61643
PATENT
APPLIED
FOR
LL
'
L2
L2'
L3
L3'
NN
'
11
14
12
ST
AT
US
Figure 13 - Installation of
ESP unit on first outgoing
way of distribution
board, nearest to the
incoming supply.
Refer to the fuse manufacturer’s operating characteristics
to ensure discrimination, particularly where an installation
includes a mixture of types of fuse, or of fuses and
circuit breakers.
Live/phase connecting leads can be fused by either:
(a) installing high rupture capacity (HRC) fuses or switch
fuses in the connecting leads at the supply end of the
lead
(See Figure 14)
, or
(b) installing up to a
125 amp circuit breaker
(MCCB or type ’C’ MCB).
Where the ESP unit is
installed via an outgoing
way
(8b earlier)
this
should incorporate
up to a 125 amp HRC
fuse or circuit breaker.
L
N
T2
C
T1
I
imp
4kA
I
n
20kA
I
max
oc
40kA
U
6kV
c
z
ac
U
280V 47-63H
B
D
T3
125 AgL
!
GREEN FULL PROTECTION
GREEN & RED
REDUCED
PROTECTION
(replace unit)
RED
NO PROTECTION
WARNING: If lit /
flashing disconnect
unit & check Neutral
to Earth voltage
EN/IEC 61643
PATENT
APPLIED
FOR
STATUS INDICATION
ESP 240D1
L
L
1
N
1
N
11
14
12
STATUS
Figure 14 - Busbar
mounted HRC fuse at
the end of the live
connecting lead.
TNB 1639 ESP D1 Instructions (Final Art) new size 1/4/10 09:51 Page 18
