Page
|
15
Installation instructions for mains wire-in protectors
Page
|
14
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 10.
On small, compact, metal cased distribution boards, (such
as small MCB boards) the first way is preferable, although
any outgoing way is suitable.
On a large board such as a cubicle switchboard, it is better to
install the protector on the load side of the incoming isolator
PE
Enhanced
Mains
Protector
EN/IEC 61643
PATENT
APPLIED
FOR
LL
'
L2
L2'
L3
L3'
NN
'
11
14
12
ST
AT
US
Figure 9 - ESP unit mounted
within a distribution board
connected to the incoming
supply on the load side
(ie downstream) of the
isolator. (Note the additional
earth bond to the metalwork
of the distribution board.)
This technique is
explained in 12(iii)
PE
Enhanced
Mains
Protector
EN/IEC 61643
PATENT
APPLIED
FOR
LL
'
L2
L2'
L3
L3'
NN
'
11
14
12
ST
AT
US
Figure 10 - 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 12 Length of connecting leads -
this also gives an alternative technique in 12(iii).)
(eg in the metering section). Fitting the protector in any other
position could affect the protector’s performance.
(iii) directly to the busbars via suitable HRC fuses, switch
fuses or MCCBs
- see Section 10.
TNB 1639 ESP D1 Instructions (Final Art) new size 1/4/10 09:51 Page 14
