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
Figure 6:
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).)
NO
Vo
lt free contact
ESP
415 M1
ST
AT
US INDICA
TION
ELECTRONIC SYSTEMS PROTECTIO
N
Made by W J Furse & Co Ltd, ESP
Division, Wilford Road, Nottingham, NG2 1EB, UK
L
1
L
1
L
2
L
3
N
N
WA
RNIN
G
PA
TENT
APPLIED
FO
R
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltage
L
2
L
3
NC
C
GREE
NF
UL
L
PROTECTION
NO PROTECTIO
N
REDUCED PROTECTION (replace unit)
GREEN & RE
D
RE
D
Let-through voltag
e6
00
V
3 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 480
Vr
ms
Alternative
first
outgoing
way
Main
Isolator
Distribution Board
ESP M1 protector, sited in
WBX enclosure, connected
to first outgoing way
NO
Vo
lt free contac
t
ESP
415 M1
ST
AT
US INDICA
TION
ELECTRONIC SYSTEMS PROTECTION
Made by W J Furse & Co Ltd, ES
P
Division, Wilford Road, Nottingham, NG2 1EB, UK
L
1
L
1
L
2
L
3
N
N
WA
RNIN
G
PAT
EN
T
APPLIED
FO
R
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltag
e
L
2
L
3
NC
C
GREEN
FULL
PROTECTION
NO PROTECTION
REDUCED PROTECTION (replace unit)
GREEN & RE
D
RE
D
Let-through voltage
600V
3 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 480V
rm
s
To
outgoing
ways
Load side
Isolator
L
1
L
2
L
3
N
Supply side
NO
Vo
lt free contac
t
ESP
415 M1
ST
AT
US INDICA
TION
ELECTRONIC SYSTEMS PROTECTION
Made by W J Furse & Co Ltd, ES
P
Division, Wilford Road, Nottingham, NG2 1EB, UK
L
1
L
1
L
2
L
3
N
N
WA
RNIN
G
PAT
EN
T
APPLIED
FO
R
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltag
e
L
2
L
3
NC
C
GREEN
FULL
PROTECTION
NO PROTECTION
REDUCED PROTECTION (replace unit)
GREEN & RE
D
RE
D
Let-through voltage
600V
3 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 480V
rm
s
To
outgoing
ways
Load side
Isolator
L
1
L
2
L
3
N
Supply side
NO
Vo
lt free contac
t
ESP
415 M1
ST
AT
US INDICA
TION
ELECTRONIC SYSTEMS PROTECTION
Made by W J Furse & Co Ltd, ES
P
Division, Wilford Road, Nottingham, NG2 1EB, UK
L
1
L
1
L
2
L
3
N
N
WA
RNIN
G
PAT
EN
T
APPLIED
FO
R
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltag
e
L
2
L
3
NC
C
GREEN
FULL
PROTECTION
NO PROTECTION
REDUCED PROTECTION (replace unit)
GREEN & RE
D
RE
D
Let-through voltage
600V
3 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 480V
rm
s
To
outgoing
ways
Load side
Isolator
L
1
L
2
L
3
N
Supply side
NO
Vo
lt free contac
t
ESP
415 M1
ST
AT
US INDICA
TION
ELECTRONIC SYSTEMS PROTECTION
Made by W J Furse & Co Ltd, ES
P
Division, Wilford Road, Nottingham, NG2 1EB, UK
L
1
L
1
L
2
L
3
N
N
WA
RNIN
G
PAT
EN
T
APPLIED
FO
R
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltag
e
L
2
L
3
NC
C
GREEN
FULL
PROTECTION
NO PROTECTION
REDUCED PROTECTION (replace unit)
GREEN & RE
D
RE
D
Let-through voltage
600V
3 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 480V
rm
s
To
outgoing
ways
Load side
Isolator
L
1
L
2
L
3
N
Supply side
NO
Vo
lt free contac
t
ESP
415 M1
ST
AT
US INDICA
TION
ELECTRONIC SYSTEMS PROTECTION
Made by W J Furse & Co Ltd, ES
P
Division, Wilford Road, Nottingham, NG2 1EB, UK
L
1
L
1
L
2
L
3
N
N
WA
RNIN
G
PAT
EN
T
APPLIED
FO
R
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltag
e
L
2
L
3
NC
C
GREEN
FULL
PROTECTION
NO PROTECTION
REDUCED PROTECTION (replace unit)
GREEN & RE
D
RE
D
Let-through voltage
600V
3 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 480V
rm
s
To
outgoing
ways
Load side
Isolator
L
1
L
2
L
3
N
Supply side
NO
V
ol
t free co
ntact
ESP
240 M1
ST
A
TUS INDICA
TION
ELECTRONIC SYSTEMS
PROTECTION
Made by W J
Furse &
Co Ltd,
ESP
Divi
sion,
W
ilford Road
, Nottin
gham, NG2 1EB, UK
L
L
N
N
W
ARNING
P
A
TENT
APPLIED
FOR
If lit
/ flashing disconnect
unit & check Neutral to
Earth supply voltage
NC
C
GREEN
FULL
PROTECTION
NO PROTECTION
REDUCED PROTECTION
(replace unit)
GREEN & RED
RED
Let-through voltage
600V
1 phase/50Hz
(Live to Neutral, Live to Earth & Neutral to Earth)
Vmax 280V
rms
Outgoing way
internal to the
building
Outgoing way
to external load
Incoming supply
Outgoing ways internal to the building