Introduction
This document explains
how to install Furse
Electronic Systems
Protectors for twisted
pair data communication/
signal/telephone lines:
ESP SL06
ESP SL15
ESP SL30
ESP SL50
ESP SL110
ESP SL RTD
ESP SL TN
And Surge Protectors for
Intrinsically Safe Areas:
ESP SL15X
ESP SL30X
Before installation
Current rating
Ensure that the current passing through the
Lightning Barrier does not exceed:
Current Rating
ESP SL**
750mA
ESP SL**X
750mA
ESP SL RTD
300mA
ESP SL TN
300mA
Working voltage
Make sure that the system’s maximum line
voltage (DC or AC peak) will never exceed the
maximum working voltage of the Lightning
Barrier. Otherwise the Lightning Barrier will
clamp signal voltages as though they were
transient overvoltages.
Normal
Maximum
working
working
Voltage
Voltage
ESP SL06
6V 7.79V
ESP SL15
15V 16.7V
ESP SL30
30V 36.7V
ESP SL50
50V 56.7V
ESP SL110
110V 132V
ESP SL RTD
6V 7.79V
ESP SL TN
296V 296V
Line resistance
Check that the voltage drop caused by the
resistance of the unit does not interfere with the
normal operation of the system.
Line Resistance
ESP SL**
1.0
Ω
ESP SL**X
1.0
Ω
ESP SL RTD
1.0
Ω
ESP SL TN
4.4
Ω
Bandwidth
Be sure that the Lightning Barrier’s bandwidth will
not restrict the system bandwidth.
Bandwidth (-3dB)
ESP 06
1.5MHz
ESP SL15 - ESP SL110
>85MHz
ESP SL**X
>85MHz
ESP RTD
800kHz
ESP TN
20.0MHz
Installation
Location
Lightning Barriers are usually located either:
(a) Near to where the lines requiring protection
enter or leave the building, or
(b) Close to the equipment being protected
(or actually within its control panel).
Either way, it is important that the Barrier’s
connection to earth (or barrier earth bond) is kept
short.
See Section 6 - Earthing
.
Enclose the Lightning Barrier
Lightning Barriers should be installed within a
panel or enclosure.
The Lightning Barrier should be ideally
installed within an existing cabinet/ cubicle or
in an enclosure to the required IP rating.
Suitable enclosures are available from Furse.
Lightning Barriers should always be installed in
a dry environment.
Series connection
Furse ESP Lightning Barriers are connected in-line
(or series) with the data communication, signal,
measurement, or telephone line.
See Figures 1a
and 1b
. The dirty, or
line
side of the protector
should be connected to the cable carrying the
incoming transient overvoltages. The output or
clean side of the protector ensures a transient free
signal to the equipment being protected.
Fixing methods
Furse ESP Lightning Barriers should be mounted
on 35mm DIN rail to EN 50022.
See Figure 2
.
The ESP Lightning Barriers DIN rail release clip
features a latch back mechanism to hold the clip
off the rail for easy removal and adjustment whilst
on the DIN rail. This release clip should be
engaged using a terminal screw driver or by hand
by pulling the clip out and upwards in the
housing.
See Figures 3a and 3b
.
Connections to line, clean, screen
and earth terminals
The
clean
end of the Lightning Barrier should be
connected to the cabling going to the protected
equipment.
See Figures 1a and 1b
.
Cable screens are connected to Earth (DIN rail and
Earth terminal) via the terminals marked
S
, except
the ESP SL RTD where the screen could be
connected to the Earth terminal marked .
The screw terminals should be tightened between
0.5 - 1Nm torque (Do not exceed 1Nm).
For isolated screens
For situations where the cable screen needs to be
isolated from the local Earth to avoid Earth loops
(e.g. Fire alarm panels) the isolated screen version
should be used (this has /I suffix in the part code
e.g. ESP SL30/I). With the isolated screen
version there is no continuity between the
Screen and Earth connections in the absence
of a transient overvoltage.
The screw terminals will accommodate conductor
of up to 4mm
2
. We recommend that these are
terminated with a boot lace ferrule
.
Earthing
Protectors for mains power supplies and Lightning
Barriers for data/signal/telephone lines should be
connected to the same earth point.
The Lightning Barrier should therefore be bonded
to the main electrical earth or earth star point.
This connection should be made, either:
(a) Through installation on a 35mm DIN rail
(which in turn is connected to earth).
(b) By connecting a earth cable to the barrier
via the Barriers Earth terminal marked .
See Figure 1a and 1b.
The best way to ensure a good earth connection
when using a DIN rail is to mount the DIN rail in a
metal cabinet. The entire length of the DIN rail
should be in contact with the metal of the cabinet
(if the cabinet is painted this should be removed
locally where the rail is to be mounted to give a
good electrical connection). The DIN rail should
then be bonded to the cabinet at its mounting
points and the chassis of the cabinet bonded to
the main electrical earth or earth star point.
Alternatively if a non-metal housing is used the
DIN rail should be bonded to a metal base plate.
The base plate should then be bonded to the
earth star point.
The barrier or base plate earth bond should be
less than 1m long (otherwise the effectiveness of
the protector will be reduced).
10mm
2
stranded green/yellow cable should be
used for this bond.
Barrier or base plate earth bonds of 2, 3 or 4m
are allowed if; 2, 3 or 4 parallel earth bonds are
used and these parallel earth bonds are kept at
least 5cm apart from each other.
.
..continued overleaf
6
5
4
3
2
1
4
2
3
1
WARNING:
Incorrect
installation will impair the
effectiveness of the ESP units
Figure 1a – Series connection of ESP SL** Series,
ESP SL**X Series and ESP SL TN.
Figure 2 – Installation on 35mm DIN rail.
Figure 3a – Slide out the DIN rail release clip.
1
S
2
3
S
4
Lightning B
a
rrier
From line
LINE
CLEAN
Earth
To equipment
Furse
Wilford Ro
a
d,
Nottingh
a
m,
NG2 1EB, UK
Clean
Line
30V
37.
8
V
750mA
1.0
10kA
43.5V
Nomin
a
l volt
a
ge
M
a
x working volt
a
ge,
C
urrent r
a
ting
In-line resist
a
n
c
e
M
a
x surge
c
urrent
Let-through volt
a
ge, U
Figure 3b – Pull up and release to engage the
latchback mechanism.
Figure 1b – Series connection of ESP SL RTD.
1
2
3
4
5
6
Lightning B
a
rrier
From line
LINE
CLEAN
Earth
To equipment
Furse
Wilford Ro
a
d,
Nottingh
a
m,
NG2 1EB, UK
Clean
Line
30V
37.
8
V
750mA
1.0
10kA
43.5V
Nomin
a
l volt
a
ge
M
a
x working volt
a
ge,
C
urrent r
a
ting
In-line resist
a
n
c
e
M
a
x surge
c
urrent
Let-through volt
a
ge, U
ESP SL06, ESP SL15, ESP SL30, ESP SL50, ESP SL110,
ESP SL15X, ESP SL30X, ESP SL TN, ESP SL RTD
TNB 2059 ESP Instructions v2:Layout 1 25/2/10 16:51 Page 2
