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INSTALLATION INSTRUCTIONS
ESP M1/M1R
mains protectors
ESP 120 M1, ESP 208 M1, ESP 240 M1,
ESP 415 M1, ESP 277 M1, ESP 480 M1
and M1R variants
Contents
Key points of installation 1
Before installation 2
Installation 3
Installation check 4
Neutral-earth warning light 5
Status indication 6
Remote indication 7
Maintenance 8
Application Notes 9
Remote display drilling template 10
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INTRODUCTION
This document explains how to install Furse Electronic
Systems Protectors for three phase mains power
supplies:
Single phase ESP 120 M1, Three phase ESP 208 M1
and ESP 208 M1R, Single phase ESP 240 M1,
Three phase ESP 415 M1 and ESP 415 M1R,
Single phase ESP 277 M1, Three phase ESP 480 M1
and ESP 480 M1R
These instructions are prefaced by a summary of the
Key points of installation. Each key point is explained in
detail in the section entitled Installation.
Installation instructions for mains wire-in protectors
Safety note:
1.4 Connect to phase(s), neutral and earth.
NOTE: Units must have a neutral
connection (see 3.4).
1
Installation instructions
ESP M1/M1R mains protectors
Warning! Installation by person with electrotechnical
expertise only.
Warnung! Installation nur durch elektrotechnische
Fachkraft.
Avvertenza! Fare installare solo da un elettricista
qualificato.
Avertissement! Installation uniquement par des
personnes qualifiées en électrotechnique.
Advertencia! La instalación deberá ser realizada
únicamente por electricistas especializados.
ESP protector installation should be conducted by a
qualified competent person and comply with all relevant
Regulations and Legislation (including BS 7671 Wiring
Regulations and Building Regulations). Incorrect
installation will impair the effectiveness of
ESP protectors.
Always handle cables by their insulation. Never work on
ESP protectors, earthing or their cables during a storm.
Installation instructions for mains wire-in protectors
1. Key points of installation
1.1 Install protectors very close to the power supply to be
protected, either within the distribution panel or directly
alongside it.
1.2 Mount units within a panel or WBX enclosure.
1.3 Units are installed in parallel.
1.4 Connect to phases, neutral and earth.
NOTE: Units must have a neutral connection (see 3.4).
1.5 Units installed at power distribution boards can be
installed either:
– on the load side of the incoming isolator, or
– on the closest available outgoing way to the incoming
supply
1.6 Provide a means of isolation for the ESP unit.
1.7 The connecting leads to phase/live terminals should be
suitably fused (125 A maximum) ensuring full
discrimination with the immediate upstream supply fuse.
Installation instructions for mains wire-in protectors | 1/1
1.8 Connecting leads should be 10 mm2 multi stranded cable.
1.9 Keep the connecting leads as short as possible and ideally
less than 25 cm (10 inches) in length. This may be better
achieved with the equivalent M1R with remote display
mounting flexibility.
1.10 Bind the connecting leads tightly over their entire length.
1.11 Maximum torque for power terminals is 2.65Nm, wire
stripping length 17mm.
1.12 Maximum torque for remote contact is 0.25Nm, wire
stripping length 7mm.
1/2 | Installation instructions for mains wire-in protectors
2. Before installation
2.1 Check that the voltage between neutral and earth does
not exceed 10 volts.
If this voltage does exceed 10 volts, the installation is
unsafe.
Find and rectify the cause of this fault before proceeding.
2.2 Make sure that the supply voltage is suitable for the unit.
ESP 120 M1
Phase to Neutral/Earth
ESP 208 M1 and
ESP 208 M1R Phase to Phase
ESP 240 M1
Phase to Neutral/Earth
ESP 415 M1 and
ESP 415 M1R Phase to Phase
ESP 277 M1
Phase to Neutral/Earth
ESP 480 M1 and
ESP 480 M1R Phase to Phase
Installation instructions for mains wire-in protectors | 2/1
Supply Rated
Voltage (VRMS)
110/120/127 90-150
190/208/220 156-260
220/230/240 200-280
380/400/415 346-484
240/254/277 232-350
415/440/480 402-600
Unit Voltage
Range (VRMS)
Figure 1:
ESP 415 M1
installed
inside a power
distribution
panel.
3. Installation
3.1 Location
Protectors need to be installed very close to the power
supply to be protected. Usually the protector will be
installed at a power distribution panel either inside it
(Figure 1) or right next to it (Figure 2).
3.2 Enclose the ESP unit
The ESP unit has exposed terminals. For electrical safety,
the unit must be installed within a panel or enclosure. For
standard single and three phase units, where possible,
install the unit within the power distribution panel
behind a suitable viewing window.
3/1 | Installation instructions for mains wire-in protectors
Figure 2:
ESP 415 M1 installed next to a power distribution panel.
Alternatively, for three phase units, a remote display M1R
option is available. These units can be installed within the
power distribution panel with the remote display
mounted on the front of the panel.
Installation instructions for mains wire-in protectors | 3/2
NO
Volt free contact
ESP
240 M1
STATUS INDICATION
ELECTRONIC SYSTEMS
PROTECTION
Made by W J Furse & Co Ltd, ESP Division,
Wilford Road, Nottingham, NG2 1EB, UK
L
LN
L
1
N
N
WARNING
PATENT
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 280Vrms
Figure 3: Parallel
connection for single
phase supplies.
From
supply
When mounting the units in existing metal panels or
enclosures, ensure that the enclosure is securely bonded
to the earth bar to which the ESP unit will be connected.
If it is not possible to install the unit within the
distribution panel it should be mounted in a separate
enclosure, see Figure 2, as close as possible to the
distribution panel (see 3.9 - Length of connecting leads).
To
load
Gland the enclosure onto the power distribution panel.
Suitable enclosures are available from Furse.
3/3 | Installation instructions for mains wire-in protectors
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