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Installation instructions for mains wire-in protectors
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Application notes
ESP coordination
ESP D1, D1R, D1/LCD and D1R/LCD units are designed to
fully coordinate with ESP units of equivalent system
voltage on the same installation.
For example the ESP 415 M2 located at the main
distribution panel would coordinate effectively with
the ESP 415 D1 unit typically located at sub-distribution
panels. No additional de-coupling elements such as
inductors are needed to ensure ESP units achieve
coordination.
Always ensure ESP units are used on the same installation
to ensure coordination. Mixing ESP units with alternative
manufacturers’ units could result in damage to both
protection units and connected equipment through
poor coordination.
RCD units
ESP units should ideally be installed before (or upstream of)
residual current devices (RCDs) and not on the load side.
ESP units should only be installed on the load side of the
RCDs if the load in question is external to the building.
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This should help to reduce any spurious tripping of such
devices due to transient overvoltages. Special transient
hardened RCDs (type ’S’) can be obtained from a number
of manufacturers.
Insulation tests (flash testing)
The ESP unit should be fully disconnected from the circuit
before testing. Otherwise the ESP unit will treat the
insulation test as a transient overvoltage and control the
voltage to a low level - thereby defeating the object of
the test.
Duplex configuration
For systems demanding extremely high reliability ESP units
can be connected in duplex format. The use of two units
will achieve an improvement in performance and increased
lifetime over a single ESP unit at high discharge current
levels.
Each unit should have its own (separate) wiring and
its own isolation.
If possible the two units should be connected to the
power supply a short distance apart either:
(a) onto the first two outgoing ways
(b) up to a metre apart on the incoming power supply
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TNB 1639 ESP D1 Instructions (Final Art) new size 1/4/10 09:51 Page 36
