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Installation instructions for mains wire-in protectors
WARNING
: The longer the connecting leads (between
the mains cable or busbars and the terminals of the ESP
unit), the greater the voltage let-through the protector.
If the resultant let-through voltage is higher than the
susceptibility level of the equipment to be protected,
damage will result.
Connecting leads up to 50 cm (20 inches) can be
used when:
(i) Two sets of 6 mm
2
cables are used (ie two sets of live,
neutral and earth conductors). Each set of conductors is
tightly bound together, using Ty-Raps
®
, tape or
spiral wrap.
This should be done for the entire length of the cable or
as far as is possible. The two sets of bound conductors
should be separated in their routeing. Ideally a distance
of 10 cm (4 inches) should be maintained between the
two sets of conductors as far as possible.
See Figure 15
.
(ii) Alternatively, if only one conductor needs to be longer
than 25 cm then use a pair of separated (as above)
conductors to make that connection.
See Figure 10
.
(iii) For metal distribution boards, if only the earth
connection needs to be longer than 25 cm, the
following procedure is suggested
(see Figure 10)
:
Size of connecting leads
For parallel connection, the connecting leads between the
terminals of the ESP unit and the power supply should be
10 mm
2
multi stranded conductor (copper). If required,
the terminals on the ESP unit will accept connecting leads
of up to 35 mm
2
.
(For series connection, see 6).
Length of connecting leads – parallel connection
For ESP units installed in parallel, the connecting leads
should be kept as short as possible and ideally should
not exceed 25 cm (10 inches) from the busbars to the
unit’s terminals.
ESP units can be mounted upside down or on their
side if this facilitates shorter connecting leads.
ESP D1/LCD units include a rotating display function for
improved legibility when units are mounted sideways or
upside down
(see page 31)
.
ESP protectors with remote display units (D1R variants)
allow the protector to be mounted with short connecting
leads whilst allowing the display to be positioned
independently (eg conveniently on the front of the panel).
The display is connected to the protector via the supplied
1 m cable (4 m cable optional). The remote display cut-out
template, which can be found at the back of these
instructions, conforms to the standard DIN 72x36 format.
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TNB 1639 ESP D1 Instructions (Final Art) new size 1/4/10 09:51 Page 20
