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Total Solution to Earthing & Lightning Protection |
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Status Indication
for mains wire-in power
distribution SPDs is essential as they are installed
in parallel or shunt with the supply and as such
could potentially leave the system unprotected
should the SPD fail. 3-way status indication of the
SPDs condition provides simple and clear visual
inspection and further provides advanced pre-fail-
ure warning such that the system is never unpro-
tected. Furthermore warning of potentially fatal
neutral to earth faults due to incorrect earthing
and wiring faults for example is provided with
additional flashing indication.
Remote Indication
is an innovative feature that
further optimizes mains wire-in SPD protection.
A parallel or shunt installed SPD has additive
let-through voltage because of its connecting
leads that need to be kept as short as possible -
ideally no more than 25 cm. Often an SPD cannot
be mounted in its optimum position without
compromising the visibility of its status indication.
Innovative remote status indication displays
overcome this by allowing the SPD to be mounted
with short connecting leads with the separate
status display being conveniently mounted in a
visible position such as the front of a power
distribution cabinet providing convenient and
effective equipment protection.
Active Volt-free Contact
is an essential addition
to the visual 3-way status indication.
The changeover volt-free contact is simply
connected or linked to an existing building
management system, buzzer or light and should
the SPD have a pre-failure condition, this would
be remotely indicated - particularly important
for remote installations where the building
management system would be connected to a
telecom modem.
Active contacts further enable the SPD to also
conveniently warn of phase loss from a power
failure or blown fuse.
Electronic systems protection
Simplified product selection
Intelligent Display iD
is an innovation from Furse
that encompasses existing features of 3-way SPD
status indication with Neutral to Earth voltage
warning but through clear easy to read text on an
illuminated LCD display.
Often SPDs should be mounted on their side in
order to facilitate short connecting leads for better
protection levels but as this compromises the
position and appearance of the status indication,
it is not widely practiced.
Also available in a remote display option, the iD
feature enhances mains wire-in SPD installation as
the status indication text can easily be rotated (in
90° steps, clockwise) at the push of a button to
aid good installation practice.
Current Rating
indicates the maximum
continuous current rating of in-line SPDs for data
communication, signal and telephone lines.
The SPDs quoted maximum continuous current
rating should always exceed the peak running
current of the protected system to ensure normal
system operation is not impaired.
Damage, through overheating, would result if its
quoted current rating were exceeded.
Low In-line Resistance
states the resistance
value in Ohms (Ω) per line of SPDs for data
communication, signal and telephone lines.
A low in-line resistance is desirable; particularly for
systems with high running currents in order to
reduce any voltage drops across the SPD and
ensure normal system operation is not impaired.
Consideration should be made for additional SPDs
installed on the same line to protect connected
equipment at each end of the line (e.g. CCTV
camera and connected monitoring equipment) as
the in-line resistance of each SPD is introduced
into the system.