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3
Installation and Operating Instructions
nVent ERICO Surge Reduction Filters (SRFs) from nVent
incorporate high energy clamping devices and special filtering
circuitry. SRFs are installed in series with the circuit, usually at
the point of entry to the building or structure. They are available
in single or three-phase configurations for load currents from
63A to 800A per phase.
The purpose of an SRF is to filter and protect against lightning
induced transients. The SRF provides a clean, filtered supply of
electricity to all output connected equipment when installed in
accordance with the manufacturers ' instructions.
Protection is achieved via a three stage circuit. This includes
the internal nVent ERICO Spark Gap unit as the primary surge
diverter, a purpose designed low pass filter network and a
secondary Transient Discriminating (TD) diversion stage to
further clamp the transient energy to safe levels. This allows
the SRF to:
• Provide filtering to the clamped waveform in order to reduce
the rate of voltage rise.
• Provide a secondary stage of surge diversion to protect
equipment from transients which may be induced onto the
SRF output cables or be caused by the load itself.
The use of this combination of technologies provides the
benefits of high surge capability, low let through voltage
and considerably reduced dv/dt. This applies to both surge
performance and over-voltage withstand from short and long
duration high-energy surges.
1 INTRODUCTION
HAZARDOUS VOLTAGES EXIST WITHIN THE SRF ENCLOSURE.
THIS UNIT SHOULD BE INSTALLED & SERVICED ONLY
BY QUALIFIED PERSONNEL AND IN ACCORDANCE WITH
RELEVANT NATIONAL ELECTRICAL & SAFETY CODES. ALL
INSTRUCTIONS MUST BE FOLLOWED TO ENSURE CORRECT
AND SAFE OPERATION OF THE SRF.
• Over-current and short-circuit protection must be provided to
protect the SRF and associated wiring if a fault develops. The
over-current protection should be installed in such a manner as
to provide a means of isolating the SRF from the main supply.
This unit contains overvoltage protection components and
may be damaged by installation resistance testing.
• SRFs contain capacitors. Disconnect power at least
1 minute prior to opening door. Check voltage prior to
working on SRF internals.
• SRFs must be connected to a low impedance earth (
<10Ω
)
for correct operation.
• SRFs must be installed in accordance with ALL relevant
national electrical and safety codes.
• The power supply to the SRF should always be turned off
(and locked) before the door is opened for any purpose.
• Check all SRF terminals for tight connections.
(Some terminals may become loose during transport).
• Ensure all input and output cabling, once installed is
tightened to the correct torque settings (see table 2).
• Do not disconnect upstream Earth or Neutral connections
supplying the SRF while power is still applied, as this may
damage the SRF or load.
• No combustible items should be stored within the SRF
during operation.
• Do not leave this manual inside the SRF after applying power
to the SRF. Retain this manual for future reference.
• Failure to heed instructions or warnings may result
in personnel injury, equipment damage or ineffective
transient protection.
2 WARNING
