ERICO TSG Series Surge Reduction Filters (TSG-RSF) - Manual (Page 13)

www.erico.com 13
Optimising Performance/Fusing
6. OPTIMISING PERFORMANCE
The protection equipment must be
earthed and installed in accordance with
all relevant national electrical and safety
standards. The term "point of entry" protec-
tion, is a general descriptive concept of zonal
boundary protection, as detailed in standards
such as IEC 1024. Some local wiring regula-
tions will allow the protection equipment to
be mounted directly at the point of entry,
while other countries require protection
equipment to be installed after the metering
or main circuit isolators or over-current
protection.
The following installation points
require attention to ensure that optimal
protection is provided by the protection
equipment. This information is provided
as a guide only. Compliance with local
electrical and safety regulations must be
ensured.
6.1 FUSING
Over-current and short-circuit protection must
be provided in order 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 mains supply. This
is an important safety consideration. Over-
current protection provided within the
SRF is not designed to act as a means of
isolation. Over-current protection within the
SRF does not necessarily isolate all TSG-SRF
components.
To allow the TSG, (the internal primary divert-
er) to operate correctly, it is essential that the
minimum requirements for upstream fusing
or circuit breakers be adhered to.
Table 1 summarises the minimum require-
ments for upstream fusing or circuit breakers
required to prevent nuisance tripping, or
operation of fusing when the TSG activates.
Upstream fusing and cabling may need
to be of higher capacity than the appear-
ance or size of filter would suggest.
Fusing of smaller capacity may experience
occasional nuisance tripping during surge and
transient conditions.
10kA 500A 100A 40A
15kA 750A 100A 63A
20kA 1000A 125A 80A
43kA 2000A 160A 100A
Table 1.
The table above summarises the minimum
requirements for upstream fusing or circuit
breakers necessary to prevent nuisance
tripping or operation of fusing when the
TSG primary surge diverter activates.
Max supply Typical supply Minimum Minimum
fault transformer circuit fuse size
current rating breaker
E535IS06ENAS 10/6/06 11:12 AM Page 13