7 / 28
HomeSafe Product Guide 7
Safety First
Surge Protection
At a UK Electrical safely council seminar in 2011, London
Fire Brigade highlighted an increase in the number of house
jQDR VGDQD @ BNMRTLDQ TMHS V@R SGNTFGS SN G@UD ADDM SGD
RS@QSHMF ONHMS NE SGD jQD (S V@R QDONQSDC SG@S ONNQ HMRS@KK@SHNM
NQ L@HMSDM@MBD Q@SGDQ SG@M OQNCTBS PT@KHSX QDRTKSDC HM @ jQD
in the consumer unit.
The current IEC product standard does not currently
L@MC@SD SGD DMBKNRTQD L@SDQH@K jQD Q@SHMF OQNODQSHDR (M
more recent studies it is clear that many consumer unit
AQ@MCR CN MNS NEEDQ RTBG jQD Q@SDC L@SDQH@K SDBGMNKNFX @R
standard. In the cases highlighted by London Fire Brigade,
SGD DMBKNRTQD ADBNLDR @ ETDK RNTQBD ENQ SGD jQD
Havells consumer units are manufactured using 960ºC
jQD Q@SDC L@SDQH@K &HUDM SGD ONSDMSH@K KNB@SHNM HM @
GNLD @MC JMNVHMF SG@S HS HR CHEjBTKS SN DMRTQD SG@S DUDQX
BNMRTLDQ TMHS HR BNQQDBSKX L@HMS@HMDC @ GHFG RODBHjB@SHNM
jQD QDS@QC@MS L@SDQH@K RNKTSHNM HR TRDC NM BNMRTLDQ TMHSR
and modular enclosures.
The Havells HomeSafe solution combines high quality
consumer units with best-in-class Furse SPDs designed
to deliver optimal, long lasting protection for all electrical
equipment in the home.
3GHR CNBTLDMS BDQSHjDR SG@S SGD %TQRD ,,/ " 2/#
has been installed on a Havells HomeSafe consumer unit
in accordance with best practice principles to IET Wiring
Regulations 17th Edition, BS 7671:2008(+A1:2011) and tested
to achieve the voltage protection levels (
U
p ) shown below.
Sensitive electrical equipment in the home may require
protection against transient overvoltages (surges) due to
atmospheric origin where these overvoltages would exceed
SGD VHSGRS@MC UNKS@FD NE SGD DPTHOLDMS @R CDjMDC AX SGD
IET Wiring Regulations 17th Edition, BS 7671:2008(+A1:2011),
and Lightning Protection standard, BS EN/IEC 62305.
3Q@MRHDMS RODBHkB@SHNM @S 2/# SDQLHM@KR
Voltage protection level
U
p at
U oc
of 6 kV 1.2/50 μs and
I sc
of 3 kA 8/20 μs (per mode)
0.9 kV
1
1
The maximum transient overvoltage let¬through the SPD throughout the test (±5%), phase to neutral, phase to earth and neutral to earth.
3Q@MRHDMS RODBHkB@SHNM HMRS@KKDC ODQENQL@MBD m 2/# SN 'NLD2@ED TMHS
Target voltage protection level Up: (Withstand voltage, Category I equipment to BS 7671)
1.5 kV
L-N: Voltage protection level
U
p at
U oc
of 6 kV 1.2/50 μs and
I sc
of 3 kA 8/20 μs (per mode)
1.09 kV
2
L-PE: Voltage protection level
U
p at
U oc
of 6 kV 1.2/50 μs and
I sc
of 3 kA 8/20 μs (per mode)
1.18 V
2
N-PE: Voltage protection level
U
p at
U oc
of 6 kV 1.2/50 μs and
I sc
of 3 kA 8/20 μs (per mode)
796 V
2
All testing performed in accordance with IEC 61643-11 Class III test 6 kV (1.2 μs voltage) 3 kA (8/20 μs current) for verifying SPD transient overvoltage
protective performance at terminal equipment level.
2
Typical values, subject to manufacturing component tolerances. Essential detail relates to voltage protection level Up <1.5 kV for effective protection of
SGD HLLTMHSX VHSGRS@MC NE "@SDFNQX ( DPTHOLDMS @R CDjMDC AX !2 2DBSHNM 3@AKDR