Electricity + Control January 2016

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ROUND UP EARTHING + LIGHTNING PROTECTION
Going up… surge protection for lifts
Modern day lifts fulfil several sophisticated functions which can only be fulfilled by
means of highly sensitive electronic systems. Although lift manufacturers take vari-
ous measures to reduce bulk current injection into the lift cabling and technology to
an acceptable level – be it with shielded metallic distribution boards or the type of
cable routing or cables used – these measures cannot prevent conducted transients
from damaging the lift. DEHNguard is a complete prewired unit that consists of a
base part and plug-in protection modules. It has a high discharge capacity due to its
heavy-duty zinc oxide varistors or spark gaps, and offers reassuring reliability due
to its ‘thermo dynamic control’ SPDmonitoring device.This modular surge arrester
is ideal for use inTTTN-C andTN-S systems.The big advantage of theTT earthing
system is that it is clear of high and low frequency noises that come through the
neutral wire from connected has always been preferable for special
applications like telecommunication sites that benefit from the interference-free
earthing. Also,TT does not have the risk of a broken neutral. DEHN's BLITZDUCTOR
XT family offers optimal protection of two single and the cable shield (BSP and
BXT).These space-saving combined lightning current and surge arrester modules
offer the LifeCheck feature, which detects thermal or electrical
overload, at which time the arrester has to be replaced.This
status is indicated by the DEHNrecord reader. A four-pole
version, for universal use with all types of BSP and BXT/
BXTU protection modules, is also available, which offers no
signal interruption if the protection module is removed.The
BLITZDUCTOR XT is for use in the lightning protection zone
concept at the boundaries from 0 A-2 and higher.
Enquiries: Alexis Barwise.Tel. 011 704 1487
or email
or visit
Device protection without
back-up fuses
The new type 3 surge protection Plugtrab PLT-SEC
from Phoenix Contact features a newly developed
disconnect device. The devices provide increased
safety in the case of electrical
and thermal overload, regard-
less of the backup fuse installed.
Thanks to the Safe Energy Con-
trol technology, the protective
devices are particularly durable.
The protected end devices are
subject to less strain than in
standard installations.
Owing to the integrated,
surge-current-proof fuses, remote installations do
not require any external protective device backup
fuses. The surge protective devices are used in
applications with load currents of up to 26 A.They
are suitable for ac and dc applications. Recurring
inspections of the protective devices are carried
out quickly and easily with the Checkmaster 2 test
device. The easy-to-read status indicator and the
floating remote indication contact keep you in-
formed about the status of the product at all times.
Enquiries:Tony Rayner.
Email
SEC Surge Protection.pdf 1 2015/09/03 08:19:05 AM