Isolate the supply and observe that the test device now reads 0V. Connect the test device the supply which isolated; this
should indicate mains voltage.10) and you should isolate and lock off before work
begins.11 is
used prove conductors dead, Regulation 4(3) EWR 1989 recommends
that the following procedure should adopted that the device itself is
‘proved’:
FIGURE 1.
2.
4. Every circuit must provided with means isola-
tion (Regulation 132. Lock off the supply and place warning notices.
3.
Temporary electrical supplies construction sites can save many per-
son-hours labour providing energy for fixed and portable tools and
. Only then should
work commence the ‘dead’ supply. 1.
Electrical isolation supplies further discussed Chapter of
this book. Where
a test instrument voltage indicator such that shown Fig.11
Typical voltage indicator.
Safety First
Working ‘Live’
● NEVER work‘live’
● ALWAYS isolate first
● SECURE the isolation
● PROVE the supply‘dead’before
starting work.28
Basic Electrical Installation Work
is first switched off.
The test device must incorporate fused test leads comply with HSE
Guidance Note 38, Electrical Test Equipment Used Electricians. Connect the test device another source supply ‘prove’ that
the device still working correctly. order deter anyone from reconnecting the supply, ‘Danger
Electrician Work’ sign should displayed the isolation switch.
1
