13
Flowchart for secure isolation procedure. All the off-cuts conduit, trunk-
ing and tray also into the skip.
environment produces? Well, all the packaging material for electrical fit-
tings and accessories usually goes into either your employer’s skip the
skip site designated for that purpose.
. fact, most the general site debris
will probably into the skip and the waste disposal company will take the
skip contents designated local council land fill area for safe disposal.Safe systems working
173
Select approved test lamp or
voltage indicating device
Verify that the device is
functioning correctly a
known supply proving unit
Satisfactory?
Locate and identify circuit or
equipment worked upon
Is the
circuit equipment
in service?
Identify means isolation
Ensure isolation circuit or
equipment by
– switching off
– withdrawing fuses
– locking off isolating switches
or MCBs
Verify that the circuit or
equipment worked upon is
dead using voltage indicating
device testing between
Phase and Earth
Phase and Neutral
Neutral and Earth
Satisfactory?
Recheck that the voltage
indicating device functioning
correctly known supply
or proving unit
Fit warning labels
Satisfactory?
DEAD
Discover why with care
and through the
procedure again
Replace repair
and through
the procedure
again
Begin work
NO
Replace repair
Establish where and why
it was de-energised
NO
YES NO
LIVE
YES
YES
FIGURE 8
