DG Appliance Testing Services
Testing Procedure
Testing in Cyprus
Testing in the UK
Legal Requirements
Equipment to Test
Testing Procedure
Equipment Types
Book a
Pat Test
Pat
Pricing
Visual checks
The
appliance will be checked to ensure it is good working order and has no
signs of damage
which could result in access to live
parts The suitability of equipment for the environment and
nature of the work undertaken will also be considered, location of cables and ease of
isolation
from the mains supply. The flexible cable is in good
condition and not too long or short
causing trip hazards, and no signs
of cuts, fraying or damage. Remove the plug top and check
the cable is secure in the cord anchorage, no signs of overheating and the plug is correctly
connected, if
the plug is of the non-rewirable type, the cable grip should be tested by
firmly
pulling and twisting the cable, no movement should be apparent.
Earth Continuity tests (class 1 only)
Earth continuity testing may in
certain circumstances be carried out by a low resistance
ohmmeter. This
may be either a specialised low resistance ohmmeter, or the continuity
range
of a combined insulation and continuity tester. The test current be
a.c. or d.c., but should be
derived from a source with an open-circuit
voltage of not less than 100mV and no greater than
24 Vote test current
should be within the range 20 to 200 mA.
Insulation Resistance
Apply a voltage typical Vdc
between live and neutral conductors and measure the resistance
between
live and neutral and the safety conductor (earth). The resistance is
measured in
Meg Ohms and should be within the guidelines for each
particular appliance tested, shown in
the regulations issued by the IEE.
Leakage Test
During normal running operational
voltage(230 Vac) the resistance is measured between live,
neutral and the
safety conductor (earth). The resistance is measured in ohms and should be
within the guidelines for each particular appliance tested shown in the
regulations issued by
the IEE. This test is to determine the
deterioration of the appliance within its in-service lifetime.
Some
sensitive equipment like IT equipment might not be tested.
FUNCTIONAL TEST
The appliance should operate at
normal Voltage and conform to all its original manufactures’
specifications.
POLARITY TEST (on extension leads and IEC leads)
A Voltage of 40 Vac is applied to
all conductions (live, neutral and earth) via the plug top and
monitored at
connector to ensure that all three conductors are correct. This test is
to check for
incorrect wiring.