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PAT Safety Test Information Page
2
Test
criteria (Page 1) / (Page
2) / (Page 3)
The procedures for portable Appliance safety testing require
that electrical tests be carried out upon the appliances to
confirm the integrity of the earthing and insulation. To simplify
this task a competent person can use a portable appliance
tester (PAT) to perform these tests safely. The unit under
test is plugged into the socket on the front of the PAT Some
testsare carried out through the plug. others through the
plug and an auxiliary probe to the casing of the appliance.
2 basic tests are offered by all PATs and up to 4 optional
tests are available on some PATs. The 2 basic tests offered
by aill PATs required for testing Four Square equipment are;
Earth bond test
Applies a substantial test current, typically around 25 A,
down the earth pin of the plug to an earth probe which should
be connected by the user to any exposed metalwork on the casing
of the unit under test. From this the PAT determaines the
resistance of the earth bond. (This test is for class I- earth
appliances) For Four Square equipment a pass level of <0.1
ohms Is recommended.
Insulation test Applies a test voltage, typpically 500 V DC,
between the live and neutral bonded together and earth, from
which the insulation resistance is calculated by the PAT.
For Four Square equipment a pass level of >2 M ohms is required.
Those tests that are commonly available on the testers that
are not required for the routine testing of Four Square equipment
and may adversely affect the life of the equipment are;
flash test load test operation test earth leakage test Test
instructions
1) Visual inspection. Inspect for any signs of damage or deterioration
of casing, plugs, terminals and cable sheath. Check the plug
for correct fuse rating. Check for correct wire connections
if the plug is of the non moulded on type.
2) Earth bond test. Follow the PAT manufacturer's instruction
for the particular PAT being used. If a choice of pass level
setting is available use a setting which allows a resistance
of up to O.I ohms. In general, the PAT will for this test
require you to connect an auxiliary lead from the PAT to each
metal part of the casing of the machine under test. Suitable
points to attach the auxiliary lead to dependent on the type
of Four Square equipment are described below.
Ensure that the door is closed and any on/off switches are
in the on position on the equipment under test. Note: Care
must be taken with this test to ensure suitable contact between
the lead and the metal of the item under test, bearing in
mind the possible resistance of paint etc.
3) Insulation test. Follow the PAT manufacturer's instruction
for the particular PAT being used. The PAT will only carry
out this test if the earth bond test above gives a satisfactory
result. If a choice of pass level setting is available use
a setting which requires a resistance of >2 M ohms.
| PAT
Testing Points |
| Assembly |
Suitable attachment points |
| Cabinet |
For testing from behind machine. Any exposed
metal surface. From in front the of machine, the baseplate. |
| Door |
Machine may be tested with door open as
all 240v mains are still in circuit. For machine test
use the earth braid post between the door and cabinet,
the coinmech bracket or the front panel earth post.
Test on the coinmech bracket. |
| Hot Tank |
Using a probe test on any exposed metal
surface of the tank body and cover. |
| Chiller |
Connect to any exposed metal surface on
the chiller chassis or casing. |
| Lamp & Ballast |
Use the earth connector on the fluorescent
tube-mounting panel adjacent to the door stay clip. |
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Telephone: 0845 689 0096
Fax: 0200 0114 775
E-mail: sales@purefoodssystems.co.uk
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