Pure Foods Systems Ltd
Vending Machines, Water Coolers and Coffee Machines in the UK
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020 8401 6730
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0208 395 3071
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01428 707789
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PAT Safety Test Information Page 3
| 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.
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Telephone: 020 8401 6730 Fax: 0208 395 3071 - 01428 707789
E-mail: sales@purefoodssystems.co.uk