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A252 Portable Appliance Tester
It is strongly recommended that all sections of this manual are read and fully understood by all those
intending to carry out or supervise any activity involved in electrical safety testing using this test equipment.
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D0010024.DOC (01/01/94)
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Reasons for inspection and testing
Methods of construction for electrical safety
Test requirements to determine electrical safety
Safety test records
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Controls and Indicators
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Precautionary Measures
Visual Inspection
Electrical Safety Verification
Calibration
Operation Checks
Useful Addresses
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Page 1
INDEX
INSTRUCTION MANUAL
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Summary of Contents for Seaward A252
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Page 1: Table Of Contents
A252 Portable Appliance Tester INDEX It is strongly recommended that all sections of this manual are read and fully understood by all those intending to carry out or supervise any activity involved in electrical safety testing using this test equipment. -
Page 2: Introduction
A252 Portable Appliance Tester INTRODUCTION EASONS FOR NSPECTION AND ESTING In order to satisfy the objectives of the Electricity at Work Regulations 1989, there is a clear need for a structured programme of continual risk assessment for each and every item of electrical equipment in the workplace. - Page 3 A252 Portable Appliance Tester INTRODUCTION ETHODS OF ONSTRUCTION FOR LECTRICAL AFETY To provide the user with protection against electric shock general methods of construction must ensure firstly that all 'live' parts are insulated and secondly that should this basic insulation fail the 'live' parts are prevented from creating a hazard to the user.
- Page 4 A252 Portable Appliance Tester INTRODUCTION EQUIREMENTS TO ETERMINE LECTRICAL AFETY The most appropriate way of verifying electrical safety is to carry out a series of routine safety tests that both reflect those tests used in the manufacturing process and, particularly in the hire industry, that take into account the effects of normal wear and tear.
- Page 5 WARNING High current Earth Bond tests may cause damage if inappropriately applied to certain equipment. The A252 does incorporate a special low current (100mA) Functional Earth test for sensitive equipment. If in doubt, consult the manufacturer of the item before applying any test.
- Page 6 A252 Portable Appliance Tester INTRODUCTION LECTRICAL NSULATION To check the insulation, between the 'live' conductors (line and neutral) and all exposed metal surfaces, a high voltage a.c. Flash Test is applied. The voltage applied will be dependant on the construction class of the tool or appliance - •...
- Page 7 A252 Portable Appliance Tester INTRODUCTION NOTES All safety tests must be carried out with the supply switch of the tool or appliance in the ON position to ensure that all 'live' parts are included when checking insulation. Some specialised equipment with heavy duty motors etc. may employ contactor or relay start switching...
- Page 8 A252 Portable Appliance Tester INTRODUCTION AFETY ECORDS The recording of test results, to provide a traceable history of equipment worthiness, can also prove beneficial as a management tool for monitoring the effectiveness of the overall maintenance system, for reviewing test frequencies, and for asset tracking purposes etc.
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Page 9: Instrument Description
A252 Portable Appliance Tester INSTRUMENT DESCRIPTION A252 ORTABLE PPLIANCE ESTER D0010024.DOC (01/01/94) Page 9 INSTRUCTION MANUAL... - Page 10 A252 Portable Appliance Tester INSTRUMENT DESCRIPTION The CLARE A252 instrument is specifically designed to provide a quick and simple means of verifying the electrical safety of most commonly found Class I (Earthed) and Class II (Double Insulated) power tools and appliances.
- Page 11 NOTE If neither lamp glows, check that the supply is ON - if it is ON check the wiring of the A252 plugtop and fuse. Failing this, the fault is within the instrument. It must be withdrawn and thoroughly investigated and corrected, by qualified personnel, before carrying out any appliance testing.
- Page 12 A252 Portable Appliance Tester INSTRUMENT DESCRIPTION Flash Test PASS/FAIL lamps glow to indicate the result of the applied test. When applying a double insulated test via the flash probe a PASS indication should be taken to indicate that no fault was found at the point of application of the probe.
- Page 13 A252 Portable Appliance Tester INSTRUMENT DESCRIPTION Set Inf. These two controls, adjacent to the test selector, are multi-turn adjusters for setting-up the associated metering circuits. Select Earth Test or Functional Earth, plug the clip lead into the appropriate socket, this also selects the associated metering range, and isolate the clip. Depress the main Test button and adjust the Set Inf.
- Page 14 A252 Portable Appliance Tester INSTRUMENT DESCRIPTION Flash Test Probe this high voltage safety probe is used when applying the Flash Test, or taking Insulation Resistance measurements, with Double Insulated appliances. The test tip, which is exposed by depressing the red actuator on the probe handle, should be applied to any exposed metal on the appliance including screwheads and rivets etc and to casing joints, particularly around handgrips, switches and cable entries.
- Page 15 A252 Portable Appliance Tester INSTRUMENT DESCRIPTION Test Sockets the two sockets fitted as standard, 240V/13A (BS 1363A) and industrial 110V/16A (BS 4343), will suit most appliances found in the workplace environment. Equipment fitted with other plug styles can be readily accommodated by making and using suitable adaptors generally as illustrated below.
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Page 17: Appliance Test Procedures
A252 Portable Appliance Tester TEST PROCEDURES PPLIANCE ROCEDURES D0010024.DOC (01/01/94) Page 17 INSTRUCTION MANUAL... - Page 18 A252 Portable Appliance Tester TEST PROCEDURES RECAUTIONARY EASURES Appliance testing, by it’s very nature, can be hazardous and various common sense precautions should be observed - • Ensure that the person responsible for testing is competent and fully trained in the general principles of Safety Testing AND the correct use of any required test instruments.
- Page 19 A252 Portable Appliance Tester TEST PROCEDURES • Securely fix down motorised appliances and ensure that moving parts are adequately guarded. • Check that the intended test is suitable for the appliance - if in doubt contact the Manufacturer or Importer of the appliance.
- Page 20 A252 Portable Appliance Tester TEST PROCEDURES ISUAL NSPECTION Before applying the Earth Bonding and Insulation tests a thorough visual inspection of the appliance must be carried out. This may well form the greater part - 75% or more - of any test routine.
- Page 21 A252 Portable Appliance Tester TEST PROCEDURES LUGS AND USES Thoroughly check plug tops for damage and ensure that all wires are correctly connected. Ensure that cable grips and strain relief bushes are properly secure. Check that the correctly rated fuses are fitted - even a 5A fuse fitted in place of a recommended 3A fuse may give rise to a potentially dangerous fault condition.
- Page 22 A252 Portable Appliance Tester TEST PROCEDURES LECTRICAL AFETY ERIFICATION All safety tests must be carried out with the supply switch of the tool or appliance in the ON position to ensure that all 'live' parts are included when checking insulation - refer also to the NOTES in the Test Requirements section.
- Page 23 A252 Portable Appliance Tester TEST PROCEDURES WARNING • The high current of the Earth Test will cause a certain amount of self-heating, particularly if using the 25A circuit, to both the appliance wiring and the test circuitry. To keep this within acceptable limits and prevent overheating, do not apply an Earth Test for more than 5 seconds and do not apply more than two tests in any one minute period.
- Page 24 A252 Portable Appliance Tester TEST PROCEDURES LASH ARTHED PPLIANCES Although all tests can be applied independently it is advisable, when testing earthed equipment, to ensure that there is a satisfactory earth path BEFORE applying a Flash Test . Connect the appliance into the appropriate test socket and select the 1250V Flash Test.
- Page 25 A252 Portable Appliance Tester TEST PROCEDURES LASH OUBLE NSULATED PPLIANCES All tests must be carried out with the supply switch of the tool or appliance in the ON position to ensure that all 'live' parts are included when checking insulation - refer also to the NOTES in the Test Requirement section.
- Page 26 A252 Portable Appliance Tester TEST PROCEDURES @ 500 DC - E NSULATION ESISTANCE EASUREMENT ARTHED PPLIANCES Connect the test instrument to an Earthed supply and switch ON. Connect the appliance to be tested into the appropriate 110V or 240V socket and ensure that appliance switches are ON.
- Page 27 A252 Portable Appliance Tester TEST PROCEDURES UNCTIONAL ARTH EASUREMENT Connect the test instrument to an Earthed supply and switch ON. Connect the appliance to be tested into the appropriate 110V or 240V socket and ensure that appliance switches are ON.
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Page 29: Instrument Integrity
A252 Portable Appliance Tester INSTRUMENT INTEGRITY NSTRUMENT NTEGRITY D0010024.DOC (01/01/94) Page 29 INSTRUCTION MANUAL... - Page 30 A252 Portable Appliance Tester INSTRUMENT INTEGRITY ALIBRATION Regulatory Authorities require that test instruments are re-calibrated at least annually. CLARE offer a full calibration service for this instrument, although any other suitably approved test establishment can be used. PERATIONAL HECKS As well as undergoing annual, or more frequent, re-calibration by qualified personnel...
- Page 31 A252 Portable Appliance Tester INSTRUMENT INTEGRITY The Y250 FAULT SIMULATOR is supplied with the A252 specifically for this purpose, it can be used for checking both Earthed Appliance tests and Double Insulated Appliance tests. It is recommended that such checks are carried out weekly.
- Page 32 A252 Portable Appliance Tester INSTRUMENT INTEGRITY HECK ROCEDURE LASH RIPS With the clip lead still attached across the simulator terminals, select 500v Flash and depress the Test button. The green Flash PASS lamp should come on. Release the Test button.
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Page 33: Appendix
A252 Portable Appliance Tester APPENDIX PPENDIX D0010024.DOC (01/01/94) Page 33 INSTRUCTION MANUAL... -
Page 34: Useful Reference Material
A252 Portable Appliance Tester APPENDIX SEFUL EFERENCE ATERIAL The following short list of British standards, Legislative Documents and Guidance Notes is intended as a pointer to reference material that will assist in a greater understanding of the whys and wherefores of Electrical Safety Testing. - Page 35 A252 Portable Appliance Tester APPENDIX RITISH TANDARDS BS 415 Safety requirements for mains operated electronic apparatus for household and similar use. BS 2754 Construction of electrical equipment for protection against electric shock. BS 2769 Hand-held electric motor-operated tools. BS 3456 Safety of Household and similar electrical appliance.
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