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Download Portable Appliance Testing: In-Service Inspection and by Scaddan B. PDF

By Scaddan B.

The electrical energy at paintings rules 1989 require any electric method to be built, maintained and utilized in one of these demeanour as to avoid probability. which means inspection and trying out of platforms, together with transportable home equipment, is required with a view to verify if upkeep is required.This ebook explains in transparent language what has to be performed and contains specialist recommendation on laws in addition to real trying out. The publication includes an appendix supplying basics wanted via non-specialists and in addition has pattern questions (with solutions) for the C&G 2377 examination that any one who conducts this paintings is needed to take via law.It is a reasonable and convenient reference for electricians who administer PAT. it's also an amazing refesher and revision consultant for the non-specialist, equivalent to upkeep employees, caretakers and charity store volunteers who perform those initiatives part-time, along their many different tasks.

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Additional info for Portable Appliance Testing: In-Service Inspection and Testing of Electrical Equipment

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Resistance This is the opposition to the flow of current in a conductor determined by its length, cross-sectional area and temperature. 43 44 PAT: Portable Appliance Testing Power This is the product of current and voltage, hence P ϭ I ϫ V. RELATIONSHIP BETWEEN VOLTAGE, CURRENT AND RESISTANCE Voltage ϭ Current ϫ Resistance V ϭ I ϫ R, Current ϭ Voltage/Resistance I ϭ V/R or Resistance ϭ Voltage/Current R ϭ V/I. COMMON MULTIPLES OF UNITS Current I amperes kA Kilo-amperes 1000 amperes mA Milli-amperes 1/1000 of an ampere Voltage V volts kV Kilovolts 1000 volts mV Millivolts 1/1000 of a volt Resistance R ohms MΩ Megohms 1 000 000 ohms mΩ Milli-ohms 1/1000 of an ohm Power P watts MW Megawatt 1 000 000 watts kW Kilowatt 1000 watts RESISTANCE IN SERIES These are resistances joined end to end in the form of a chain.

34 Ω. 75 mm2. The test instrument also indicates a ‘fail’ condition. Can the result be overruled? 1 Ω, so, yes, the appliance is satisfactorily earthed, and the test reading can be overruled to ‘pass’. 34 Ω and hence a ‘fail’ status. ). Having made the above comments, it must be said that only low-power appliances with very long cables having small size conductors cause any problems. Combined Inspection and Testing 27 Conducting the earth continuity test Portable appliance tester Having conducted the preliminary inspection: ■ Plug the appliance into the tester and select, if possible, a suitable current.

34 Ω and hence a ‘fail’ status. ). Having made the above comments, it must be said that only low-power appliances with very long cables having small size conductors cause any problems. Combined Inspection and Testing 27 Conducting the earth continuity test Portable appliance tester Having conducted the preliminary inspection: ■ Plug the appliance into the tester and select, if possible, a suitable current. 5 times the fuse rating (if the correct fuse is in place) up to a maximum of 25 A. ■ Connect the earth bond lead supplied with the tester to a suitable earthed point on the appliance.

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