17th edition IEE wiring regulations : inspection, testing by Brian Scaddan

By Brian Scaddan

This well known advisor clarifies the necessities for inspection and checking out, explaining in transparent language these components of the Regs that almost all want simplifying. as well as the standard descriptive and diagrammatic try out tools which are required, causes of the speculation and reasoning at the back of attempt approaches are given, including precious tables for attempt effects comparability. The booklet additionally presents crucial details at the final touch of electric install certificate, with a step by step advisor at the entries that have to be made and the place to resource data.

It is an inexpensive reference for all electric contractors and different employees thinking about inspection and trying out of electric installations. it's going to resolution queries fast and support be sure paintings complies with the most recent model of the Wiring Regulations.

With the assurance rigorously matched to the syllabus of town & Guilds certificate in Inspection, trying out and Certification of electric Installations (2391-10) and basic Inspection, checking out and preliminary Verification (2392-10) and containing a pattern paper and advised strategies, it's also a great revision guide.

Brian Scaddan, I Eng, MIET, is a specialist for and an Honorary Member of urban & Guilds. He has over 35 years’ adventure in additional schooling and coaching. he's Director of Brian Scaddan affiliates Ltd, an authorized urban and Guilds and NICEIC education centre providing classes on all facets of electric set up Contracting together with the C&G 2391 and 2392 sequence. he's additionally a number one writer on books on electric install.

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Additional info for 17th edition IEE wiring regulations : inspection, testing and certification

Sample text

Then test between each of the lines. Alternatively, test between each of the live conductors in turn. Installations incorporating two-way lighting systems should be tested twice with the two-way switches in alternative positions. 1 gives the test voltages and minimum values of insulation resistance for ELV and LV systems. If a value of less than 2 M Ω is recorded it may indicate a situation where a fault is developing, but as yet still complies with the minimum permissible value. In this case each circuit should be tested separately in order to locate the problem.

A schedule of test results and a schedule of inspections must accompany an EIC. SEQUENCE OF TESTS The IEE Regulations indicate a preferred sequence of tests and state that if, due to a defect, compliance cannot be achieved, the defect should be rectified and the test sequence started from the beginning. The tests for ‘Protection by separation’ and ‘Insulation of non-conducting floors and walls’ all require specialist equipment and in consequence will not be discussed here. Continuity of protective conductors.

What is the correct sequence for carrying out the tests? Which test is not normally required for an initial verification? The details of which sections of BS 7671 are required to be made available to a person carrying out inspection and testing of an installation? What inspection checklist item relates to damage to cables? (3), (4), (2), (1). Voltage drop. 131, 311, 312, 313. Routing of cables. 21 This page intentionally left blank CHAPTER 3 Testing Continuity of Protective Conductors (Low-Resistance Ohmmeter) Important terms/topics covered by this chapter: ▪ Protective bonding conductors ▪ Circuit protective conductors ▪ Parallel earth paths ▪ (R1 + R2) values By the end of this chapter the reader should, ▪ know what test instrument to use, ▪ understand the importance of disconnecting protective conductors for testing, ▪ know the importance of isolation, where protective conductors cannot be disconnected, ▪ be aware of the effects of parallel earth paths, ▪ be able to determine the approximate value of a protective ­conductor, given its length, ▪ know the preferred method of cpc continuity testing, ▪ know why (R1 + R2) values are important.

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