Iet Code Of Practice 4th Edition Pdf Free Download
- Iet Code Of Practice 4th Edition Pdf Free Download Free
- Iet Code Of Practice 4th Edition Pdf Free Download Utorrent
- Iet Code Of Practice 4th Edition Pdf Free Download Windows 7
- Iet Code Of Practice 4th Edition Pdf Free Download Pdf
Changes to the IET Code of Practice
The Code of Practice for In-Service Inspection and Testing of Electrical Equipment was first published in 1994 by the IEE, Institution of Electrical Engineers. By the time the 4th edition was published in 2012, the IEE had a name change to the IET, Institution of Engineering and Technology. We often get asked if it's okay to use an earlier version of the Code of Practice for the City & Guilds course, so I thought it would be useful to look at the changes that have been made to the guidance on PAT testing throughout the 4 editions.
Earth Continuity test
The long awaitied IET Code of Practice landed on my desk today and cost me £48.40. The previous editions came out in 1994,2001 and 2007; so only 5 years have elapsed since the last edition. There are a number of changes with the main one 'an explanation of the risk based assessment required to determine frequencies between inspection and testing'. Code of Practice for Electric Vehicle Charging Equipment Installation (3rd ed) The Code of Practice for Electric Vehicle Charging Equipment Installation provides a clear overview of EV charging equipment, as well as setting out the considerations needed prior to installation and the necessary physical and electrical installation requirements.
The 1st edition includes the standard (0.1 + R)Ω limit, but also has some additional limits: 0.5Ω including the supply cable for BS4533 Luminaires, and (0.5 + R)Ω for BS415 Mains Operated Electronic and Related Apparatus. In the 2nd edition the earth continuity table was dropped and the advice was a (0.1 + R)Ω limit for all equipment. There is no mention of flexing the the cable during the high current test in the earlier editions. The 3rd and 4th editions add the extra requirement that “the resistance measurement should be observed while flexing the cable.” Previously this was only a requirement for the low current tests in 1st and 2nd editions. The 3rd edition also introduces the terminology of ‘hard’ and ‘soft’ tests for the high and low current tests.
Insulation Resistance test
The limits for the insulation resistance test are quite different in the 1st edition than they are in later versions. The 1st edition gives limits for both class 1 and class 2 equipment in both ‘As New’ and ‘In-service’ condition The limit for ‘In-service’ for class 1 is 0.5MΩ, and the limit for ‘In-service’ for class 2 is 1MΩ and a variety of ‘As New’ limits depending on equipment type. In the 2nd edition this has been simplified to just 1.0 MΩ for class 1, 2MΩ for class 2, and 0.3MΩ for class 1 heating & cooking greater than 3kW. A new option of a 250V dc Insulation test voltage for sensitive electronic equipment is introduced in the 3rd edition.
Leakage Current test
Canon powershot s5 is software download. The 1st edition briefly mentions that the insulation resistance test may be substituted by an earth leakage measurement where the insulation test is not appropriate. It also gives an example of mineral insulated elements that may not meet the insulation resistance limits, and an earth leakage test could be used instead. There is no mention of the limits for leakage in this section, but Appendix IV on Routine Manufacturing Testing does give some limits: 3.5mA for Class 1 and 0.25 for Class 2.
In the 2nd edition a new section on leakage tests has been introduced: 15.6 Protective conductor / touch current measurement. This advises that it is used “as an alternative to the in-service insulation test for use if the insulation resistance test either cannot be carried out or gives suspect test results.” It also includes a table for the leakage limits.
The 3rd & 4th editions remain pretty much the same, however it now described as an “alternative or complimentary' test.
Substitute/Alternative Leakage Test
The substitute leakage test was first introduced in the 3rd edition in section 10.1. The previous versions have no mention of this test.
Labels
The advice on PAT labels was pretty consistent in the 1st, 2nd, & 3rd editions. “The date on which re-testing is due or the last test date and re-test period should be stated”. This seems like a sensible approach; a user can look at the PAT label and be able to determine if a re-test is due. In the 4th edition there was a complete u-turn on this. The new advice is “The date for re-testing should not be marked on the label”. The 4th edition was introduced after the Professor Löfstedt Report on health and safety legislation recognised that there was an over compliance in PAT testing. This was partially due to PAT contractors often putting annual re-test dates on all labels.
Frequency of testing
The Suggested Initial Frequency of Inspection and Testing of Equipment table remained unchanged in the 1st, 2nd, & 3rd editions. The general advice on the frequency of testing in the 4th edition has been expanded to emphasis the need for a risk assessment approach to determine the re-test frequency. The table on suggested initial intervals is still included, albeit with some minor changes to some of the periods. It also has some new rows for fixed equipment.
Microwave oven leakage
The 1st edition has a section on Microwave ovens (15.10). This states that microwave leakage (radiation) can occur if the oven is damaged or corroded but microwave leakage tests are normally only carried out after repair.
The 2nd edition gives some information on functional checks, but no mention of microwave leakage tests.
The 3rd edition recommends that “Microwave leakage should be checked at appropriate intervals”.
The 4th edition dropped the microwave section completely. The preface gives details that the microwave leakage testing is not within the remit of the CoP as it is not an electrical safety test and for this reason it has been removed.
RCDs
As far as I can see, there is no mention of RCDs in the 1st & 2nd editions. In the 3rd edition it states that “The RCD should be checked for correct operation by plugging it in, switching it on and then pushing the test button.” It also recommends that the trip time is measured. In the 4th edition the wording for the trip time test has been changed and is now a requirement: “timing tests should take place during the combined inspection and testing.” Table 15.5 on RCD operating characteristics has also been updated.
Production testing
The 1st, 2nd, & 3rdEppendorf 5424 service manual. editions all have a large section in the appendix dedicated to Production Testing. The reason given for its inclusion is that these tests may be required after the repair or refurbishment of equipment. In the 4th edition this entire section of the appendix has been dropped. The preface in the 4th edition explains “Production testing, previously included in this Code of Practice, has been removed as it is not relevant to in-service inspection and testing.”
Sections introduced in 2nd edition
The other notable additions to the 2nd edition are new sections on the Replacement of Appliance Flexes (15.13), and Plug Fuses (15.14)
Iet Code Of Practice 4th Edition Pdf Free Download Free
Sections introduced in 3rd edition
From a reader's perspectve, the 3rd edition is a big improvement on the 2 earlier versions. It now includes useful colour diagrams throughout. The colour illustrations in appendix VIII showing examples and information for the visual inspection are a good addition.
Sections introduced in 4th edition
The 4th edition has a new chapter - 16. This includes some useful information that was missing in previous versions on New Equipment (16.1), Second-hand Equipment (16.2), and Hired Equipment (16.3).
Purchasing the Code of Practice
Iet Code Of Practice 4th Edition Pdf Free Download Utorrent
If you are buying a copy of the Code of Practice for the City & Guilds PAT course, make sure you get the latest 4th edition; there are still some online retailers selling the old 3rd edition. The current C&G 2377-22 syllabus and exam is based on the 4th edition. The IET Code of Practice for In-Service Inspection and Testing of Electrical Equipment. 4th edition (ISBN 978-1-84919-626-0) , is available on Amazon here, or on our website here. Second hand copies sometimes come up on Ebay, but just make sure that all the pages are intact, the binding quality on the early print runs of the 4th edition was terrible, so many have missing pages.
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Iet Code Of Practice 4th Edition Pdf Free Download Windows 7
Iet Code Of Practice 4th Edition Pdf Free Download Pdf
There are a number of changes with the main one 'an explanation of the risk based assessment required to determine frequencies between inspection and testing'. Having spent the last few hours reading this document in detail and comparing it with the 3rd Edition, these are my observations on this point. (There will be further posts in the next few days on the other changes).
1. Table 7.1 has changed. There is the addition of Fixed Equipment to the table. In terms of frequency of testing this mostly fits in between IT and Moveable equipment, with some exceptions. In the main, the periods have been extended - ie more time between inspection and testing. For example, in factories the period for inspecting hand held Class I items has been relaxed from 1 month to 6 months.
2. There is a whole new section on 'risk-based assesments'. This uses wordy Health and Safety jargon to pass the responsibility for determining the frequency of inspection and testing to the duty holder. In Edition 3 of the COP this was explained more succintly as follows.
'Table 7.1 provides guidance on initial frequencies of inspection and testing. The frequency of inspection and testing depends on the factors above ie any circumstances that may affect the safety of the equipment'.
In my view, the relaxation in Table 7.1 is wholly negated by passing the buck to the duty holder. Any responsible duty holder is going to take a worst case view and test more frequently to be on the safe side of Health and Safety law.
3. Table 7.1 contains some anomalies.
3.1 If equipment used by the public is of Class I construction, then the advise is to carry out a Formal Visual Inspection weekly. However, if it is of Class II construction, then the advise is to only inspect it every 6 months. In my view, Class II equipment is likely to develop a frayed cable or a cracked plug just as easily as Class I equipment.
3.2 The same applies for schools with Class I equipment having to be inspected every 6 months, but Class II equipment only every 12 months.
3.3 Items supplied to guests in hotels is to be classed as equipment used by the public. (This was the same in Edition 3). Table 7.1 requires these items, such as hairdryers, fridges and kettles to be formally visually inspected every week and the results recorded ! Most hotels would see their profits disappear in a mountain of paperwork. In my view there was an opportunity to correct this in Edition 4 which has been missed.
In summary, although much seems to have changed in the 4th Edition and I have been parted from my hard earned £48.40, in essence, nothing has changed. It is still upto the duty holder to work out the frequency of inspection and testing in their workplace.