The IET Code of Practice
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IET Code of Practice: Inspection & Testing of Electrical Equipment – 5th Edition
The 5th edition (published 2020) of the IET Code of Practice for In-Service Inspection & Testing of Electrical Equipment details updated regulations, advice and guidance pertaining to checking whether in-service electrical equipment is fit for continued use.
Like the previous version, the 4th Edition, this book advises the following:
- Duty-holders should test equipment according to the risks it is exposed to, the environment it is used in, and the user’s skill level
- The importance of establishing and conducting safety checks as per current working practices and legal requirements
However, the 5th Edition of the IET Code of Practice for In-Service Inspection & Testing of Electrical Equipment has been updated with regards to the following:
- Duty-holders should test equipment according to the risks it is exposed to, the environment it is used in, and the user’s skill level
- Acceptable test result limits
- Hierarchy of tests
- Testing frequencies and intervals
- Demarcation between equipment connected to a fixed electrical installation and the installation itself
- Guidance and emphasis on user checks
- Advice on the types of checks available to duty-holders
Please see the table below for a detailed overview of the changes made to the 5th Edition.
| Changes from Edition 4 to Edition 5 | |
| 1.) | No recommended test period anymore |
| 2.) | Every class of equipment has to have a document Risk Assessment by the Duty Holder which sets out the period of testing |
| 3.) | All equipment will have an insulation resistance; the leakage test is now an additional test |
| 4.) | Leakage test is 5 milliamps for all equipment (class 1 or class 2) |
| 5.) | New class of equipment class 2 PE |
| 6.) |
All types of equipment have changed to:
|
| 7.) | No reference to Portable Appliance Testing |
| 8.) | New legal documents to refer to |
| 9.) | Fuse ratings have changed |
| 10.) | Different standard marks on the fuses themselves |
| 11.) | Rack-mounted equipment (server rooms) has been introduced |
| 12.) | New symbol for Class 2 PE |
| 13.) | Class 3 equipment has a visual, although not tested |
The 5th Edition of the IET Code of Practice for In-Service Inspection & Testing of Electrical Equipment provides revised and comprehensive guidance on how to achieve high standards of electrical safety.
IET Code of Practice: Inspection & Testing of Electrical Equipment – 5th Ed Key Feature
- Details updated regulations, advice and guidance pertaining to checking whether in-service electrical equipment is fit for continued use
- Reiterates that duty-holders should test equipment according to the risks it is exposed to, the environment it is used in, and the user’s skill level
- Emphasises the importance of establishing and conducting safety checks as per current working practices and legal requirements
- Electrical equipment maintenance requirements (updated)
- Acceptable test result limits (updated)
- Hierarchy of tests (updated)
- Testing frequencies and intervals (updated)
- Demarcation between equipment connected to a fixed electrical installation and the installation itself (updated)
- Guidance and emphasis on user checks (updated)
- Advice on the types of checks available to duty-holders (updated)
- Provides revised and comprehensive guidance on how to achieve high-standards of electrical safety
- These updated regulations and practices come into effect from October 2020
What’s Included?
- IET Code of Practice: Inspection & Testing of Electrical Equipment – 5th Edition
