The first consideration should be is the work you do within the scope of BS 7671. So you need to read regulations 110.1 (things that are in) and 110.2 (things that are out).
110.2 (xi) excludes "Electrical equipment of machines covered by BS EN60204".
Next, if your work is within the scope of BS 7671, do you need an upgrade course? This can be turned into a very difficult question
. The simple answer, for most, is do an update course and avoid any hassle that may come from not having done one (BTW - I do (occasionally) teach these courses - so I would say that wouldn't I
).
Should you do a course if your work comes with in the scope of the EWR? - IMO only if your work is within the scope of BS 7671.
Note that compliance with BS 7671 does not guarantee compliance with the EWR - it is only LIKELY to achieve compliance for electrical installations that are within the scope of BS 7671.
Finally - I have completed a 16th Edition course, and work to the 16th was considered to be safe, so there is no need to upgrade - ah, that old chestnut
.
Well let's look at it in terms of the EWR (similar arguments can be used for domestic work) - I said above that BS 7671 is LIKELY to achieve compliance with the EWR - so when might it not?
Well take Regulation 8 - this basically says that you must not electrocute people. BS 7671 bases some of its shock protection requirements on the data in IEC 479 (BS PD 6519). This contains the data to produce the 'famous' touch voltage curve. Now this curve only claims to provide protection for a percentage of the population (factors such as health etc come into this), but EWR 8 is absolute and does not accept that some people can be electrocuted
.
There is a defence in Regulation 29 in which, provided you can prove that you "took all reasonable steps and exercised all due diligence to avoid commission of that offence" - you MAY get off
.
Now, (and this is the punch line) - the 17th Edition has changed the way disconnection times are applied and has altered some of the timings. This is to improve safety and so it should mean that a 17th Edition installation is "safer" than a 16th Edition one (not a lot - just a bit
).
Explain to the judge how not knowing about this meets the defence regulation .