Yes, that is correct. The current rules allow dual marking, but only on the condition that the metric quantities be given equal (or greater) prominence to English units.

As you point out, however, the dual-marking has been "granted" to us as a temporary derogation to allow us to continue using English units for a few more years. (How generous! [Linked Image] )

According to the powers-that-be, under EC Directive 99/103 (I think that's the number) it will be illegal to include non-metric units in any way from 2010. Metric only from then; English not even allowed as a supplementary indication. Who is being arrogant by forcing their system upon whom now?

But before we all get on our soapboxes too much again, please let's try to get back to the practical applications as they relate to electrical work.

How about the change of fixture threads on British device boxes as an example of harmonization for no good reason?

When the IEE decided to convert fully to metric, the fixing screws changed from 4BA (British Association) to 3.5mm.

Did that serve any useful purpose? I submit that it did not. You cannot argue that it helped with economy by harmonizing with Europe, because nowhere else in Continental Europe uses British-style boxes and devices.

All that happened was that the screws supplied with new devices would not fit the existing boxes. I still find homes where somebody has tried to install a replacement device using new screws and has jammed the threads up because the old boxes were 4BA threads.


[This message has been edited by pauluk (edited 09-11-2003).]