Ralph et al
A lawyer could have a field day with this sort of thing (at considerable
expense!).
The standards we all use from day to day are merely methods of demonstrating
compliance with the law of the land i.e. (in Britain) the statutory
instruments, passed by Parliament, which implement the EMC, machinery or low
voltage directives issued by Brussels. 
In themselves the standards have no basis within law whereas the statutory
instruments do. Thus in Britain statutory instrument 1992 No. 2372 (which
implements the EMC directive) refers to "protective requirements" i.e. that
"your equipment shall not interfere with nor be affected by somebody else's
equipment, providing it is reasonable to use them in the same environment"
(I paraphrase the wording). 
The equipment shall be "fit for purpose" and only you the manufacturer
together with your customer know what is "fit for purpose" i.e. what
deviations in performance are acceptable, other than destruction of the
product. Hence you decide if the equipment is Class A, B or C with respect
to immunity and whether or not this is acceptable. 

Ian Gordon

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