(1) The Secretary may include in any electrical code of practice a reference to—
if that official standard or, as the case may be, that part of that official standard relates to the subject matter of the code.
(2) On the inclusion in a code of a reference to an official standard or part of an official standard, that official standard or, as the case may be, that part of that official standard (as it existed on the date of the inclusion but with such additions or variations (if any) as are specified in the code) shall be deemed to form part of the code.