The "Construction_and_Maintenance" category was moved outside of the "Industries" subcategory. I believe the category you are looking for is now http://www.dmoz.org/Regional/Europe/United_Kingdom/Business_and_Economy/Construction_and_Maintenance/Contractors/Electrical/
Sites are removed from sight when they a) no longer match our guidelines (or maybe never had, and were listed in error), B) are moved to a more suitable category upon a re-evaluation or c) are marked as erroneous by either an editor or one of our automated link checking processes.
Please remember hat we do not do any status requests for suggestions/listings (see announcement).
Thank you windharp for your reply... In answer
A)It did meet the guidelines when first included it still matches guidelines..? (Having read the guidelines I could not find anything in them that was breached),
B)I have not found it in any other categories,
C)Wouldn’t it been marked erroneous by either automated link checking process or an editor before 9 years?
I understand status request and suggestion listing are not answered, This was already listed and had not breached any guidelines yet has been removed and was looking for an explanation because if I had done something (which I cannnot find…) It was ok for many years and is not now I would like not to make the a mistake if there was one again …? But not knowing why makes that near impossible..?