first most like trades will be combined. if you have more than 1 type of electricians (power house or reg maint.) they will become just electrical. the same with mw,dm,p/f and the rest. at some plants they have many classifications for the same trade. there are only what 12 or 13 App. core trades. but at last check there were something like 91 classifications. this is going to be the first step.