What kind of bid are you referring to? There are many different approaches. If it were a residential house, apartment complex, competitive bid to several GC's, one of three bids to a single construction manager, commercial, industrial, design build. Each one warrants a different strategy. For a couple of examples:
Residential would basically state, underground (same side) or overhead service, light cans and trim by us, all other fixtures either by owner, or owner provided, installed by us. list any special loads that aren't clear on the plan, either included or excluded, and the a blanket statement per current NEC and local codes.
Design build I would give the criteria, without giving away the work (calculations, sizes, fixture design and layout) that they can use to find someone cheaper.
Commercial competitive, mostly the items like concrete, trenching, fire alarm etc., overtime, acceleration clauses, that I have included or excluded, and the blanket NEC statement.
To a Construction Manager that I know and who will scope out the work. As detailed as possible to give them a good idea of what is necessary to complete the project as needed. That way if you include things that others missed, the CM will know to ask in the scope meeting whether these items are covered.