Every job we bid has specifications. Quite often, specific light fixtures are called for, or they want you to do more than 'code minimum.'
As an example, one job I am currently doing specifies steel fittings with plastic bushings - rather than the usual die-cast zinc. Some of the wire sizes called out are also larger than 310.16 would require.
So- here's the question:
Assume you've lost a bid. Do you re-visit the job to verify the 'cheap guy' is meeting the requirements of the job? Or, do you leave it to the customer to enforce his plans?
Leave it to the customer to enforce his plans.
What might be done is to submit two quotes, with the second one proposing certin changes to control costs, this will usually make them aware, the cost can be controlled, and at the same time, draw their attention to the higher specs. in the bid.