I have an electric fire pump whereby the contractor wants to use a diesel fire pump for the backup. I don't know why and I've never seen a setup like this before. Usually I always get electric fire pump with generator backup. Nevertheless, it appears that this is permitted.
Question has to do with the transfer of power. The only thing I can point to is Article 700 (NEC 2017) which states that the emergency system cannot take more than 10 seconds. Is this even possible with a [primary] electric-driven fire pump with a [backup] diesel engine fire pump?
ANY thoughts or opinions would be helpful at this point.