Jump to content
Engineer Boards
Sign in to follow this  

NEC Fire Pump Requirements

Recommended Posts

Typically fire pump circuits are supplied by a tap made ahead of the main disconnecting means in the service equipment [per Article 230-82(5) of the 2008 NEC]. Per NEC Article 695-3(a)(1) the tap is not permitted in the same cabinet, enclosure, or vertical switchboard section as the service disconnecting means. So if the main service is supplied by a 2500kVA, 12470V-480Y/277V transformer (obviously not dedicated to the fire pump circuits) and the tap for the fire pump circuits is made as previously described, then the code permits overcurrent protectective devices to be installed ahead of the fire pump circuits in the power supply for either utility or customer-owned supply systems as long as these protective devices are selected or set to carry indefinitely the sum of the locked-rotor current of the fire pump motor(s) and the pressure maintenance pump motor(s) and the full load current of the associated fire pump accessory equipment. See Article 695-4 for verification of this requirement. So, my interpretation of the code is that Article 695-5 refers to transformers that are dedicated to the fire pump circuits (primary overcurrent protection only). Any insight into my interpretation would be greatly appreciated.

Edited by Bluekayak

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this