Generator to fire pump feeds

[Jim Mang]

I have a project that required us to run the generator feed for the fire pump exposed through the parking garage of a structure. We installed a fused disconnect at the generator and pulled RHH conductors. Am I reading 695.6 B(3) wrong, that this becomes supply conductors and are not required to be encased by 2" of concrete. The generator feed is not the normal source of power for the fire pump we do have a transfer switch in the fire pump room.
Any suggestions would be appreciated, if I am wrong I need to fix this asap.

 

[M. D.]

(3) Be a listed electrical circuit protective system with a minimum 2- hour rating.

this is a link to the marking guide information FHIT

and this is a link to an EC&M article ,..I have no experience from which to draw I hope these help ,..good luck.

http://ecmweb.com/nec/electric_power_pump/

 

[M. D.]

I also found this , if you are useing the 08 there has been a change from a 1 hour to a 2 hour rating in regard to 695.6(b)(3)

NEC 695.6 (B) also has restrictions on the methods of routing electrical conductors from the service vault or the main service and to the fire pump controller. The fire pump feeders must be routed in one of the following methods:

• Feeders routed outside the building.
• Feeders encased in 2 in. of concrete.
• Feeders enclosed in construction dedicated to the fire pump circuit and with a minimum fire resistive rating of one hour.
• Be a listed electrical circuit protective system with a minimum fire rating of one hour.

Code officials have allowed mineral insulated (MI) cable and fire-rated RHH conductors in EMT to comply with the fourth listing above in lieu of routing the feeders outside the building or within 2 in. of concrete.

http://www.csemag.com/article/CA496122.html


This is a link to a very good article on this subject

http://www.iaei.org/subscriber/magazine/03_e/magazine_03e_berhinig.htm

 

[benaround]

M.D.,

Nice job !!!!!