Emergency generator question

[hhsting]

I have drawings that say emergency diesel generator that says has 22 hour 660 gallon sub base tank.

I want to verify if 22 hours 660 gallon sub base tank is per code. Does NEC 2017 say anything regarding how long should the generator run in hours etc?

 

[don_resqcapt19]

See 700.12(B)(2), but note that some building codes require a larger fuel supply than what the NEC requires.

 

[augie47]

The requirements also vary dependent on the facility served.
Hospital codes I believe can be a minimum of 24 hrs
COPS facilities for 72 hours.(708.22)

 

[rambojoe]

660g is more like 4 days...

 

[hhsting]

The requirements also vary dependent on the facility served.
Hospital codes I believe can be a minimum of 24 hrs
COPS facilities for 72 hours.(708.22)

This is a high rise buildings with shops at bottom, garage, pool and condos up top.

 

[hhsting]

660g is more like 4 days...

This is for high rise with condos up top, commericial shops bottom, garage bottom and pool.

Generator is outdoor with 450kw/562kva at 480/277V three phase.

 

[don_resqcapt19]

660g is more like 4 days...

Based on post 6, the generator would use between 25 and 30 gallons per hour at full load, and 20- 25 gallons per hour at 75% load.

 

[don_resqcapt19]

This is for high rise with condos up top, commericial shops bottom, garage bottom and pool.

Generator is outdoor with 450kw/562kva at 480/277V three phase.

The NEC only requires 2 hours of onsite fuel. You need to look at other codes that may require more.

 

[roger]

This is for high rise with condos up top, commericial shops bottom, garage bottom and pool.

Generator is outdoor with 450kw/562kva at 480/277V three phase.

Doubtful it is really classified as an emergency (article 700) Generator. The egress lighting and alarms may be on a separate ATS with load shedding though

 

[rambojoe]

Based on post 6, the generator would use between 25 and 30 gallons per hour at full load, and 20- 25 gallons per hour at 75% load.

Sweet. If you say so.