517.34(C)

[mshields]

Is it me or is this section requiring non-delayed equipment power for accessories essential to generator operation in direct conflict with 517.32(E).

I can tell you that in practice, these loads go on the Life Safety system.

 

[Pharon]

The only genset accessories allowed on Life Safety are task lights and receptacles. The other stuff should go on Equipment Branch.

517.32(E) Generator Set and Transfer Switch Locations. Task
illumination battery charger for battery-powered lighting unit(s) and
selected receptacles at the generator set and essential transfer
switch locations. [99:6.4.2.2.3.2(4)]

517.34(C) AC Equipment for Nondelayed Automatic
Connection. Generator accessories, including but not limited to, the
transfer fuel pump, electrically operated louvers, and other
generator accessories essential for generator operation, shall be
arranged for automatic connection to the alternate power source.
[99:6.5.2.2.3.2]

 

[mshields]

actually I meant to say 517.32(F)

actually I meant to say 517.32(F)

I Mis-typed i.e. the conflict I noticed is between 517.34(C) and 517.32(F), clearly listing fuel pumps, louvers and other things listed in 517.32(F).

These things were added in 2014. It's almost like they added them but neglected to remove them from 517.34.

Also, where is "Nondelayed" defined. Typically, we'd set the EQ ATS to transfer in 60 seconds. Who puts in a separate transfer switch to operate at 10 seconds (which I assume is nondelayed criteria) for just the things listed in 517.34(C)?

 

[Pharon]

Ah, good point. Looks like they forgot to delete them from the Equipment Branch when they added them to Life Safety. I guess per the 2014 Code, you have the option to add them to either.

As for a non-delayed Equipment Branch switch, I think it means just that -- an ATS with no delay. The only reason you would need a delay is to prevent a huge voltage dip on startup or to allow motors to cycle down safely before restarting them. But if you have neither of those problems, there's no reason for a delay setting. I can't think of an example where you'd have an EB switch with no delay, but I'm sure they exist somewhere. At the very least, you'd want the Code to allow you that option.

 

[mshields]

thanks

thanks

and by the way - do you happen to know if there is a way to say thanks without posting another reply?

 

[John120/240]

and by the way - do you happen to know if there is a way to say thanks without posting another reply?

There was a thread not too long ago that addressed this. It didn't pass muster I guess. If you want to say thanks to a member for exceptional advice use a Private Message.