Fire Pump Maintenance

[richxtlc]

We have a fire pump that is directly connected to the secondary of a 150kVA transformer. The HRC is over 4. Is there any safe way of taking measurements during a test of the fire pump other than installing a remote monitoring device for current and voltage measurements.

 

[zog]

We have a fire pump that is directly connected to the secondary of a 150kVA transformer. The HRC is over 4. Is there any safe way of taking measurements during a test of the fire pump other than installing a remote monitoring device for current and voltage measurements.

Not really, wondering how you get over HRC 4 from a 150kVA transformer, that dosent sound right.

 

[richxtlc]

the ocpd is for short circuit protection only, the fire pump protection must be able to keep the fire pump running indefinitely at LRC.

 

[zog]

the ocpd is for short circuit protection only, the fire pump protection must be able to keep the fire pump running indefinitely at LRC.

I understand that, done many studies on fire pump systems, still wondering how you got HRC 4 out of a little 150kVA transformer. TO answer your OP, either inrease the working distance with hot sticks or reduce your clearing time using an arc flash reduction switch.

 

[richxtlc]

thanks, I'll look into the arc flash reduction switch. They will probably go with a remote monitoring for current and voltage as the inspector need to take reading during the test of the fire pump system.

PS. I didn't do the AF hazard evaluation, I'm just going by what the tag says.

 

[zog]

That is your best bet.