Hi all, I admit I've been somewhat of a lurker here for awhile and am always adding to the the old brain files anytime I do. I admit though that I've been stumped a job for a few days now and could really use some advice.
I have been tasked with moving an existing installation from one building to another but leaving the original distribution equipment in place for potential future use. I was told to just replicate what is being used today on the new install. Being who I am, I started double checking the original install and I'm not sold that it is correct and despite scouring code and forum posts I cannot find a concrete answer.
The old system is using a 15kVa 480 to 240/120 transformer supplying a panel. Out of that panel the heavy hitters are two UPS along side a handful of general circuits. For the UPS one is a 240V 10kVa and the other is a 120V 3kVa.
My big question is regarding the tranny sizing. Do I need to size based on load or do I need to size based on the input rating of those UPS? If based on load then I should be fine matching the old setup however if based on max input rating of the UPS then I'm cutting things short, especially when the supplemental circuits are factored in. For the record, I'm seeing about 35% average load reporting on both UPS over the last few days.
Any insight here would be greatly appreciated!
I have been tasked with moving an existing installation from one building to another but leaving the original distribution equipment in place for potential future use. I was told to just replicate what is being used today on the new install. Being who I am, I started double checking the original install and I'm not sold that it is correct and despite scouring code and forum posts I cannot find a concrete answer.
The old system is using a 15kVa 480 to 240/120 transformer supplying a panel. Out of that panel the heavy hitters are two UPS along side a handful of general circuits. For the UPS one is a 240V 10kVa and the other is a 120V 3kVa.
My big question is regarding the tranny sizing. Do I need to size based on load or do I need to size based on the input rating of those UPS? If based on load then I should be fine matching the old setup however if based on max input rating of the UPS then I'm cutting things short, especially when the supplemental circuits are factored in. For the record, I'm seeing about 35% average load reporting on both UPS over the last few days.
Any insight here would be greatly appreciated!
