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· Coffee drinking member
I pretwist and then use wire nuts. Solder pots rule.
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14,897 Posts
Otis221 said:
Is there a rule of thumb to determine amperage of an HVAC Roof Top Unit (RTU) when voltage, phase and tonage is known?
Without a type & model number you can't estimate amperage.
The best you could do is be on the same block as the unit but not close enough to be in the ball park.
 

· Old Grumpy Bastard
GOV/MIL contracting
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62,061 Posts
Stand facing the prints, take all the 'rule of thumb' formulas you've been given and toss that crap out and request more info.
 

· Registered
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927 Posts
Stand facing the prints, take all the 'rule of thumb' formulas you've been given and toss that crap out and request more info.
When you get a written design narrative it usually gives you a list of RTU's..
It might say...provide power to 6-15 ton, 3-12 ton, 3-7 1/2 ton RTU's at 480V, 3ph.....

That's it...I thinks that's the kind of info the OP has received..
 
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