Panel Board Calculation
- Thread starter bassil
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ron
Senior Member
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- New York, 40.7514,-73.9925
Re: Panel Board Calculation
Maybe the explanation is that it is a typo.
Maybe the explanation is that it is a typo.
Re: Panel Board Calculation
Maybe They Are Looking At Individual Single Phase Loads And Not The Complete System 22,465 Watts / 277 V = 81.10 Amps Plus 25% For Continuous Load 7.60 Amps Total Of 87.70 Amps Single Phase.
I Don't Know Why They Are Doing This Though.
-Ed
Maybe They Are Looking At Individual Single Phase Loads And Not The Complete System 22,465 Watts / 277 V = 81.10 Amps Plus 25% For Continuous Load 7.60 Amps Total Of 87.70 Amps Single Phase.
I Don't Know Why They Are Doing This Though.
-Ed
rick5280
Senior Member
Re: Panel Board Calculation
Actually, this is the formula for figuring out how many Wrong Silly Answers one would get while figuring out just what the heck the figures mean!
In other words, you will get 83 WSA (wrong silly answers) before you give up trying to do this calculation.
On a serious note, is there any information ahead of the formula? It looks to me like the 22465 might be watts, 277 might be volts (22465/277 = 81.10amps?), but the 25% is throwing me. 25% of 7.6 is 1.90, and would make that part of the calc correct ( 81.10 + 1.90 = 83), but where did the 7.6 come from, and what the heck is WSA????
Rick Miell
Actually, this is the formula for figuring out how many Wrong Silly Answers one would get while figuring out just what the heck the figures mean!
In other words, you will get 83 WSA (wrong silly answers) before you give up trying to do this calculation.
On a serious note, is there any information ahead of the formula? It looks to me like the 22465 might be watts, 277 might be volts (22465/277 = 81.10amps?), but the 25% is throwing me. 25% of 7.6 is 1.90, and would make that part of the calc correct ( 81.10 + 1.90 = 83), but where did the 7.6 come from, and what the heck is WSA????
Rick Miell
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- Lockport, IL
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- Semi-Retired Electrical Engineer
Re: Panel Board Calculation
Please note that the division of 22465 by 277 represents a single phase of the three phase system. If you are interested in, for example, checking on the size of the conductors to this panel, then a factor of the square root of three has to come into the equation at least two times.
Do you mean that you found this information written (perhaps by hand) on the face of a panelboard? If not, then where did it come from? Wherever it came from, it is nonsense.
Please note that the division of 22465 by 277 represents a single phase of the three phase system. If you are interested in, for example, checking on the size of the conductors to this panel, then a factor of the square root of three has to come into the equation at least two times.
lady sparks lover
Senior Member
Re: Panel Board Calculation
that's a strange one.
I would guess that:
22465/277 = 81.10 + 25%(7.6) = 83.0 WSA
22465 equals the watts or VA
277 equals the voltage
81.10 equals amps of all the other loads
7.6 is the maybe the amps of largest motor on the panel
25% is the 125% of the largest motor.
the sum of all the loads will give you the load of the panel.
Am I right??
that's a strange one.
I would guess that:
22465/277 = 81.10 + 25%(7.6) = 83.0 WSA
22465 equals the watts or VA
277 equals the voltage
81.10 equals amps of all the other loads
7.6 is the maybe the amps of largest motor on the panel
25% is the 125% of the largest motor.
the sum of all the loads will give you the load of the panel.
Am I right??
bonding jumper
Senior Member
Re: Panel Board Calculation
Yeah I remember this one from college, isn't this Kirchoff's second law, but I think he used the wrong value for G=9.81 not 7.6 and his units are incorrect it shouldn't be WSA, it should be Footpound furlongs.
Yeah I remember this one from college, isn't this Kirchoff's second law, but I think he used the wrong value for G=9.81 not 7.6 and his units are incorrect it shouldn't be WSA, it should be Footpound furlongs.
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