Got this question from my code class and having trouble finding a code rule.

What minimum voltage would be permitted at a load if at the point of connection to the supply authorities supply the voltage is 244?

If someone can help point me to the right section of the code that would be great.

NEC 2020 Art. 210-19-A

 

Got this question from my code class and having trouble finding a code rule.

What minimum voltage would be permitted at a load if at the point of connection to the supply authorities supply the voltage is 244?

If someone can help point me to the right section of the code that would be great.

Give you a hint. Look for a section that is on circuit loading.

 

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I posted the rule ... I'll go with Eddy's route

 

Ok I believe the answer is 231.8 based off 8-102 (1)(b) as it talks about the supply side being 5% voltage drop.

Thank you for the help!

 

NEC 2020 Art. 210-19-A

my bad ...
i didnt see CEC

 

and 5% total is what the NEC says
3% for each branch circuit

 

CEC is the same

 

Got this question from my code class and having trouble finding a code rule.

What minimum voltage would be permitted at a load if at the point of connection to the supply authorities supply the voltage is 244?

If someone can help point me to the right section of the code that would be great.

That would be 240 volt. You could have 3 to 5 volt either way. I forget which code would apply.

 

The 5% is based on the poco bringing 240 at rated service. If it is +240 at service the branches could tolerate more loss.

 

Regardless of what the voltage is at the service, our code says no more than %5 from the service to equipment and no more than 3% on any branch.

 

While that is true its based on the fact the poco is sposed to deliver 240 at the service making the outlet usable with all the allowances. In the real world it works better than the minimum due to the fact the service is hotter than that. I am not sure when those allowances were written?
FWIW,,, if we look at some old welders, the wire size is the same at 208 "some" , 220 back when it was and now at 240. The settings on them are hot, my buzzer is 92 on 85 and 118 on 105. My friend moved up here and said, wow my welder is hot. Everything has been upgraded to some extent, rare to see an old tranny here. Mine is 245 coming in,
There is always huge speculation about V drop. We were investigating an issue and my bud Mike works for the poco stopped by a job I owned and pulled on the weatherhead,,, 130A on old wire for 100 service and wend from 242 to 241, this was a quite a stretch and tranny down the block with half a dozen houses on it and a couple after. By the charts, the distance calc would have thought several V drop but NOT, I was really impressed.
I recall the wording best I can, the basic idea in the poco mandate says they got to deliver it at this making it usable with acceptable losses as per NEC at the recept for intended purpose.
Welding machines are a good example simply due to the fact they list max conductor length and min size.

 

Some local utility feeders are somewhat overloaded. So in high demand seasons, (heat for some, A/C for others) the taps on the transformer are often set to accommodate peak load. This will leave the voltage somewhat high in the off peak season.

Before they did the 5kV to 25kV distribution upgrade here several years back, some feeder transformers had to be tapped twice a year, spring and fall, to keep the voltage within tolerance.

A few volts high this time of year would not surprise me at all.

 

I might be overthinking this one,
What minimum voltage would be permitted at a load if at the point of connection to the supply authorities supply the voltage is 244?

The minimum voltage permitted at a load would just be the 5% of the service entrance / point of connection.

The minimum voltage permitted at the point of connection is dictated by CSA C235 or another specific utility code, so without any specifics 244 would fit in the 240V range (220-250V of normal operating, and 212-254V of extreme operating range).

so 212 * 0.95 = 201V would be the minimum voltage permitted, given the one time point of connection of 244V would be 231 at the load.

I would say 201, but i'm probably incorrect with what the intent of the question is.