208V 1phase loads

[infinity]

Perhaps I am wrong but I agree with Bill

If 6 heaters are distributed evenly then that means each phase has 4- 1500 watt loads. 4 * 1500 = 6000 . 6000/120= 50 AMPS. Also 18000/360= 50

AB
BC
CA
AB
BC
CA

Must be early in the AM because this doesn't seem correct to me.:roll:

Let's say there's 3 heaters instead of six. That would be equivalent to one 208 volt, 3 phase load of 3 KW. Current would equal 3000/208/1.73=8.33 amps.

Now with six heaters connected you could double the current so you would end up 8.33 * 2 = 16.66 amps.

Where am I going wrong?

 

[Besoeker]

So what would the load be if all six heaters were distributed evenly across all three phases?

18kVA of course!

 

[Besoeker]

Must be early in the AM because this doesn't seem correct to me.:roll:

Let's say there's 3 heaters instead of six. That would be equivalent to one 208 volt, 3 phase load of 3 KW. Current would equal 3000/208/1.73=8.33 amps.

Now with six heaters connected you could double the current so you would end up 8.33 * 2 = 16.66 amps.

Where am I going wrong?

The bit in bold.
Note that the OP states that each heating load is 3 kVA.

 

[augie47]

Must be early in the AM because this doesn't seem correct to me.:roll:

Let's say there's 3 heaters instead of six. That would be equivalent to one 208 volt, 3 phase load of 3 KW. Current would equal 3000/208/1.73=8.33 amps.

Now with six heaters connected you could double the current so you would end up 8.33 * 2 = 16.66 amps.

Where am I going wrong?

3 at 3 kw ea = 9kw on 208 3 phase, 25 amps

 

[Dennis Alwon]

Must be early in the AM because this doesn't seem correct to me.:roll:

Let's say there's 3 heaters instead of six. That would be equivalent to one 208 volt, 3 phase load of 3 KW.
Where am I going wrong?

Remember they are single phase 208V heaters so this is incorrect.

 

[Little Bill]

Have any math to prove that?

3 x 6kva = 18kva
18kva/(1.732) x 208 =360.26
18kva/360.26=49.96 or 50A

 

[infinity]

Remember they are single phase 208V heaters so this is incorrect.

Yeah, I was for some reason thinking 120 volts. :roll:

 

[Little Bill]

3 x 6kva = 18kva
18kva/(1.732) x 208 =360.26
18kva/360.26=49.96 or 50A

Was my math correct?
:-?

 

[Dennis Alwon]

Was my math correct?
:-?

In a sense yes but I don't believe it would have worked if the phases weren't balanced.

 

[Little Bill]

In a sense yes but I don't believe it would have worked if the phases weren't balanced.

"So what would the load be if all six heaters were distributed evenly across all three phases? "

I was just doing the math on what he asked.

 

[Dennis Alwon]

"So what would the load be if all six heaters were distributed evenly across all three phases? "

I was just doing the math on what he asked.

I'm confused- your answer was based on even distribution- it is correct-- each phase would be 50 amps.

Look at post 20 and see if that helps. Obviously if we had most of the load on 2 phases or use the OP's initial setup, then using watts/360 would not work

 

[Besoeker]

In a sense yes but I don't believe it would have worked if the phases weren't balanced.

That would've been a different question.

 

[Dennis Alwon]

That would've been a different question.

That's correct but I wanted to be sure he saw that. I also used that formula in post 20.

 

[Little Bill]

That's correct but I wanted to be sure he saw that. I also used that formula in post 20.

I understand!

side note>>> Is there a way to quickly go back to a specific post #?

 

[Dennis Alwon]

side note>>> Is there a way to quickly go back to a specific post #?

If you use the forum settings then you are displaying 10 posts per page. so post 20 would be on page 2 at the bottom. Bottom or top right is where you select the pages.

 

[Little Bill]

If you use the forum settings then you are displaying 10 posts per page. so post 20 would be on page 2 at the bottom. Bottom or top right is where you select the pages.

I thought there might be a search function or something. I hadn't been on the forum long enough to learn the old style set up and now I'm still trying to figure this new style out.

 

[LarryFine]

Is there a way to quickly go back to a specific post #?

If you click on the little blue double arrow next to the quotee's name in a quote, it takes you to the original post.

Otherwise, you can click on the post number itself to single out that one post.

 

[Little Bill]

If you click on the little blue double arrow next to the quotee's name in a quote, it takes you to the original post.

Otherwise, you can click on the post number itself to single out that one post.

Thanks Larry! I knew all those little buttons that I haven't pushed had to do something.

I suppose you've been asked this before. But here goes...Wasn't "Larry Fine" one of the "3 Stooges?"

 

[Dennis Alwon]

Thanks Larry! I knew all those little buttons that I haven't pushed had to do something.

I suppose you've been asked this before. But here goes...Wasn't "Larry Fine" one of the "3 Stooges?"

Yep, but now he is our very own stooge.

 

[LarryFine]

Wasn't "Larry Fine" one of the "3 Stooges?"

Yep!

Yep, but now he is our very own stooge.

I resemble that remark!