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Type: Posts; User: templdl

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1. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### This is the problem. 'Yes' is a correct answer...

This is the problem. 'Yes' is a correct answer but now you have provided the OP with a loaded gun. So the OP goes ahead and fries the transformer by overloading that angle phase and then says he/she...
2. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### I guess I thought that it should be obvious as I...

I guess I thought that it should be obvious as I didn't think that it was that complicated. From each of L1,L2, and L3 to the X0(N) is single phase from L1-L2, L2-L3,and L1-L3 it is also single...
3. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### OK. When combined with (2) windings in series at...

OK. When combined with (2) windings in series at higher voltage I can see that. Thus, it is a bit ambiguous to simply ask a question about a 3ph transformer supplying a single 1ph load.
4. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### Then if the the 1ph load is connected to L1-N and...

Then if the the 1ph load is connected to L1-N and that is the only 1ph load then you could exceed the 1/3 the kva rating. As such is the L1 to X0 winding rated for that?
5. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### Not, just making s statement. That a 3ph...

Not, just making s statement. That a 3ph transformer when supplied my all three phases, when only a single 1ph load is bring a supplied that the load is limited to 1/3 of the kva rating of the...
6. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### No argument regarding supplying 1ph from any (2)...

No argument regarding supplying 1ph from any (2) 2 L-L or a L-N of a 3ph3w delta, 3ph4w delta, or 3ph4w wye transformer source which is common place. Understanding that any of these transformers is...
7. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### So, since the other 2phases are 120deg appart you...

So, since the other 2phases are 120deg appart you are essentially changing 3ph to supply the single phase then?
8. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### http://www.mgmtransformer.com/faqs/can-a-three-pha...

Can a three phase transformer be loaded as a single phase transformer?
Yes, but the load...
9. ## Thread: 3 phase Transformer

by templdl
Replies
32\$\$
Views
1,180

### Yes, for example a 3ph 30kva transformer when...

Yes, for example a 3ph 30kva transformer when used to supply a single phase load by using only 2 of the transformer's secondary lines will only provide 1/3 of the transformer"s rated kvan or 10kva.
10. ## Thread: Kitchen Island, How Many Recptacles Required

by templdl
Replies
20\$\$
Views
729

### If it is a bid job then to assure that you are...

If it is a bid job then to assure that you are quoting apples to apples meeting minimum code requirements makes sense. If it is time and materials where adding an extra outlet or two won't break the...
11. ## Thread: Modifying 480V Switchgear Bus

by templdl
Replies
17\$\$
Views
527

### The gear must have a bus duct throat (BDT). If it...

The gear must have a bus duct throat (BDT). If it comes out of the end of the gear remove it and add an air terminal chamber (ATC) extending the bus with suitable pads with NEMA hole drilling...
12. ## Thread: Modifying 480V Switchgear Bus

by templdl
Replies
17\$\$
Views
527

### The existing gear must have a bus duct throat. If...

The existing gear must have a bus duct throat. If it is out the end remove the throat and by adding a NEMA3R air terminal chamber (ATC) of suitable size, assuming this is outdoor gear, putting bus...
13. ## Thread: Modifying 480V Switchgear Bus

by templdl
Replies
17\$\$
Views
527

### The way that I would approach this is to...

The way that I would approach this is to evaluated the response from the swgr mfr. Sometime the response is correct and one runs into the there is the risk of getting an answer that you don't want to...
14. ## Thread: 110.14 Fine Stranded Connectors

by templdl
Replies
7\$\$
Views
361

### It would to know how the manufacturer stands...

It would to know how the manufacturer stands behind that. I would highly doubt if they varified connection method with those that UL486 requires to include a pull and temperature rise tests. This is...
15. ## Thread: MOLDED CASE BREAKER KEEPS TRIPPING AFTER 8 HOURS

by templdl
Replies
30\$\$
Views
1,627

### Interesting, more PFCC issues, And of course the...

Interesting, more PFCC issues,
And of course the POCO stepped up to the plate and took the hit, ya right. The only time that I had a POCO asume some of the cost for a loss was when they failed to...
16. ## Thread: MOLDED CASE BREAKER KEEPS TRIPPING AFTER 8 HOURS

by templdl
Replies
30\$\$
Views
1,627

### Exercising the breaker most likely will reduce...

Exercising the breaker most likely will reduce the contact resistance a Nd decrease the heating. Remember that the moving contacts actually rub slightly against the stationary contacts when there are...
17. ## Thread: Main breaker replacement

by templdl
Replies
9\$\$
Views
397

### I agree. Unless you need the kaic.and can series...

I agree. Unless you need the kaic.and can series rate the panel as such (unlikely) doen't waist the extra money.
18. ## Thread: MOLDED CASE BREAKER KEEPS TRIPPING AFTER 8 HOURS

by templdl
Replies
30\$\$
Views
1,627

### Go figure. Yours was a bit more difficult to...

Go figure. Yours was a bit more difficult to resolve than my problem as got me it was a calculated guess and how the electronic trp breaker was responding to it.. Simply changed the breaker to a...
19. ## Thread: MOLDED CASE BREAKER KEEPS TRIPPING AFTER 8 HOURS

by templdl
Replies
30\$\$
Views
1,627

### Yes, how is going to stand around waiting for...

Yes, how is going to stand around waiting for hours for a trip unless you were working in the area or someone else was who could be a reliable observer that would follow your directives in the proper...
20. ## Thread: MOLDED CASE BREAKER KEEPS TRIPPING AFTER 8 HOURS

by templdl
Replies
30\$\$
Views
1,627

### I agree. My post was too darned long and I...

I agree. My post was too darned long and I omitted the short circuit/magnetic/instantaneous aspect because of the time frame given which is usually a thermal trip. Something is causing the...

by templdl
Replies
11\$\$
Views
641

Oh Oh.
22. ## Thread: MOLDED CASE BREAKER KEEPS TRIPPING AFTER 8 HOURS

by templdl
Replies
30\$\$
Views
1,627

### Have you talken a thermal image of the breaker?...

Have you talken a thermal image of the breaker? Loose load connection generate heat, this connection being close to the thermal re elements of the breaker will cause the breaker to derate itself and...
23. ## Thread: AIC Rated

by templdl
Replies
11\$\$
Views
641

### What is the inspector's request based upon? From...

What is the inspector's request based upon? From what I can tell it's because he said so. Or, what he customarily has seen in similar facilitiesin the area. Not good enough.
Ask you POCO first. If...
24. ## Thread: Buck & Boost for 120V Outdoor Circuit

by templdl
Replies
20\$\$
Views
784

### Yes, yu ou could use a B-B to boost the voltage...

Yes, yu ou could use a B-B to boost the voltage but as one of the others I believe said when you apply the transformer is the boosted voltage based upon the circuit when loaded? If so the voltage may...
25. ## Thread: 3P vs. 4P Transfer Switches and Separately Derived Systems

by templdl
Replies
7\$\$
Views
499

### To my point. With little or no application...

To my point. With little or no application information there are a lot of implications.
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