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Type: Posts; User: infinity

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1. ## Thread: Maximum size of System Bonding Jumper in Transformer Derived System

by infinity
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9\$\$
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417

### No, although the table 250.102(C) is relatively...

No, although the table 250.102(C) is relatively new the old section 250.28(D) had the same requirements for 12.5% in the 2005 NEC. #3/0 is still the largest required GEC.
2. ## Thread: 240V to 208V Water Heater

by infinity
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15\$\$
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539

### No your formula is incorrect. You need to find...

No your formula is incorrect. You need to find the resistance of the heater at 240 volts and then use that with 208 volts in your calculation. Lower voltage equals lower current with a resisitive...
3. ## Thread: 240V to 208V Water Heater

by infinity
Replies
15\$\$
Views
539

### The current at 240 volts is 9000/240=37.5 amps. ...

The current at 240 volts is 9000/240=37.5 amps. At 208 volts it will be considerably less current.

by infinity
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11\$\$
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### A Larry stated spot welding to the bus is a...

A Larry stated spot welding to the bus is a common practice for these split bus panels and was done by the manufacturer.

by infinity
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399

### That would be fine for using the mast to support...

That would be fine for using the mast to support the drop.
6. ## Thread: Petroleum emergency stop disconnect

by infinity
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### Duplicate respond here:...

Duplicate respond here:
7. ## Thread: 310.15(B)(3)(a) Meaning of "maintaining spacing"

by infinity
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### Cables through a series of holes are static and...

Cables through a series of holes are static and not going to move. If there is a space between them I don't see how that's not maintaining spacing. If a physical spacing device is required then the...
8. ## Thread: Utility disconnect not service disconnect

by infinity
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31\$\$
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882

### I agree, for the MBJ and GEC connections just...

I agree, for the MBJ and GEC connections just pretend the meter disconnect does not exist and wire as you would any other service.

by infinity
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6\$\$
Views
399

### IMO it's a judgement call depending on how the...

IMO it's a judgement call depending on how the section above the coupling is supported. You could always add a guy wire to increase the mechanical strength of the mast.
10. ## Thread: Maximum size of System Bonding Jumper in Transformer Derived System

by infinity
Replies
9\$\$
Views
417

### Yes so in this case (unless there is some...

Yes so in this case (unless there is some adjustment factor) you end up with a 5700 amp set of secondary conductors.
11. ## Thread: Maximum size of System Bonding Jumper in Transformer Derived System

by infinity
Replies
9\$\$
Views
417

### 12 sets of 4 conductors in each set. A,B,C,N

12 sets of 4 conductors in each set. A,B,C,N

by infinity
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### Here's the 2014 and 2017 for comparison. 2014...

Here's the 2014 and 2017 for comparison.

2014 NEC:

2017 NEC:

by infinity
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Yes. :)
14. ## Thread: ATS Size Change

by infinity
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403

### Makes no sense to me. :?

Makes no sense to me. :?
15. ## Thread: Track Lighting in Clothes Closet

by infinity
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### So it's not specifically prohibited and is a...

So it's not specifically prohibited and is a judgement call as to whether or not is will likely be subject to damage.

by infinity
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7\$\$
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### Sounds like two circuits to me: 2017 NEC:

Sounds like two circuits to me:

2017 NEC:
17. ## Thread: Track Lighting in Clothes Closet

by infinity
Replies
7\$\$
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342

### I don't see track lighting specifically listed as...

I don't see track lighting specifically listed as not permitted. If the lamp is fully enclosed should the light source type even matter?
18. ## Thread: Track Lighting in Clothes Closet

by infinity
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7\$\$
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### I tend to agree but what specific wording in the...

I tend to agree but what specific wording in the NEC would say that?
19. ## Thread: Maximum size of System Bonding Jumper in Transformer Derived System

by infinity
Replies
9\$\$
Views
417

### There is no maximum size but there is a minimum. ...

There is no maximum size but there is a minimum. You would take size of the ungrounded conductor times the number of sets and then multiply by 12.5%.

12*750 kcmil=9000 kcmil*12.5%=1125 kcmil
20. ## Thread: Isolated phase parallel runs.

by infinity
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3\$\$
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192

### Why do would you want to do this iso-phase? Also...

Why do would you want to do this iso-phase? Also a 90° C conductor van use it's 90° C ampacity for the derating calculation.
21. ## Thread: MCB TO MLO

by infinity
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16\$\$
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918

If I'm reading your drawing correctly there is no reason to remove the existing main CB but if that is what they want and they're paying you for it then just do it. :)
22. ## Thread: 3-way and 4-way switching location requirements

by infinity
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### As stated below 3-ways is one way to comply with...

As stated below 3-ways is one way to comply with that section but it is not a requirement.

I agree. :)
23. ## Thread: Track Lighting in Clothes Closet

by infinity
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7\$\$
Views
342

### Track Lighting in Clothes Closet

If the proper clearances are met is lighting track installed above the closet door with enclosed LED heads permitted in a clothes closet?
24. ## Thread: Tap Rule Question

by infinity
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### If everything is ahead of the service disconnects...

If everything is ahead of the service disconnects the feeder tap rules of Article 240 do not apply since you have service entrance conductors (SEC's) not a feeder. I might be slightly confused by...
25. ## Thread: Luminary cable without the MC

by infinity
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16\$\$
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745

### Who are you responding to?

Who are you responding to?
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