# Search:

Type: Posts; User: Mike01

Page 1 of 8 1

1. ## Thread: TCC - Equipment Protectoin

by Mike01
Replies
6\$\$
Views
312

### LVPCB

Ron,
I will post the TCC when I have a chance the breaker is a LVPCB with 1600A frame and sensor, the LT setting has been adjusted to 0.5 [800A]. I understand the actual fault current [as...
2. ## Thread: TCC - Equipment Protectoin

by Mike01
Replies
6\$\$
Views
312

### TCC - Equipment Protectoin

In looking at a coordination study I noticed the following:
Main switchgear consist of 480V ANSI Sw. Gear. [single ended] with LVPCB's and electronic trip units

Feeder No.2 is a 800A feeder with...
3. ## Thread: MWBC & Voltage Drop

by Mike01
Replies
2\$\$
Views
187

### MWBC & Voltage Drop

Have a friendly discussion in the office on this one but trying to work out the math part of it. With a MWBC [typically for lighting] I see a lot of 277V fixtures connected to a 480Y/277V MWBC with...
4. ## Thread: MV Equipment Grounding Conductors

by Mike01
Replies
2\$\$
Views
383

### MV Equipment Grounding Conductors

Is an equipment ground in a MV 13.8kV sized any different than in LV systems, do you refer to 250.122? Looking thru. 250.180 it discusses grounded conductors and in 250.184(B)(8) indicates that it...
5. ## Thread: MWBC - Stray Voltage

by Mike01
Replies
6\$\$
Views
448

### MWBC - Stray Voltage

On a multi wire branch circuit [from a 208Y/120V panel fed from a 30kVA xfmr] with one breaker / phase turned off, there is still a reading of 24V, measured at the receptacle? Sounds to me like a...
6. ## Thread: Conductor Volume?

by Mike01
Replies
3\$\$
Views
197

### Conductor Volume?

When calculating box fill, where can I find or better yet how does one calculate the volume of a conductor larger than a #6 the maximum indicated in table 314.16[B], where it terminates to a device...
7. ## Thread: Minimum Space encosure to lug..

by Mike01
Replies
4\$\$
Views
269

### 312.6 Wire Bending??

312.6 refers to wire bending, however there are no bends in the cable it will enter the enclosure and then terminate on the lugs, it will not be entering and leaving the enclosure, or "bending"...
8. ## Thread: Minimum Space encosure to lug..

by Mike01
Replies
4\$\$
Views
269

### Minimum Space encosure to lug..

I was looking [I thought there was] for a table that indicates the minimum dimension form the termination lug to the enclosure wall based on the cable size and quantity per lug. For some reason I...
9. ## Thread: "Heavy Duty Lamp Holder"

by Mike01
Replies
2\$\$
Views
426

### "Heavy Duty Lamp Holder"

How would I find out if a fluorescent lamp socket complies with NEC Article 210.21[A] for heavy duty lamp holder?
10. ## Thread: Building Addition Grounding 250.50[2]

by Mike01
Replies
3\$\$
Views
356

### Building Addition Grounding 250.50[2]

In 250.50[2] Metal Frame of the Building or Structure for a grounding electrode system is every column of the building required to meet one of the three requirements? For example I am working on a...
11. ## Thread: Trip coordination

by Mike01
Replies
9\$\$
Views
477

### Overlap / Coordination

Looks like this is a Molded Case Circuit Breaker [UL489] with an adjustable electronic trip unit [310] [LSI], it appears the instantaneous on this unit cannot be disabled due to the fact it is a MCCB...
12. ## Thread: Buck Boost Xfmr OCPD?

by Mike01
Replies
1\$\$
Views
182

### Buck Boost Xfmr OCPD?

having a friendly debate with a co-worker about a A BB xfmr. OCPD from 208-240 with and wanted to get you thoughts / opinions at 2kva [16x32 voltage windings] with the max secondary amps at 62.5 and...
13. ## Thread: Cable Tray and Grounding

by Mike01
Replies
1\$\$
Views
298

### Cable Tray and Grounding

I was on a project site where 3-1/C cables were used in triplex in tray to serve equipment and only one-EGC was run for the parallel set of conductors, in looking at the code it appears that a ECG is...
14. ## Thread: Hazardous Locations / Classifications

by Mike01
Replies
5\$\$
Views
280

### Garage?

Bob, I agree I would like to use the ventilated requirements for minor garage however under minor garage it talks about gaseous fuels "will not be dispensed or transferred" that is where I am stuck...
15. ## Thread: Hazardous Locations / Classifications

by Mike01
Replies
5\$\$
Views
280

### 511.3[C]

Correct, the section [C] that refers to Major Repair Garages indicates that "flammable liquids will not be dispensed, but repair activities that involve the transfer of such fluids", since I have no...
16. ## Thread: Hazardous Locations / Classifications

by Mike01
Replies
5\$\$
Views
280

### Hazardous Locations / Classifications

Looking at a project where there will be vehicle testing, and includes pit areas, typically the vehicle is driven into the facility tested and removed however there are cases where they bring in fuel...
17. ## Thread: Xfmr. Secondary Conductors

by Mike01
Replies
1\$\$
Views
217

### Xfmr. Secondary Conductors

I was looking at an exisitng one-line diagram and noticed sometihing [unrelated to the project at hand but got me thinking], there is an automatic transfer swtich connected to a set of transfomrer...
18. ## Thread: Two Speed to VFD?

by Mike01
Replies
2\$\$
Views
353

### Two Speed to VFD?

Can a standard 2-speed / 1-winding motor operate on a single VFD? The thought was to abandon the low speed connect the VFD to the high speed only and set the max. min to a level where the motor will...
19. ## Thread: Receptacle installation

by Mike01
Replies
4\$\$
Views
382

### Thanks.

Wow, I missed that one learned something new today. Thanks everyone.
20. ## Thread: Receptacle installation

by Mike01
Replies
4\$\$
Views
382

### Receptacle installation

While on a project site the electrician installed backboxes with extension rings however with the additional wall covering the receptacle when installed flush is not completely recessed into the...
21. ## Thread: Generator OCPD Size

by Mike01
Replies
1\$\$
Views
250

### Generator OCPD Size

in reviewing two proposals for new generators [500kVA/400kW] one manufacturer is providing a 600A breaker the other an 800A breaker at 500kVA @ 480V approx. 600A each are indicated as standard 80%...
22. ## Thread: Flexible Cords above Ceilings?

by Mike01
Replies
3\$\$
Views
420

### Flexible Cords above Ceilings?

Article 400 "Cords" indicates flexible cords cannot be installed above suspended ceilings [with exceptions], however does this inlcude low voltage cabling from a power supply? for example where I...
23. ## Thread: buck / boost & single phase neutral

by Mike01
Replies
6\$\$
Views
476

### Equipment Specs.

Gar,
The equipment in question is a piece of kitchen euipment [coffee] The manufacturers literature indicates a 220V circuit, the engineer designed in a buck / boost xfmr. to achieve the 220V, [not...
24. ## Thread: buck / boost & single phase neutral

by Mike01
Replies
6\$\$
Views
476

### buck / boost & single phase neutral

On a buck/boost xfmr installation, the drawings indicate a single phase buck transformer [208-220] however the load requries a neutral also to control some small valves, sensors, can a buck boost...
25. ## Thread: Flush CounterTop Receptacle

by Mike01
Replies
10\$\$
Views
938

### 406.4[E]

Found it, actually under Article 406 Receptalces; 406.4[E], but this only refers to dwelling units it does not mention commerical installation?
Results 1 to 25 of 200
Page 1 of 8 1