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  1. richanton

    Arc Flash Question

    Thanks. I wasn't sure if I had entered incorrect data somehow.
  2. richanton

    Arc Flash Question

    I'm doing an arc Flash evaluation of my bldg distribution system, and I'm trying to understand why the calories vary so much under certain circumstances. My example is I have 2 identical 480V power circuit breakers with 600 amp trips, one breaker feeds a 400kva 480-208/120 transformer, the...
  3. richanton

    Research Lab Power Distribution

    Actually, Starline is the only manufacturer that makes anything similar in a 100 amp size. No one else does that I can find online. The problem with Starline is the attachment is similar to track lighting where you insert and twist to lock-in. I'm not that comfortable with that arrangement, so...
  4. richanton

    Research Lab Power Distribution

    I work in a large research lab with many individual lab spaces. For the last 50 years, we have used GE DH bus duct rated at 3 phase, 208 volt, 100 amps. That product is no longer available and parts are getting harder to find, so I was wondering what others might be doing for bringing similar...
  5. richanton

    EPO Circuitry

    We have been using an EPO circuit for 25 years for laboratory rooms, invented by someone back in the day. It's not good but it works, usually. Sometimes it doesn't. I attached a diagram of the circuit. Basically, diodes are used to allow for indicating lights when power is ON or when the...
  6. richanton

    LED Fixture for Outdoor parking Areas

    I'm looking at this one right now, which is supposedly all purpose, and the only one of its kind on the market in that it works with or without ballast,any electronic or magnetic(some) but I just tested it with 30 year old T12 magnetic ballast and it did not work. http://msissl.com/#!/t8
  7. richanton

    LED Fixture for Outdoor parking Areas

    I am looking at replacing the 250 watt metal halide lighting in my parking lot. It appears that the new style of fixture(Cree ARE-EDR-5M-R5) that consists of an array of LED's is not intended to have a field replaceable bulb. Cost of new fixture is about $1200. Retrofit bulbs are now available...
  8. richanton

    GE AK Power Breakers Microversatrip Arc Flash Question

    It's a GE Microversatrip TA9VT205GA3. I think I'll try to get to a GE technical support person. If I find out anything, I'll post it here.
  9. richanton

    GE AK Power Breakers Microversatrip Arc Flash Question

    That's why I'm asking whether it can be done energized. I only want to reduce the arc flash hazard for the 2 or 3 hours it takes to do the work. Then the settings would be returned to where they were.
  10. richanton

    GE AK Power Breakers Microversatrip Arc Flash Question

    I have switchgear with GE AK breakers. In doing calculations(SKM Software), I have determined that if I reduce the instantaneous setting to 1.5 I can limit the arc flash exposure. My question is if I can turn the dial while the breaker is energized.
  11. richanton

    Use of NEC Tap Rule

    After re-reading the code section several times, and finding some Mike Holt comments on the subject, it looks like you are correct. I do need that protective device before I go to any receptacle. Thanks for the input.
  12. richanton

    Use of NEC Tap Rule

    I have a situation where I have an existing 100 amp 3 phase service out of a panelboard. I would like to split the service in a junction box by terminating on a power distribution block and then feeding 3 individual 2 pole 30 amp receptacles mounted in the side of the jbox. There are #1AWG...
  13. richanton

    Parking Area Lighting - Replacements for Metal halide Bulb

    Some further info. This is the bulb I am looking at. http://www.ledglobalsupply.com/led-commercial-bulbs/250-watt-hid-led-retrofit/ I'm thinking this lamp requires airflow around it and may not be suitable with a sealed parking area fixture.
  14. richanton

    Parking Area Lighting - Replacements for Metal halide Bulb

    I have some existing parking lot 250 watt and 400 watt metal Halide fixtures. They are Lithonia Polestars. The latest searches I do seem to indicate that there are LED equivalent bulbs, but they are expensive $200- $300. Has anyone tried to do this and had any issues with overheating. The...
  15. richanton

    Use of temporary/Portable Equipment in Class 1 Division 2 area

    I have an area that is classified Class 1 - Div 2. It is for hazardous material storage, and the classification is only should leakage of vapors occur. If I need to run an analyzer and print a report to a printer via plugging standard 6' 120VAC cords into haz location receptacles, am I...
  16. richanton

    Helipad Lighting

    Thanks for the info. The attenuation info is interesting. Some of the prior troubleshooting involved getting a better antenna and repositioning it.
  17. richanton

    Helipad Lighting

    We just built a helipad and installed Flight Light HL-392 LED perimeter lights. We have been having a lot of intermittent trouble with the lights, either the remote signal not working from the approaching helicopter, or the lights coming on when they are not supposed to. Has anyone had any...
  18. richanton

    Medium Voltage Cable Insulation/Jacket Tracking

    We haven't tested anything yet. We are trying to determine if testing is where we should go next. I think the idea that the discoloring could be due to rainwater may be feasible. I'll post here later with results if we do decide to test the cable.
  19. richanton

    Medium Voltage Cable Insulation/Jacket Tracking

    Ok, I think I have this now. Link to photo should be below.http://files.engineering.com/getfile.aspx?folder=c9275f00-e528-46f0-9dac-93f1dc2b0135&file=high_voltage_IWTP.jpg
  20. richanton

    Medium Voltage Cable Insulation/Jacket Tracking

    I uploaded the .jpg photo to engineering .com as suggested, but I don't know how anyone can access it.

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