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  1. Thread: CADWELD & PGE

    by MRKN
    Replies
    11$$
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    1,593

    I like it! Thanks for pointing that out.

    I like it! Thanks for pointing that out.
  2. Replies
    11$$
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    697

    Thanks, yes of course, I was tired when I used...

    Thanks, yes of course, I was tired when I used that example.

    Let me re-phrase my question.

    If the ETAP analysis shows the interrupting device as the main circuit breaker (which is properly...
  3. Thread: CADWELD & PGE

    by MRKN
    Replies
    11$$
    Views
    1,593

    Are there not also concerns about toxic...

    Are there not also concerns about toxic byproducts resulting from the process of exorthermic processes such as cadwelding?
  4. Replies
    11$$
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    697

    Jraef, can you enlighten me why the instantaneous...

    Jraef, can you enlighten me why the instantaneous of a main breaker can not have credit taken, say on a power CB in LV switchgear
  5. Typo - I meant lightning as you caught. Point...

    Typo - I meant lightning as you caught.

    Point taken from the video. It's a concern in occupied buildings, when lightning strikes create voltage gradients. Out in fields, or industrial plants, it's...
  6. Larry, Thank you for the clarification on...

    Larry,

    Thank you for the clarification on grounding vs. grounded. Hopefully I will remember this nuance for the rest of my days...

    And agreed that every transformer with galvanically isolated...
  7. Ok - so "grounded conductor" is equivalent to...

    Ok - so "grounded conductor" is equivalent to saying "neutral". I tried looking up "grounded conductor" in 100 - definitions - but it wasn't immediately clear to me. Both a neutral and an EGC are a...
  8. New motor has EGC run to it - any requirement for a new ground well at the motor?

    I cannot find any requirement in the NEC for a grounding electrode at every piece of electrical equipment such as at a motor.

    Yes, at every building or structure served per 250.32.

    But in...
  9. Your hope is not in vain.

    Your hope is not in vain.
  10. I believe the old IEEE 1584 stated you could...

    I believe the old IEEE 1584 stated you could exclude motors smaller than 37 kW / 50 HP; not sure if that's changed in 2018. I can tell you that exclusion was broadly implemented at the facility I...
  11. Replies
    11$$
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    3,461

    It is always a PSM interpretation to expand...

    It is always a PSM interpretation to expand electrical area classifications, the intent of which is explicitly limited to temporary and permanent electrical installations, to restricted access for...
  12. Replies
    51$$
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    2,650

    Alright thanks for the feedback. I think it makes...

    Alright thanks for the feedback. I think it makes sense to investigate that option then with some more detail and try and find any fatal flaws.
  13. Replies
    51$$
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    2,650

    This is not a point of interconnect - it's all...

    This is not a point of interconnect - it's all owned and operated by the same entity. My thought with staying low voltage is that it keeps things simple, the only other available voltage is 12 kV,...
  14. Replies
    51$$
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    2,650

    Mitigating voltage drop on a 2,000' 480 V feeder

    Looking at installing a panelboard to serve ~150 kW of load, but the only available and convenient voltage source nearby is 480... unfortunately it's about a 2,000' conduit run. The load is pretty...
  15. Replies
    8$$
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    2,386

    There's not enough information to give an answer...

    There's not enough information to give an answer here. I note however that Exception 4 deals with segments
  16. Luckily I have had a good relationship with PG&E...

    Luckily I have had a good relationship with PG&E engineers, they actually shared their Aspen model, when we were coordinating our 115 kV transmission line upgrade (we own one end, they the other).
    ...
  17. Replies
    7$$
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    1,553

    You are correct. My intent was to compare...

    You are correct. My intent was to compare division as opposed to zone classification methods.
  18. Replies
    7$$
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    1,553

    I believe natural gas is a class 1 div 2 group D...

    I believe natural gas is a class 1 div 2 group D area, assuming you are using the division method.

    Basic process is to identify all of the potential leak sources, this will include anything with...
  19. Replies
    3$$
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    616

    If the structure is electrically served, then it...

    If the structure is electrically served, then it is required to be grounded.

    If there is 20 linear feet or more of interconnected rebar, an astute inspector will require it to be connected to the...
  20. If a higher X/R ratio only affects the DC offset,...

    If a higher X/R ratio only affects the DC offset, then we know di/dt at the zero-crossing does not have an affect. I believe the reason you need to de-rate the breaker interrupting capacity depending...
  21. Replies
    9$$
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    825

    Yes, this is good practice, especially for the...

    Yes, this is good practice, especially for the above-ground portion, since this is where it's exposed to mechanical damage, and you may only have one GEC. Requiring 2 GEC and/or very large GEC are...
  22. Replies
    3$$
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    1,038

    I believe this type of short term activity can be...

    I believe this type of short term activity can be allowed with sniffing the area as a pre-requisite for the hot-work permit. Of course it is a spot check only, ask them to do it at least twice a...
  23. Replies
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    1,592

    I'm sure he meant footing or foundation, we're...

    I'm sure he meant footing or foundation, we're not all well-versed in civil/structural nomenclature here.
  24. Replies
    13$$
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    2,101

    As long as you don't have a centrifugal switch...

    As long as you don't have a centrifugal switch that can arc, internal overloads that can arc, or motor space heater leads that exceed 80% of the lowest AIT, common sense tells me that the motor would...
  25. Replies
    13$$
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    2,101

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