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  1. Replies
    2$$
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    150

    I would not be using the taps to over come a...

    I would not be using the taps to over come a voltage drop as when the load changes so will the voltage at the other end, and this could lead to over voltage equipment when the load is light, you only...
  2. Thread: Shock Hazard.

    by hurk27
    Replies
    9$$
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    128

    We must keep in mind that the water pipe and the...

    We must keep in mind that the water pipe and the service neutral are two parallel resistors, there may be other parallel paths such as the cable and phone lines that also parallel the neutral but the...
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    25$$
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    416

    First you haven't stated if these are all service...

    First you haven't stated if these are all service panels like on a multi-occupancy apartment building or a strip mall? or are we talking about running through sub panels and the raceway back to the...
  4. Replies
    45$$
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    1,035

    And the link you posted writen by Mark Ode...

    And the link you posted writen by Mark Ode clearly accepts that the mechanical connections of most faucets and other plumbing fittings does in fact make an acceptable connection (bond) between the...
  5. Replies
    20$$
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    496

    48kw single phase is about 200 amps of supply, if...

    48kw single phase is about 200 amps of supply, if the panels are spread all over the house how do you plan to load shed 200 amps of load from a 400 amp calculated load, by the way is that calculated...
  6. Replies
    45$$
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    1,035

    To add to the quote you posted, it states "Most...

    To add to the quote you posted, it states "Most electricians automatically bond the cold water line but do not ensure that the cold and the hot water lines are metallically interconnected through...
  7. Replies
    45$$
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    1,035

    Mike the article you are using backs our point of...

    Mike the article you are using backs our point of view:

    Mark who I have met many times at IEAI meetings starts out stating that a few years ago most faucets at sinks were connected by chromed,...
  8. Replies
    36$$
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    1,045

    I think it should be, but I think I remember...

    I think it should be, but I think I remember somewhere that a circuits rating is based upon the breaker protecting the circuit, in this case two 200 amp mains?

    Actually the 500KCMIL aluminum only...
  9. Replies
    36$$
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    1,045

    I just saw in the 2011 that exception #3 to...

    I just saw in the 2011 that exception #3 to 230.90(A) allows the combined ratting of the handles where two to 6 breakers are used as the disconnects to exceed the rating of the service conductors, it...
  10. Replies
    36$$
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    1,045

    D. Other: A violation of 230.90(A) You have...

    D. Other: A violation of 230.90(A)

    You have two 200 amp mains that exceed the rating of the aluminum 500KCMIL conductors which only have an ampacity of 310 amps, table 310.15(B)(6) (2008 and...
  11. Replies
    16$$
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    523

    I work at a Steel plant and we are not allowed to...

    I work at a Steel plant and we are not allowed to even get into a man lift or scissor lift without PFAS with an adjustable lanyard to the engineered connection point, if we are moving it then the...
  12. Replies
    19$$
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    672

    And the fact it being at 7' above grade is...

    And the fact it being at 7' above grade is subject to being damaged by what? an airplane crashing into the house??:eek:
  13. Replies
    60$$
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    1,439

    I think most of this comes from multi-wire...

    I think most of this comes from multi-wire circuits that someone opens to add another conductor to and don't expect to be hit so they are less cautious and make a better connection, also an...
  14. Thread: Testing by temp

    by hurk27
    Replies
    8$$
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    360

    Optical thermo scanners have many uses in the...

    Optical thermo scanners have many uses in the electrical industry, for one it is a safe way to test terminations for high resistance faults that are leading to a failure with out making contact with...
  15. Replies
    124$$
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    3,897

    I would like to point out that 250.4(A)(5) in a...

    I would like to point out that 250.4(A)(5) in a very indirect way even requires us to provide a safe low impedance fault current path that is capable of facilitating the operation of the over current...
  16. Replies
    124$$
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    3,897

    Is that not part of the fault path? I also...

    Is that not part of the fault path? I also pointed it out in post 25 when I made the statement that I was not even including the impedances ahead of the circuit that would lower the current even more...
  17. Replies
    124$$
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    3,897

    The problem with leaving the sizing of the EGC on...

    The problem with leaving the sizing of the EGC on a long run up to the lay person is that there are very few who would have the ability to even know how to calculate it down to the point of knowing...
  18. Replies
    124$$
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    3,897

    I saw it but didn't commit on it, if it did say...

    I saw it but didn't commit on it, if it did say capacity it would have removed any requirement to upsize the EGC, VD included, because the circuit would not have had the capacity for the load on the...
  19. Replies
    124$$
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    3,897

    What I can't figure is back in the 1999 it only...

    What I can't figure is back in the 1999 it only said for voltage drop:



    the 2002 changed to a more confusing:



    And removed any reference to voltage drop which would be the only reason you...
  20. Replies
    124$$
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    3,897

    In calculating your voltage drop going from a #8...

    In calculating your voltage drop going from a #8 to a #2awg for a 46 amp load I came out with about a 500' one way wire run this would give you a resistance path for fault current of .6055 ohms for...
  21. Replies
    124$$
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    3,897

    Look at it this way, in the intended installation...

    Look at it this way, in the intended installation the conductors would not have sufficient ampacity before the derating is done, the wording states: "from the minimum size that has sufficient...
  22. Replies
    124$$
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    3,897

    The only time I can see a requirement of upsizing...

    The only time I can see a requirement of upsizing the EGC is when dealing with voltage drop, the extra resistance of the wire can limit the current and cause the OCPD not to operate in the...
  23. Replies
    8$$
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    365

    I would be very careful in dealing with the...

    I would be very careful in dealing with the inspector on this, you might save on not installing a few GFCI's but could cause the owner to pay a much higher tax rate if you get your way, also the POCO...
  24. Ok I just misunderstood your post as I thought...

    Ok I just misunderstood your post as I thought you were thinking that it was more dangerous because of the EGC's, while its true because of everything being grounded we now have more return paths...
  25. Here is a case where the neutral was used for...

    Here is a case where the neutral was used for grounding that caused a elderly friend of mine to go into a coma for 4 months, she did regain conscience but was never the same and died a year later.
    ...
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