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  1. Replies
    17$$
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    1,421

    I was a little to hasty on my last post. With a...

    I was a little to hasty on my last post. With a single point ground, there should be no difference in potential between the earth and equipment. No difference of potential, no current flow. The way I...
  2. Keep in mind you only need to install a lighting...

    Keep in mind you only need to install a lighting outlet and no luminaire is required, for a bedroom the light switch location is not specified and could be across the room...as pointed out if you...
  3. Fire caused by "bug collector" detected by smart smoke detector

    In this news article, a children's bug collector concentrated the suns rays, started a fire, the owner was alerted by his smart smoke detectors.
    ...
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    31$$
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    881

    Question: What is the maximum available fault...

    Question: What is the maximum available fault current? The non fused disconnects I have installed have a maximum fault current rating of 10,000 amps.
    Our POCO requires a disconnect ahead of the...
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    17$$
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    1,421

    Again, Motorola R56 is the standard for telecom...

    Again, Motorola R56 is the standard for telecom and cell towers. The cell companies use a single point ground....lightning wants to go to a earth ground, path to the equipment is high impedance.
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    6$$
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    400

    Good question. In a 120V system, there is no...

    Good question.
    In a 120V system, there is no neutral, but we all call the white wire a neutral (need three wires to have a neutral).
    In my control systems, the 120 was from a transformer, so it was...
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    6$$
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    324

    You can get a motor rated switch with overloads,...

    You can get a motor rated switch with overloads, thats the simplest solution. Is the OL in the NEMA 7 box something that was purchased or field assembled?
    If field assembled, how do you reset the...
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    1$$
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    167

    You have answered your own question. "There are...

    You have answered your own question.
    "There are multiple units fed from a single circuit so the breaker in the branch panel is larger than the unit nameplate for Maximum Overcurrent Protection since...
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    3$$
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    312

    I always recommended the Mike Holt Exam prep...

    I always recommended the Mike Holt Exam prep material (helps support this forum) and my students said it helped them pass. Many of the questions are the same as on the state exam...
    As far as calcs...
  10. How Hard? very hard, just due to the weight of...

    How Hard? very hard, just due to the weight of the conductors
    Suggest digging up the conduit, about every 500 ft, put in 90s and a handhole, IE a 18x24x 12 deep concrete handhole with lid, long...
  11. Thread: Cable guy

    by tom baker
    Replies
    22$$
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    1,392

    On the lighter side, I am pretty sure this...

    On the lighter side, I am pretty sure this picture is at Mike Holts house...he had all the best surge protection possible, but kept loosing equipment (Central Florida, lightning). Went out side and...
  12. Thread: Cable guy

    by tom baker
    Replies
    22$$
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    1,392

    In Washington our AHJ does not issue permits for...

    In Washington our AHJ does not issue permits for telecom and they don't inspect. I just had fiber optic installed with a optical network interface in the basement (Art 840 install), and no permit....
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    11$$
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    766

    Example of clean water, related to this post A...

    Example of clean water, related to this post
    A small vault, about 3 ft sq x 2 ft deep, with a 2 hp pump,a water booster pump, filled with rainwater as roots clogged the drain.
    The fuses blew. This...
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    18$$
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    926

    Yes and that reminds me of a question I used in...

    Yes and that reminds me of a question I used in my classes
    What size ground for a 200 Amp Service?
    While you make think you know its a #4....
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    18$$
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    926

    There is a difference between section 250.66 and...

    There is a difference between section 250.66 and table 250.66. The table sizes are larger than what is allowed in 250.66 for specific electrodes
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    1$$
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    279

    There is boiler plate language somewhere that...

    There is boiler plate language somewhere that basically says we can't help home owners. I will close your post
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    18$$
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    926

    For Grounding and Bonding "We have met the enemy...

    For Grounding and Bonding "We have met the enemy and he is us" Pogo - I used this in my grounding classes.
    The definition of ground is "the earth"
    Definitions are important, thats why they are in...
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    29$$
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    2,154

    So the question is why does the GEC connection...

    So the question is why does the GEC connection need to be accessible?
    I think I have the answer.
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    29$$
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    2,154

    It may be in the Electrical Currents. I just...

    It may be in the Electrical Currents. I just remember that being discussed. 250 068 says the termination point must be accessible, L&I does not consider it accessible in the meter socket - I would...
  20. Thread: Cable guy

    by tom baker
    Replies
    22$$
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    1,392

    Except the telecom utilities are not under the...

    Except the telecom utilities are not under the scope of the NEC. NEC does not apply until the customer side of the demark.
    Same as for service drops, NEC does not apply ahead of the service point....
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    17$$
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    1,421

    Not sure what you are referring to "equipment...

    Not sure what you are referring to
    "equipment bodies"
    "return path"
    The initial leader for lighting is from ground to cloud and then the big strike is cloud to earth
  22. Replies
    17$$
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    1,421

    Exactly correct on single point ground!

    Exactly correct on single point ground!
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    11$$
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    766

    I have seen pump pits filled with water and the...

    I have seen pump pits filled with water and the pump still running.
    Clean water is not a conductor, and a GFCI may not trip
    Consider a flood switch connected to a shut trip breaker
    Sump pumps and...
  24. Replies
    29$$
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    2,154

    In Washington our rules state the GEC can not...

    In Washington our rules state the GEC can not connect in the meter socket as its not accessible, but if the POCO requires a GEC then its allowed (IE at a remote meter)
    I would suggest the best...
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    16$$
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    1,009

    I used inlets under the IEC 309 standard, each is...

    I used inlets under the IEC 309 standard, each is unique to the voltage and phase, they are interchange able between manufacturers
    Like this...
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