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Type: Posts; User: drcampbell

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  1. Visualize putting four 3000-foot rolls of #8 wire...

    Visualize putting four 3000-foot rolls of #8 wire (~600 pounds) on a pallet and dragging it across the floor.
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    Dielectric-rated boots exist. I've seen...

    Dielectric-rated boots exist. I've seen firefighters' suppliers offering them.

    It's probably best to not repeat "rubber boots could help" in public. Maybe they could, and maybe rubber gloves...
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    If my meter is to be believed -- and I'm not so...

    If my meter is to be believed -- and I'm not so sure I believe it -- there was 1.5 MΩ in parallel with 10,000 μFarads between white & ground.
    (The main breaker was off when I measured that; nothing...
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    406.4(D)(2)(c)

    406.4(D)(2)(c) requires receptacles to be labeled "No Equipment Ground" and "GFCI Protected".
    Where can I get some durable labels (engraved cover plates?) which say that?
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    As well they should be. That stuff is a potent...

    As well they should be. That stuff is a potent reactive chemical compound, and it's almost everywhere.

    Outside of the refrigeration & air-conditioning biz, Refrigerant-718 is known as DHMO, and...
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    So many people, so many wrong opinions ......

    So many people, so many wrong opinions ...
    Clearly, this "someone" has never taken a receptacle apart and examined its inner workings. If you can't avoid this person for life, encourage him to do...
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    So ... finally made it back to the site. I'm...

    So ... finally made it back to the site.
    I'm revising my estimate of the age of this house -- now 1946-1959 -- after noticing 2-wire cloth-jacketed NM cable and black-enameled junction/device boxes....
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    About 30 miles from Philadelphia. Were their...

    About 30 miles from Philadelphia. Were their manufacturing facilities there, too?
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    I didn't know 2P4W was still in use. I would...

    I didn't know 2P4W was still in use. I would enjoy knowing more. For example, how is the incoming service configured? 2 x 120/240 volts? What voltage(s) are supplied to large industrial...
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    It might also involve hazard classification due...

    It might also involve hazard classification due to the presence of jet fuel and/or aviation gasoline.
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    Somebody with more motor-theory expertise than me...

    Somebody with more motor-theory expertise than me ...
    Say a compressor motor needs a 20-µF run capacitor and you install two 10s. What if one of the two fails? Assuming that it keeps turning,...
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    I have been reading all your comments and giving...

    I have been reading all your comments and giving them serious thought, but:
    [1] I haven't been back to the site during those four days.
    [2] I was reluctant to pull anything and expose any...
  13. It also assumes the same efficiency, and the same...

    It also assumes the same efficiency, and the same I2R losses in both the stator and the rotor.
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    I don't "miss" Refrigerant-717 because it's still...

    I don't "miss" Refrigerant-717 because it's still around. It doesn't deplete ozone or contribute to global warming, and hasn't been regulated or legislated away.

    But whatever its excellent...
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    I miss Refrigerant-20. (chloroform) And...

    I miss Refrigerant-20. (chloroform)

    And Refrigerant-10 (carbon tetrachloride), which forms phosgene gas when overheated.

    And Refrigerant-30 (methylene chloride), which is also a powerful...
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    Small 1½-story bungalow, single-family detached....

    Small 1½-story bungalow, single-family detached.
    Currently vacant, being prepped for sale. Absolutely nothing is plugged into any receptacle except the dishwasher & disposal. A few ceiling lights...
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    HOT/NEU Reversal?

    Help me interpret this:

    3.0 volts green-to-white
    119.2 volts green-to-black
    120.9 volts white-to-black
    Sperry 5-light tester shows "HOT/NEU REV".

    House was probably built in the 1960s (?). ...
  18. Who cares? The circuit supplying it needs to be...

    Who cares? The circuit supplying it needs to be designed & installed based on full-load current.
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    Seems reasonable, if it's not a safety-critical...

    Seems reasonable, if it's not a safety-critical process and it's OK to let them coast to a stop. If you have the budget for 66 tons of rotating mass, you certainly have the budget for a UPS.

    You...
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    If it runs well and the motor current is close...

    If it runs well and the motor current is close to, but doesn't exceed, the nameplate FLA when the air pressure's at its maximum, the pulley ratio is correct.

    You might move the boost transformers...
  21. I'm sure the essential questions are "How much...

    I'm sure the essential questions are "How much circuit capacity needs to be provided?" and "What's the appropriate OCPD size?"
    If the motor nameplate doesn't specify the full-load current at 200...
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    The best explanation I've ever seen is in the...

    The best explanation I've ever seen is in the book Wiring Simplified, from which this was copied:
    23169

    It is an excellent book for beginners.
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  23. What's the big deal? Every stapler I've ever...

    What's the big deal? Every stapler I've ever owned is cordless.
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    Where do the air-conditioning ducts go once...

    Where do the air-conditioning ducts go once they're on the other side of the ceiling? If the ducts are inside the insulated building envelope, I can't imaging any value to closing them. If the air...
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    I can. 2316523166 23167

    I can.

    2316523166 23167
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