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  1. Or the system came from overseas where they use 2...

    Or the system came from overseas where they use 2 pole breakers where one pole is just a switch for the neutral. Lot's of foreigners get really confused about how we do things here. They adapt their...
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    4$$
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    162

    As to the specific breaker issue, what happens is...

    As to the specific breaker issue, what happens is that the ATS mfr only submitted it to UL (or some other NRTL) with that specific breaker, not wanting (or knowing) to pay extra for the testing...
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    12$$
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    615

    This is your best bet. As stated, there are...

    This is your best bet. As stated, there are possible issues with NC valves being held open continuously, but for 'fail safe" situations as you described, there really isn't a good viable solution...
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    2$$
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    It means the range can be BETWEEN 120V and 277V....

    It means the range can be BETWEEN 120V and 277V. So yes, 240V is fine, as is 208V.
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    19$$
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    1,188

    I've seen numerous projects wherein spare fuses...

    I've seen numerous projects wherein spare fuses were REQUIRED to be stored in the fused disconnect enclosure.

    Overreach...
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    14$$
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    661

    If the motor was single phasing, it would not...

    If the motor was single phasing, it would not rotate at startup, unless there is something mechanically rotation it already, such as wind on a fan. But if it is a fan, it would likely run longer...
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    7$$
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    560

    There are probably a dozen or so different kinds...

    There are probably a dozen or so different kinds of AC single phase motor variations, only two of which can be speed controlled with "dimmer" like devices, and of those, not all dimmer like devices...
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    36$$
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    1,969

    Methinks you have inherited a box fill violation...

    Methinks you have inherited a box fill violation and if you have to add anything there, you may own it now even though the last guy (or last 5 guys) that put things in there should have owned it and...
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    That was how I learned it! :thumbsup: Later (but...

    That was how I learned it! :thumbsup:
    Later (but still prior to the age of PCs) we were able to photocopy onto clear plastic sheets used for overhead projectors which made it even easier.
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    4$$
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    334

    There is no NEC requirement for it, neither is it...

    There is no NEC requirement for it, neither is it required in UL or other design / testing specifications. But it falls under "prudent design considerations" because if you use ONLY the electrical...
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    14$$
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    526

    Very confusing thread; let's try to clarify: ...

    Very confusing thread; let's try to clarify:

    So you HAVE a 208V 3 phase system, right?

    They WANT you to supply their equipment with 240V 3 phase, is that right?

    If so, on that 240V system,...
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    10$$
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    1,418

    A "corporate safety guy" is going to institute a...

    A "corporate safety guy" is going to institute a layoff? And if so, he is going to pick you out for layoff because you asked for proof of the LACK of a safety requirement?

    Any employment lawyer...
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    2$$
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    I moved this from the Engineering forum to here...

    I moved this from the Engineering forum to here because it is likely more related to CEC issues.
  14. Yes, the exclusion of

    Yes, the exclusion of <50HP is relating to MV motors under 50HP, which basically don't really exist anyway. That ECM article had a typo in stating that C37.010 applied to "high voltage systems of...
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    20$$
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    779

    Delta systems and VFDs are bad news. Any ground...

    Delta systems and VFDs are bad news. Any ground fault on the delta system runs a risk of damaging the VFDs (the same is true for 3 phase UPS systems and low-end soft starters). If you remove the...
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    8$$
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    415

    Well, they are being a little lazy in that if...

    Well, they are being a little lazy in that if someone wanted to TOTALLY design an AC induction motor from scratch, it could be done. You may not want to pay the one-off cost for that, but that was...
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    20$$
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    Is this some sort of temporary setup? Because you...

    Is this some sort of temporary setup? Because you know that you can't use SO cord for permanent wiring, right?
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    20$$
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    787

    They (breaker mfrs) also have little dirt cheap...

    They (breaker mfrs) also have little dirt cheap 60A panels that just hold 2 or 4 breakers.
    22527
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    24$$
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    1,200

    Close, but not exactly the same. In a triac there...

    Close, but not exactly the same. In a triac there is one "gate" that turns the whole circuit on, like closing a contact. With back-to-back SCRs, each SCR has its own gate circuit and can be...
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    14$$
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    853

    Personally I don't like using UF indoors simply...

    Personally I don't like using UF indoors simply because it's a PITA to strip compared to NM, but that's just me... There is no legal prohibition from using it the same as NM.
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    24$$
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    1,200

    You set your meter to AC. But again, if it’s a...

    You set your meter to AC. But again, if it’s a Zero Cross Proportional control, what you read will look erratic.

    gar,
    I read that again and they say the SCR switches off when CURRENT passes...
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    89$$
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    3,127

    Different rules outside of North America... Plus,...

    Different rules outside of North America... Plus, they NEVER have Delta power systems, they are ALWAYS Wye (what they call Star). So a 415V system is ALWAYS 415Y240V and it is never more than 240V...
  23. Thread: Home Inspectors.

    by Jraef
    Replies
    23$$
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    1,213

    Termite (pest) inspectors must be licensed and...

    Termite (pest) inspectors must be licensed and bonded in California from the Dept. of Commerce Structural Pest Control Board. Roof inspectors must be licensed as well.

    Home inspectors though, no...
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    24$$
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    1,200

    What is AC? It is DC that can't make up its mind...

    What is AC? It is DC that can't make up its mind which way to go...

    The point is, technically because you are switching on only 1/2 of each sine wave with each SCR, the output of a single SCR is...
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    13$$
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    865

    It looked to me as though those taped conductors...

    It looked to me as though those taped conductors were coming from the top lugs on the breaker, I don't see then continuing over to the right to get to the vertical wireway. Also, normally you can see...
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