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    The motor is a 1HP motor that is rated at 575V,...

    The motor is a 1HP motor that is rated at 575V, and a rated FLA of 1.5A. The service Factor is 1.25, it is a type 3428M and a XPFC enclosure. The fuses are 3A type CC. The overload is external,...
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    There are two motors on the same machine. One of...

    There are two motors on the same machine. One of the motors started doing this same thing, intermittently blowing the fuse, and it eventually completely failed. Now the other motor is starting to...
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    I unfortunately do not have that information,...

    I unfortunately do not have that information, though I really wish I did. You are asking what is the resistance reading with the motor not running? Or are you asking about the temperature of the...
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    Motor Failing--Is it the Insullation?

    I have a 3phase motor that is failing. What is happening is that it is intermittently shorting out and blowing the fuses. Would this be from failing insulation? I believe so, but I am a little...
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    If the machine drops below a certain temperature,...

    If the machine drops below a certain temperature, then the door heater would turn on. It is hard to say how much of the time could be spent above the temperature, and how much could be spent below...
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    Very helpful everyone, thanks.

    Very helpful everyone, thanks.
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    If I am switching the transformer several times...

    If I am switching the transformer several times in an hour, then I may have heat problems and would need to consider a larger transformer. That isn't the case here, so I believe I will be fine.

    I...
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    How many times would I be able to switch the...

    How many times would I be able to switch the transformer on/off before the inrush current damages the primary windings? Would it be 100's of times?
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    As long as it is not cycling very often, then...

    As long as it is not cycling very often, then switching the transformer on and off should not be an issue? I would need to switch downstream of the transformer's primary side overcurrent protection,...
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    Also, I know that IC transformers are wound so...

    Also, I know that IC transformers are wound so that there are less losses from inrush currents. I thought that in order to do this the IC transformer would have to be larger than a similarly sized...
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    I would have to add some relay logic to remove...

    I would have to add some relay logic to remove power from the transformer primary whenever it is not in use. I would rather not do this. It is a 350VA transformer, I would prefer to leave it...
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    IC Transformer: Small Load or No Load at All

    I have a 350VA industrial control transformer that will be used to supply 120V to door heaters inside a freezer. The heaters will not always be on, and could potentially be off for months at a time....
  13. Thanks, this was all very helpful.

    Thanks, this was all very helpful.
  14. Yes, overseas somewhere but could be anywhere...

    Yes, overseas somewhere but could be anywhere that has 230V 50Hz. The only 230V 50Hz I am concerned with at the moment is the standard 16A wall outlet variety---the overseas equivalent of US 120V...
  15. Do you think the same would apply to Asian...

    Do you think the same would apply to Asian countries?
  16. Ah yikes, too early, I realized when I was...

    Ah yikes, too early, I realized when I was brushing my teeth the error in what i justed typed....US 120 is split phase between a hot conductor and a grounded conductor. The question is still the...
  17. Is all international 50Hz derived from 400Y /230...

    Is all international 50Hz derived from 400Y /230 VAC? Or can I find some split phase 230VAC similar to our 120VAC that does not use a grounded neutral?
  18. Understood. If it were 240V 60Hz, here in the US...

    Understood. If it were 240V 60Hz, here in the US I would have to use a double pole breaker since neither line is grounded. I am making the assumption that ALL 230V 50Hz is derived from an...
  19. Primary Circuit Breaker for 230V 50Hz Transformer

    I have a transformer that will be used on a 230V 50Hz supply. It is my understanding that all 230V 50Hz is derived from a single ungrounded line conductor and a grounded line conductor. I know that...
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    12$$
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    It is a single phase general purpose transformer....

    It is a single phase general purpose transformer. The primary is 456VAC, and the secondary is 120-0-120. I have three circuits---two 120V circuits (Line to grounded center tap, and other line to...
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    But the only circuits using the neutral are the...

    But the only circuits using the neutral are the 120V circuits right? The 240V circuit is not using the neutral at all?
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    Transformer Over Current Protection

    I have a center tapped transformer with a 120-0-120 volt secondary. I have circuits on the 120-0, the 0-120, and the 120 to 120 taps. So, that equates to two 120V circuits and one 240V circuit.
    ...
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    UL 489 AND UL 98

    Are UL 489 MCCB interchangeable with UL 98 switches as a service disconnect? All the information that I am finding is showing that they are..
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    It looks like a valve, I believe it is called a...

    It looks like a valve, I believe it is called a "drain and breather", the one I am referring to is on top so it is a breather. These do not compromise the ability to contain an explosion?
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    Relief Valve on EXP Enclosure

    I have an explosion proof enclosure with a relief valve located on top. Why would this enclosure have a relief valve?
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