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  1. Thread: Megger readings

    by Russ57
    Replies
    33
    Views
    1,493

    Rules of thumb can equal bad practice. Many...

    Rules of thumb can equal bad practice. Many would assume a 3 phase, 480 motor operates at 480 volts referenced to ground.....but it doesn't:) Since you have one end of the megger on ground you need...
  2. Thread: Megger readings

    by Russ57
    Replies
    33
    Views
    1,493

    You might find the following link helpful. ...

    You might find the following link helpful.

    http://www.biddlemegger.com/biddle/Lowdown-MC.pdf
  3. Replies
    43
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    1,844

    It does get a little cloudy at times:) There...

    It does get a little cloudy at times:)

    There are certainly positive displacment pumps with pistons. Then you have centrifugal chillers that compress refrigerant with an impeller.
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    21
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    762

    Your best bet will probably be a "shotgun"...

    Your best bet will probably be a "shotgun" approach. Call up True (800-424-TRUE) and give them model and serial number. You will want to buy the start capacitor, overload, and start relay. Those...
  5. Most walk in's have a "defrost termination and...

    Most walk in's have a "defrost termination and fan delay switch". This is mounted on the evaporator.

    When you go into defrost mode this switch lets the defrost heaters remain energized until the...
  6. Wait a second.....you mention something that we...

    Wait a second.....you mention something that we assume is a 115 volt home unit and next thing we know you are talking three phase. World of difference between something that is using a start cap and...
  7. Thread: Vacuum question

    by Russ57
    Replies
    7
    Views
    599

    Well....if you are at zero, or below as you have...

    Well....if you are at zero, or below as you have stated, and it stays that way, haven't you proven the valves hold?
  8. Replies
    39
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    1,990

    Funny how you can make a walk-in mantain temp...

    Funny how you can make a walk-in mantain temp with a tsat and still have a lot of things wrong. It is a little harder to do that with just a pressure control.

    Do yourself a favor. Learn how to...
  9. Replies
    21
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    1,652

    Yes, I am debating fighting it. But we have a...

    Yes, I am debating fighting it. But we have a great relationhip with the inspector and I'd like to keep it like that.

    A switch in series with the "4" terminal and the loads is the quick and dirty...
  10. Replies
    21
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    1,652

    I'm going to have to get up there and see what...

    I'm going to have to get up there and see what all I have. It turns out both evaporators are hard wired 208. Best I can remember, when I installed A419's in them, one had to be wired for 208 but...
  11. Replies
    21
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    1,652

    No. The 120 volt one just plugs into a ceiling...

    No. The 120 volt one just plugs into a ceiling mounted receptacle. The 208 volt one is all hardwired.

    Kinda looking to find out if NEMA 4X and/or low voltage is required.
  12. Replies
    21
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    1,652

    Always best to ask

    My fire department inspector says we need a switch inside the walk in freezers to kill the evaporator fans in case someone gets trapped inside.

    These are normal pump down type systems. One...
  13. Replies
    17
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    1,768

    Bigtime, just all depends on conditions...

    Bigtime, just all depends on conditions (temps/humdity/etc). You could get away with stuff in some parts of the country that would never fly in others.

    These days I wouldn't even design with a...
  14. Replies
    17
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    1,768

    You would always want primary flow to be larger...

    You would always want primary flow to be larger than secondary flow. You can violate that for short periods but doing so for any degree of time will cause lots of problems with humidity and such.
  15. Also.....lower voltage cause higher amperage "if"...

    Also.....lower voltage cause higher amperage "if" torque is required. In other words torque is proportional to square of voltage. Motors that are being started at reduced voltage are usually seeing...
  16. Replies
    19
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    2,749

    I would be careful saying a run capacitor's main...

    I would be careful saying a run capacitor's main job is to correct power factor.

    I'd rather say the capacitor shifts the phase of one of the windings so that the voltage across the winding is at...
  17. Replies
    7
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    1,014

    Not only is the voltage rating higher on the FNQ...

    Not only is the voltage rating higher on the FNQ series, the interupting current rating is WAY higher. If you don't know the importance of I.C. rating then best you make sure you always put the...
  18. This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  19. Thread: Pics for zw17

    by Russ57
    Replies
    0
    Views
    419

    Pics for zw17

    Here are the pics for the old tube base Barber Coleman controls. This particular one isn't on-line anymore but I do have some that are.

    As you can see I have quite a mix of different "vintages".
  20. Replies
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    6,401

    There is a reason why there are megger...

    There is a reason why there are megger tests....and then they are hi-pot tests.

    A megger test is supposed to be non-destructive. Every insulation class has a rating. We are supposed to be...
  21. Replies
    14
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    2,154

    For normal electrical stuff there is little...

    For normal electrical stuff there is little reason not to reference control voltages to ground. However there are a lot of valid reasons for floating neutrals and grounds. I work at a hospital and...
  22. Replies
    31
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    6,401

    I love my old hand crank Biddle. If buying new...

    I love my old hand crank Biddle. If buying new today I'd go AEMC.

    Match the megger to the voltage classes you work with. If you work on 4,160 motors you need a 5,000 VDC unit.

    IMHO top uses...
  23. Replies
    20
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    2,608

    Hmm, so now I'm a liar? Let me get through this...

    Hmm, so now I'm a liar? Let me get through this hurricane and I'll see if I can figure out how to post a pic.

    Pray tell, what is better about a 10mm?
  24. Replies
    33
    Views
    4,088

    A combination of PH, conductivity, and nitrate...

    A combination of PH, conductivity, and nitrate levels will give you an idea of how much you are leaking. Leave the regulator on. There is no such thing as too much water but you can certainly have...
  25. Replies
    18
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    2,116

    Yes, I did mean an EPR valve. BTW, thanks for...

    Yes, I did mean an EPR valve. BTW, thanks for the education above. I don't normally work on stuff quite like this.
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