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  1. Replies
    49$$
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    3,278

    Yes I agree unplugging provides the best...

    Yes I agree unplugging provides the best assurance of isolation. However, in too many cases it is impractical and costly therefore it may be difficult to regard it as sensible solution let alone a...
  2. Replies
    49$$
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    3,278

    As I confirmed, it is not a big issue in...

    As I confirmed, it is not a big issue in isolation.

    But just to respond to your last point, the equipment that has been unplugged (not directly connected to the power system earth) is being...
  3. Replies
    49$$
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    3,278

    Ah yes but what happens on a maintenance down day...

    Ah yes but what happens on a maintenance down day when multiple items are unplugged? Each one you isolate removes another return path. In the industries where I work group isolations on shutdown...
  4. Replies
    49$$
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    3,278

    Yes the touch voltages come from other energised,...

    Yes the touch voltages come from other energised, faulted equipment and it uses the conductive process elements eg pipes together with their electrical earth connections to return earth fault loop...
  5. Replies
    49$$
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    3,278

    Ok I have reached the limit of my expertise on...

    Ok I have reached the limit of my expertise on North American installation practices on this one. It didn't take much. My apologies I was referring to constraints relating to Australian (European)...
  6. Replies
    49$$
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    3,278

    Yes Don this method provides a high integrity and...

    Yes Don this method provides a high integrity and simple isolation but it introduces so many more issues eg:



    Regular people contact with cables
    Damage to plugs and sockets when dropped
    ...
  7. Replies
    49$$
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    3,278

    Yes that mirrors what happens in Australia. ...

    Yes that mirrors what happens in Australia. Further to that, in order to save costs, many new plants don't incorporate field HOA switches and visible break isolators. Mode selection is performed by...
  8. A couple of questions: Do test points on the...

    A couple of questions:

    Do test points on the outside of the panel introduce a safety issue?
    How is it that LEDs going out verify that the LEDs work? Couldn't a wire dropping off or an LED...
  9. Replies
    59$$
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    5,505

    For a left field view, Don's (OSHA's) approach is...

    For a left field view, Don's (OSHA's) approach is similar to what's done in my neck of the woods. Your personal lock protects you only hence its name. If you are not on site then your lock is not...
  10. Replies
    49$$
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    3,278

    Thanks Don. So in the event of an isolation for...

    Thanks Don. So in the event of an isolation for electrical work do you use Try Start to match the field equipment to the MCC equipment? So in summary, for each lockout you could:


    Try Start...
  11. Replies
    49$$
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    3,278

    I guess you could attempt a Try Start prior to...

    I guess you could attempt a Try Start prior to locking out, to prove that there is no problem with the manual start circuit. In that way you reduce your exposure to an incorrect Try Start result...
  12. Replies
    49$$
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    3,278

    OK I got the impression that the thread was...

    OK I got the impression that the thread was largely about non-electrical work. My apology.

    Yes I received the same impression about "pilot light type devices, even the ones with multiple lamps...
  13. Replies
    49$$
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    3,278

    OK RightSwitch certainly won't because its aim in...

    OK RightSwitch certainly won't because its aim in life is to match an MCC isolation point with the equipment in the field ie remote indication. It doesn't do the proof of de-energisation part.
    ...
  14. Replies
    5$$
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    473

    Agree 100%. But what about a non-contact, 3...

    Agree 100%. But what about a non-contact, 3 phase, permanently installed voltage indicator that incorporates a self test function? It seems that this clause does not prevent such a device's usage....
  15. Replies
    49$$
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    3,278

    Am interested in your opinion on the RightSwitch...

    Am interested in your opinion on the RightSwitch / DeadEasy approach.
  16. Replies
    49$$
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    3,278

    Could these devices introduce a weak point in...

    Could these devices introduce a weak point in your power system? Best to check the over voltage category on them before installing.
  17. Replies
    49$$
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    3,278

    Many take the view for the above reasons that you...

    Many take the view for the above reasons that you really need to verify that the disconnect is off rather than rely on Try Start. That way you don't need to worry about control circuit elements or...
  18. Replies
    11$$
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    1,524

    I note that this one is now discontinued and the...

    I note that this one is now discontinued and the 3000FC replaces it. In addition, they now quote a range of 3.5m outside a panel door so my apologies. A comparison we had done previous revealed:

    ...
  19. Replies
    11$$
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    1,524

    No. Good point. I should have mentioned that. ...

    No. Good point. I should have mentioned that. To be honest we were a bit surprised at the success we had. On some panels we achieved 30m range! All panels we tested on had gaskets. We hope to...
  20. Replies
    11$$
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    1,524

    Perhaps I'm wrong but the the Fluke device is...

    Perhaps I'm wrong but the the Fluke device is single channel which means you need a few of them if you want to do normal circuit fault finding otherwise you'll be forever switching off, opening up...
  21. Replies
    11$$
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    1,524

    OK at the risk of sounding like an advertisement...

    OK at the risk of sounding like an advertisement we have designed and sell a device that may be of use. It measures up to 8 channels of AC or DC voltage at up to 300V with respect to neutral. It...
  22. Some might say that the reasoning in the...

    Some might say that the reasoning in the interpretation is flawed eg....

    "One effective method of compliance would be a deliberate attempt by an authorized employee to start up the equipment,...
  23. Thank you umichEE. I agree, OSHA has taken a...

    Thank you umichEE. I agree, OSHA has taken a firm position on this topic. As you may have read in earlier posts in this thread OSHA's logic may not be entirely bullet proof. Some designers may...
  24. Agree 100%. This device is suitable for...

    Agree 100%. This device is suitable for verification prior to mechanical work only. Incidentally, which happens to be the most frequent reason why isolations are performed.
  25. First a disclosure. I am involved in the...

    First a disclosure. I am involved in the development of the solution and as this is a no advertising forum (as it should be) I will provide some hints as to the solution rather than website links to...
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