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  1. Replies
    21$$
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    254

    Are you thinking that a live-dead-live check or...

    Are you thinking that a live-dead-live check or similar could not be used on all electrical equipment and under any process condition? Please don't burst my bubble on this one!

    Hang on, maybe you...
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    21$$
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    Thanks don_resqcapt19. One issue I have faced...

    Thanks don_resqcapt19.

    One issue I have faced when talking to safety people is that isolation verification for mechanical works should be:


    simple
    the same on any electrical equipment
    the...
  3. Replies
    21$$
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    254

    Understood. Do you ever get a situation...

    Understood.

    Do you ever get a situation where its just inconvenient to try start eg material on a conveyor belt, very large motors with limited starts per hour etc?

    I assume execution of the...
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    21$$
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    Thanks don_resqcapt19. Certainly a more reliable...

    Thanks don_resqcapt19. Certainly a more reliable solution. How do you accommodate the possibility of jammed equipment in your procedure?
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    21$$
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    Thanks pfalcon. To be fair, I think fraymond was...

    Thanks pfalcon. To be fair, I think fraymond was referring to isolation for mechanical maintenance and therefor contact with parts that are sometimes energised, is not likely/impossible. On this...
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    21$$
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    254

    Arc flash is not really my area but given the...

    Arc flash is not really my area but given the number of isolations being performed are you comfortable that a try start is providing 100% accuracy, all of the time? For example could control circuit...
  7. I'm curious. What is being used other than Try...

    I'm curious. What is being used other than Try Start and Visible Break Isolators for the purpose of verifying isolations for mechanical maintenance?
  8. An extract from Western Mining Corporation's...

    An extract from Western Mining Corporation's notes on visible break isolators:

    Sighting all the physical breaks between the fixed and moving contacts of three phase isolating devices is not...
  9. Could it be that "A qualified person shall...

    Could it be that "A qualified person shall operate the equipment operating controls or otherwise verify that the equipment cannot be restarted." provides the flexibility to use other (potentially...
  10. My thoughts WarAxe... Largely agree. If...

    My thoughts WarAxe...



    Largely agree. If you can't use the same technique under all circumstances then what good is it? There are two situations where it is partially useful. Firstly, In the...
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    2$$
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    Couldn't agree more. Locking off is one thing,...

    Couldn't agree more. Locking off is one thing, verifying the isolation, releasing energy etc are other significant aspects of LOTO that you would learn during training also.
  12. Firstly, I assume you mean electrical work on the...

    Firstly, I assume you mean electrical work on the electrical pump (live-dead-live check required) rather than non-electrical work on the electrical pump (effective isolation test required. Not...
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    5$$
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    Some other things to think about... Q1. For...

    Some other things to think about...

    Q1. For electrical work - no for regulatory and welded phase contact reasons. For non electrical work - perhaps. Possible issues include jammed pump shaft...
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    15$$
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    Sounds like this is territory familiar to you as...

    Sounds like this is territory familiar to you as well GoldDigger!

    Of course doing voltage tests at CBs inside MCCs introduces its own dangers like you have suggested. So too does test points on...
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    15$$
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    Could not have said it better myself GoldDigger. ...

    Could not have said it better myself GoldDigger.

    If the LOTO disconnect is faulty, and there is an intermediate disconnect that is open at the time of the voltage test at the load, the voltage...
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    15$$
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    No arguments from me either. Just making a...

    No arguments from me either. Just making a suggestion as to the reason for permanent voltage indicators and how confusion may arise in the mind of a sparky given their wide spread use. As you have...
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    15$$
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    I suspect RichB, the confusion relates to...

    I suspect RichB, the confusion relates to verification for the two different types of work 1. electrical work and 2. non-electrical work.

    In Australia, and I am pretty sure the US also, in the...
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    15$$
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    Just a couple of comments regarding the...

    Just a couple of comments regarding the permanently installed voltage indicators:



    Sites generally justify permanently installed voltage indicators for isolation verification prior to...
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