Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 48 replies
  • Subscribers 26 subscribers
  • Views 1820 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Safe Disconnection to Undertake Work.

Zoomup
Scene. An old farm building now used as a double glazing frame maker's workshop.


The supply comes from an old shed about 40 metres away, where the meter is. The old shed has some 70s/80s rusty M.E.M. isolators that feed several S.W.A. cables that exist the shed in many directions underground. I suspect that one feeds the main farmhouse, another a rented cottage and the others various farm buildings. There is no clear labelling of the isolators.


What is the best way to locate the frame maker's  building supply where I have to work?


Somewhere I have a circuit i/d set, if I can find it, but that will need access to the live parts and I do not wish to turn off the wrong isolator.


Z.


Parents
  • 0
    I think I was not clear in my texplanation. there are two approaches I can think of  to 'unbalance' the  SWA, then a clamp meter will see it. By trying to be terse, I have not separated them.

    Either you need a fault from the far end live to earth - current into either  an electrode or better a wander lead that is going back to supply earth but not via the SWA, or a similar wander lead loop, but to inject current into the armour that way with a small transformer or sig gen.

    M.
Reply
  • 0
    I think I was not clear in my texplanation. there are two approaches I can think of  to 'unbalance' the  SWA, then a clamp meter will see it. By trying to be terse, I have not separated them.

    Either you need a fault from the far end live to earth - current into either  an electrode or better a wander lead that is going back to supply earth but not via the SWA, or a similar wander lead loop, but to inject current into the armour that way with a small transformer or sig gen.

    M.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines