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

  • State Helpful Answer
  • Replies 16 replies
  • Subscribers 38 subscribers
  • Views 2697 views
  • Users 0 members are here
Options
You may also be interested in

Legacy Installation EICR

Owelly

Greetings all.

Hopefully this will be an easy one for the hive mind, and I've tried the 'Search' but to no avail:

I manage an old industrial complex built in 1960. During the EICR testing most of the fixed wiring circuits have failed the insulation tests, with readings of less than 1Mohm. These cables are all MICC and have been untouched since installation. To replace all these cables would be an epic task and these works would need to be done in the next three months to satisfy the handover of the premises to the landlord.

Is there a method to test these 'legacy' cables other than to test to current standards (500v)? Istr mention of testing such cables at 50v but I can't find where I saw this. Is there a method to implement mitigation measures instead of replacing all the cables, or spending many hours isolating sections to fault find?

As you may be able to tell, I'm no electrician and every contractor I've approached has insisted that the entire building needs to be recabled, which isn't currently viable.

Thanks.

Parents
  • +1

    What sort of values are you getting? And for what sort of circuit lengths?

    I'd start by pointing out that 1M is the minimum standard expected for the initial verification of new installations - BS 7671 doesn't explicitly say that the same should be expected for periodic inspections. Do the readings suggest that safety of the installation is impaired?

       - Andy.

Reply
  • +1

    What sort of values are you getting? And for what sort of circuit lengths?

    I'd start by pointing out that 1M is the minimum standard expected for the initial verification of new installations - BS 7671 doesn't explicitly say that the same should be expected for periodic inspections. Do the readings suggest that safety of the installation is impaired?

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Thanks for the reply. The report just shows <1M so that's all the information I have. The main culprits are the lighting circuits and the building is 70m x 40m so the runs are typically 30m(ish). The circuits are all protected so imho, the safety of the installation isn't impaired. As you say, the BS7671 doesn't explicitly reference the difference between new and existing wiring, but how do I present that to our landlord?

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