Testing back to origin on large installs

[flyingsparks]

Done a job at a large industrial site. Installed two fans (2A FLC) and two starters for them off an existing 3Ph DB which had a spare way.

In the past I had always been under the impression that the EIC should have test results for every submain and sub board right back to the origin. Well on this job, that is simply not possible because the board we connected into is on about 3 Submains, fed from a switch fuse and busbar chamber.

We are simply not going to be able to shut down the entire plant to take these readings and take a Ze at the origin. I know the Ze could be noted from enquiry and put on the EIC, but what would you do in this situation? Is it OK to just have the new circuit we installed and the details of the origin, and note this on the EIC?

 

[ericmark]

Write on limitations that tested to XYZ board only. As long as you state limitations there is really no problem.

 

[JohnW2]

We are simply not going to be able to shut down the entire plant to take these readings and take a Ze at the origin. I know the Ze could be noted from enquiry and put on the EIC, but what would you do in this situation? Is it OK to just have the new circuit we installed and the details of the origin, and note this on the EIC?

I'm sure that far more appropriate others than myself will give you a 'bureaucratic' answer but, in common sense terms, isn't it the ('overall') Zs of your new circuit which really matters, regardless of Ze or or what is going on in the various submains?

Kind Regards, John

 

[flyingsparks]

We are simply not going to be able to shut down the entire plant to take these readings and take a Ze at the origin. I know the Ze could be noted from enquiry and put on the EIC, but what would you do in this situation? Is it OK to just have the new circuit we installed and the details of the origin, and note this on the EIC?

I'm sure that far more appropriate others than myself will give you a 'bureaucratic' answer but, in common sense terms, isn't it the ('overall') Zs of your new circuit which really matters, regardless of Ze or or what is going on in the various submains?

Kind Regards, John

Thats exactly what I thought. I think a bit of common sense needs to come in on a job like this. If the original installation looks old, bodged or damaged then obviously a more thourgha test is required. If it all looks in good condition then I think I will just put it as a limitation.

 

[Spark123]

They ought to do their own testing as part of an on going maintenance regime, just LIM it.
I too come across plants where there is no (safe) way of powering off to do a Ze test.