Testing garage CU for assesment!!!

[swaley]

Hi guys I have my assesment in little over a month, and looking for some advice when testing my log cabin.
Do I need to fill out 2 test sheets. As my log cabin has it's own TT system. How would I measure Zs at my cabin? Im aware I Would only have Ze at origin DB.
Sorry been out the game a while and I'm aware I need to really brush up on my testing. Thanks

 

[Octopus]

Why is it a TT system ....

 

[Midwest]

What have you in your log cabin........electrical wise?

 

[swaley]

What have you in your log cabin........electrical wise?

I have run a SWA sub main to a 2 way CU. With separate earth rod. Power & lighting circuits

 

[Midwest]

As Murdoch said, why have you elected for TT? What supply does your main property have?

 

[swaley]

As Murdoch said, why have you elected for TT? What supply does your main property have?

My property has a PME system. I opted for this because I didnt want any problems to conflict with my main DB and be isolated to log cabin.

 

[Taylortwocities]

How does it connect at the house end.?
What is the configuration of the outhouse CU?

 

[Midwest]

Ok. Topic been discussed before on here, and will no doubt be talked about again. I think the consensus on here, is to use the earth supplied by PME system, unless that's something declined by DNO, extraneous pipework in shed/log cabin etc causing issue with bonding or its a hot tub etc. You should just have your rational for your assessment, as you might be asked. There is a download, on supplies to remote buildings, in the resources section, which discuss the options.

As regards testing, your Ze is at your origin (e.g. house CU), unless it has its own distribution circuit, and Zdb at the log cabin CU.

 

[Octopus]

What is the sub main connected to at the house?

 

[Richard Burns]

You have a new distribution circuit from the house supply.
Inspect, Measure and test that seperately.
Then you have a separate installation in the shed with an incoming supply from the distribution circuit and outgoing final circuits all RCD protected.
Inspect and test that as a separate item.
If I were filling out the paperwork I would list the distribution circuit as the first item on the schedule of test results and indicate that it was part of the house supply only.
However if I were doing it for an inspection then I would have two EICs, one for each section.

 

[westward10]

I agree with Richard, if you have a new distribution circuit then the new installation in the log cabin it maybe clearer to an assessor if you produce separate Certs due to the different earthing systems. Which ever way you do it as one Cert or two ensure it is clear especially if you opt for one.

 

[Taylortwocities]

if you have a new distribution circuit

Aren’t we waiting to find that out?

 

[davesparks]

My property has a PME system. I opted for this because I didnt want any problems to conflict with my main DB and be isolated to log cabin.

How does this isolate problems to the log cabin? Unless you’ve installed an isolating transformer in the supply to the log cabin I don’t see how you’ve isolated anything to the log cabin?

If you’ve designed the installation well then the protective devices in the log cabin will operate on any fault in there without affecting the main DB.

What is the Ra of the earth electrode you’ve installed?

 

[Midwest]

Why do I think the OP is unlikely to reply anymore. I do wonder sometimes chaps, if you look at your replies, why anyone is prepared to put their heads above the parapet and ask anything on this forum these days.

Perhaps we all need to get in touch with our feminine sides, present company accepted Sparkychick

 

[Taylortwocities]

I’m not hoping to Give him a hard time.
But want to advise on some famous areas where he can be tripped up (pun intended).