Reasonable test results

[ceraunic_level]

Anybody know where I can find the "reasonable" results for electrical tests

Its a college question

1. The expected test results for a three bedroomed house after complete re-wire (before connection of supply)

Continuity of CPC + main and supplementary bonding
Continuity of Ring Final circuits
Insulation Resistance
Polarity

2. Test results after connection of supply.

PFC
short circuit capacity
Functional testing

EFLI (Live test?)
Ze at origin
Earth electrode resistance

I have not done much testing yet and the OSG give min or max results, so I am unsure of what would be deemed reasonable readings for each of the tests

Cheers

 

[ricicle]

Look for resistance values of copper (at 20c) and then think about what the lengths of the circuits will be and you should get a reasonable idea. Don't forget the parallel issues with the good old Ring Final.

IR on a brand new installation - think about it................

hope this helps

 

[ceraunic_level]

Cheers

OK

Lighting circuit 1.5mm 10 metres


OSG says Resistance/metre or (R1+R2)/metre (mohm/m)

12.10mohms/m

If linked Line and earth at CU does that mean I only measure the one 10m from CU to fitting R1+R2 or do I measure 20m ( line and CPC)

If 10m the reading would be 121 mohms ??
20m 242 mohms ??

IR--- Could damage not be done during installation ?

 

[GaryMo]

IR on a brand new installation - think about it................

IR--- Could damage not be done during installation ?

Ricicle, i'm also a little lost as to what you're implying here

 

[GaryMo]

Lighting circuit 1.5mm 10 metres


OSG says Resistance/metre or (R1+R2)/metre (mohm/m)

12.10mohms/m

If linked Line and earth at CU does that mean I only measure the one 10m from CU to fitting R1+R2 or do I measure 20m ( line and CPC)

If 10m the reading would be 121 mohms ??
20m 242 mohms ??

1.5mm t&e?
If so, 1.5/1.0 cable has a resistance of 30.20 mohm/m

When measuring R1+R2 you're measuring the resistance of the line and cpc loop so:

(10 x 30.20)/1000 = 0.30ohms

 

[ceraunic_level]

Thanks very much for replies

 

[RF Lighting]

IR on a brand new installation - think about it................

IR--- Could damage not be done during installation ?

Ricicle, i'm also a little lost as to what you're implying here

I know exactly what ricicle is getting at.

Yes, damage might be done during installation, but that would be an UNreasonable result

 

[GaryMo]

Hmmm, maybe crawling around on my stomach under a floor for most of this afternoon reduced my detection of sarcasm

 

[securespark]

The suggestion is that there should be maximum IR between conductors.

 

[GaryMo]

Yes, I got it - 10 minutes after RF pretty much put it on a plate!