Testing pipe work

[Lilyrose08]

Hi All - What test can you carry out and how to find out whether exposed copper pipe work requires bonding ?????

 

[monkeyelectric]

Ir between it and MET

 

[bartkusal]

Not sure are you up to date with this forum, but the best man to ask is COCKBURN

 

[Lilyrose08]

Yeah value should you expect if it does not need bonding

 

[monkeyelectric]

Above 22kohms

 

[Lilyrose08]

So under .22Mohms needs bonding

 

[monkeyelectric]

Indeed!Actually its 0.022 Mohms

 

[bartkusal]

So under .22Mohms needs bonding

kohms that is

 

[brizospark]

Should this not be 22kohms?

 

[monkeyelectric]

Should this not be 22kohms?

Like i said above, it equates to 0.022 Mohms

 

[brizospark]

Monkey, as above, you stated mohms (milliohms) which should actually have been Mohms (Megaohms)

 

[monkeyelectric]

Monkey, as above, you stated mohms (milliohms) which should actually have been Mohms (Megaohms)

Get a life will you!

 

[Sintra]

This is how the 22Kohm figure is obtained
Rcp>(Uo/Ib)-Ztl
where:
Rcp is the measured resistance between the conductive part concerned and the MET of the installation (in ohms),Uo is the nominal voltage to Earth of the installation (in volts), Ib is the value of current through the human body (or livestock) which should not be exceeded (in amperes), and Ztl is the impedance of the human body or livestock (in ohms).

Guide to effects of current on human beings and livestock provides data for Ztl and Ib. For hand-to-hand contact, the value of the body impedance is given as 1000 Ohms in dry conditions where Uo is 230 V. You can then select a value of Ib between the two extremes:0.5 mA – the threshold of perception and 10 mA – the let-go threshold

Rcp>(Uo/Ib)–Ztl=(230/0.01)-1000=23000–1000=22Kohms

 

[RmBo_0]

Or

If you've read Christopher kitcher's practical guide to inspection, testing and certification of electrical installations he simplifies it slightly.

Page 40 - 41

 

[bartkusal]

Monkey, as above, you stated mohms (milliohms) which should actually have been Mohms (Megaohms)

I can't see where he states that, are you sure that you Pc allows to see the capital leters...

 

[DPG]

I can't see where he states that, are you sure that you Pc allows to see the capital leters...

I think he corrected it afterwards - see the 'edited' bit at the end. Daz

 

[bartkusal]

I think he corrected it afterwards - see the 'edited' bit at the end. Daz

I know, is not that, It was directed to other guy with his mili ohms statment, monkeyelectrics is correct at everything he said...