Resistance to earth preliminary check

[Reg Man]

Surely your just checking Zs. Is there a sufficient path to earth?

 

[combo]

Surely your just checking Zs. Is there a sufficient path to earth?

Earth continuity ( Earth to case ) was fine and there was equipotential bonding at meter....there was an earth path. I think I've just been thrown out by the fact that I never got my O.L ( infinity reading ), for some reason these Alphas mustn't show it, instead, you get the high resistance reading. I'll just have to take Village's advice and put it down to dodgy readings on the day, if they come asking about it.

 

[Reg Man]

Quote>Earth continuity ( Earth to case ) was fine and there was equipotential bonding at meter....there was an earth path.<Quote. But is it earthed to ground. ZS and ZE?

 

[combo]

ZS and ZE are beyond me. I don't want ppl thinking that I was fiddling about with mains wiring. All I'm talking about are the rudimentary preliminary electrical checks that I was told in college and at British Gas...short circuit, resistance to earth and polarity at appliance.
REG, this ZS and ZE business, do you think this could account for me not getting the O.L on my meter ?

 

[AWheating]

ZS and ZE are beyond me. I don't want ppl thinking that I was fiddling about with mains wiring. All I'm talking about are the rudimentary preliminary electrical checks that I was told in college and at British Gas...short circuit, resistance to earth and polarity at appliance.
REG, this ZS and ZE business, do you think this could account for me not getting the O.L on my meter ?

It should have no effect if you isolated the appliance from the supply by removing the plug or turning off the double pole isolation. As you say zs is beyond what is in the remit of "work" on an appliance. In an ideal world you would measure the fault loop of the supply to the appliance but you could also remove the appliance and check the fixing in the wall, how far does one go? As far as the amount your being paid to do the work.

 

[Reg Man]

Just check the earth connections are connected and do a local resistance test across the boiler to the spur or plug.

 

[Nostrum]

A true insulation resistance test require's a specific test voltage, normally twice that of the nominal voltage. Multimeters are volt free so I'm not sure what the readings should be or how accurate they would compare to fixed wiring standards.

 

[Ermintrude]

Real way to do it is connect ignition electrode to live and hold earth, 10,000v DC . If there is an earth fault you will need clean pants.

 

[AWheating]

Real way to do it is connect ignition electrode to live and hold earth, 10,000v DC . If there is an earth fault you will need clean pants.

i just go to work in dirty pants, then im not supprised or disappointed when this happens. :82::asshole:

 

[combo]

Real way to do it is connect ignition electrode to live and hold earth, 10,000v DC . If there is an earth fault you will need clean pants.

I always carry a spare pair for emergencies !
I hate electric shocks. I there used to be a evil lil runt in college years ago, who'd charge up a capacitor on a megger and sneak up behind and discharge it on ya....

 

[village idiot]

ZS and ZE are beyond me. I don't want ppl thinking that I was fiddling about with mains wiring. All I'm talking about are the rudimentary preliminary electrical checks that I was told in college and at British Gas...short circuit, resistance to earth and polarity at appliance.
REG, this ZS and ZE business, do you think this could account for me not getting the O.L on my meter ?

If you keep this up, you will soon want to do an Earth Loop Impedance test 😀 I'd just leave it at that and wait for their engineer to give me a 'ticking' and tell me what the problem was

 

[arran197]

We're supposed to do these checks too, but if there's anything wrong just walk away and get the owner to sort it out. I think I'd have done the same, just wouldn't have switched the boiler off.

 

[Dev1872]

I was taught Live to Earth, greater than 1 mega ohm was reading you were looking for.

 

[GrahamM]

Depending on metre you are using you looking for overload (ol) which means the resistance is that high the meter pcan't read it or a reading of over 1 mega ohm ie 1000000 ohms which is readings you have.