fault finding earth loop impedance

[Gary80gas]

Ive been told testing the earth loop impedance (quality of earthing back to elec meter) as a part of electrics testing for boilers is important. My socket tester martindale ez150 tester measures this by series of lights. If its a low reading its ok,,if it lights up into hundreds ohms call electrician. Between these figures ive no idea at what point ive a problem that needs a sparks. Anyone using one understand correct use for heating engineers. Thanks to anyone who understands these testers.

 

[ShaunCorbs]

depends on what kinda of system thay have but for a max 100 ohms (tt system)

but normally its under 2 ohms

 

[Last Plumber]

There are different readings required for different installations and MCB's/fuses installed.

You need to make sure that you have those readings with you so you can tell if the installation is correct.

You are testing the earth back to and including the supply (external earth / neutral dependent on type )

 

[Last Plumber]

There are different readings required for different installations and MCB's/fuses installed.

You need to make sure that you have those readings with you so you can tell if the installation is correct.

You are testing the earth back to and including the supply (external earth / neutral dependent on type )

 

[Gary80gas]

The different readings for different installations? What are these figures or where do I find them? Thanks in advance.

 

[ShaunCorbs]

The different readings for different installations? What are these figures or where do I find them? Thanks in advance.

Best bet is utube mate or ask on the elec forum

Different systems are

Pe/ tns
Tncs
Tt

 

[ShaunCorbs]

The different readings for different installations? What are these figures or where do I find them? Thanks in advance.

Best bet is utube mate or ask on the elec forum

Different systems are

Pe/ tns
Tncs
Tt

 

[quality]

they are all in the 17th edition regs in section 4 but the max is determined by the supply system (type of earthing arrangement) also the circuit protective device i.e. mcb type or fuse type,