Main Bonding In Place who Checks every time ZE should be tested each time too...

[monkee]

I saw the thread about the main bonding checks it got me thinking back to my house bashing days for the local authority they insisted that you checked the ZE or ZS call it what you wish .

The MET point take a reading making sure that you have disconnected all main bonding first make a note if all ok then proceed what ever job you had to do, be it light switch change to a full rewire.

now this is good pratice but I bet know one does it,:75: should we be doing it or not any thoughts...

 

[Plonker 3]

Does anyone write their Ze readings near the CU? A couple of jobs we've been on before the previous installer had written the Ze reading he took for all to see

I often write the Ze and location of bonding clamps/ earth rod on the bus bar guard in permanent marker.

But how does the next electrician that turns up know it is correct? Anyone could write that information down.

 

[marcusone]

But how does the next electrician that turns up know it is correct? Anyone could write that information down.

Oh it's not for anyone else Dillb, just my own reference. Its an age thing. Next spark shouldn't assume it's right anyway, I never assume circuits are labelled correctly by previous installers.:smiley2:

 

[Thefailsafe2012]

Yeah thought it was an odd thing to do, you never know what's going to be changed to affect that reading, only seen it a couple times so maybe it was one of your installs Marcus haha

 

[Guest55]

on larger commercial installs i'd expect to see the Ze / Zdb recorded on the switchgear.
it can be difficult to get an accurate earth loop reading without disconnecting earth conductors / dismantling live equipment so having some thoughtful spark mark it on the enclosure somewhere is a bonus if you ask me.

 

[pete555]

I often write the Ze and location of bonding clamps/ earth rod on the bus bar guard in permanent marker.

first port of call ZE reading and check bond like you i always write them down for next person although i would also expect them to check themselves in case readings have changed do you think we are too trustworthy

 

[KWCFC]

Out of interest, what sort of reading suggests that the earth is faulty and what would you do to fix it once you find that it is?

I'm a learning apprentice before you ask!

 

[Plonker 3]

Depends on the earthing system used

TNC-S 0.35
TN-S 0.8
TT BS 7671 recommends a value below 200 ohms, but you should aim for a value alot lower than that.

If it is a TN-C-S or TN-S the it is unto the DNO to maintain the earth so if the value is above those above you should inform them ASAP so they can repair it.

On a TT then all you can do is get some more rods and put them in.

 

[KWCFC]

Depends on the earthing system used

TNC-S 0.35
TN-S 0.8
TT BS 7671 recommends a value below 200 ohms, but you should aim for a value alot lower than that.

If it is a TN-C-S or TN-S the it is unto the DNO to maintain the earth so if the value is above those above you should inform them ASAP so they can repair it.

On a TT then all you can do is get some more rods and put them in.

Nice one. Cheers for that

 

[monkee]

no i am not saying that they dont but i am refering to another thread as well, all good spread help and training not bitching and back stabing that seems to happen on this site from time to time LOL

 

[Tomhw100]

all ways check ze and make sure any circuit ive replaced an accessory on is tested....its absolute standard practice to me! always check bonding to.

 

[trev]

If you go to survey a job and carry out the checks that you should be doing it tends to create a good impression with the client that you're conscientious about your work especially if you explain why you're doing it.

 

[mark ju]

When replacing an electric shower, I always do the full range of tests on the circuit, mainly because it's such a high-draw appliance and also it will be handled when wet and naked! If changing sockets or light fittings I like to check ring/earth continuity for piece of mind. And I wouldn't issue a cert for changing a light fitting or socket, but would for the shower!

Well i've changed a few showers but never felt the need to get wet and naked to do so.

 

[Andy78]

Well i've changed a few showers but never felt the need to get wet and naked to do so.

You're not enjoying your job properly.