ZS at DB

[varilite]

How do you find the ZS at dis board, Ze is easy but how do you do ZS?

 

[varilite]

Well I suppose you could leave met connected and do test and call it zs

 

[mamba]

Thanks ipf I've come on here just for a double check before and get met with sarcasm and poor attitudes. I enjoy banter but sometimes certain members make you feel small for trying to ask for help in order to do a proper job.

Good Point well made as I get the same impression. I am right with you on this one. There are a lot of guys out there who believe they are gods gift to this forum and the electrical industry, who as you say only offer indifferent attitiudes, sarcasm and nothing of value.

Least we forgot we have at all times asked silly questions and still do today. We learn something new everyday and always continue to, and may possibly learn at times by asking a question no matter how stupid it may appear.

If we cannot on this forum offer any help sincerly to others then we are all the poorer for it.

 

[GLENNSPARK]

Zs at DB I believe is for a sub DB.

its refered to as Zdb

 

[mamba]

It is really very straight forward
Ze the the External Impedance of an istalllation and should be measured at the following points.

Domestic: At the incoming/supply side of the main switch in DB
Larger installs: At the incoming / supply side of the main Switch on Sub Main panel.

I am of the belief that it should be termed Zdb be a lot clearer and easier all round.
Also on test sheet a tick box verifing if MEC was able to be removed safely from MET for said Ze [Zdb] test.

 

[Stroppy]

Just make a number up that seems plausible, no-one's going to check it, and if they do then the installation has degraded/upgraded since the reading was taken.

 

[Guitarist]

Just make a number up that seems plausible, no-one's going to check it, and if they do then the installation has degraded/upgraded since the reading was taken.

Ahh, so it's your test sheets I keep coming across....

 

[bartkusal]

There should be no confusion at all on this one.

There is only one Ze at the installation, no mater domestic commercial industrial or whatever, and it is at the main incomer of supply, all the rest will be Zs Or Zdb, no matter how many boards you have, it is still not external is there? You may think, when you test at sub main DB, it seems like it is Ze, but it is Ze to that board only, but it is still in consumer installation, is there?

And don’t matter how you call the test at that particular DB, it is still the same test. Isolate that board first, and test the loop between incoming L and E, that’s all.