Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Main Forums
Electrical Inspection & Testing Forum
Earth Loop Testing (1/3)
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Talk Electrician Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="seajayess" data-source="post: 14222" data-attributes="member: 603"><p>Zs = Doing earth loop tests is to verify that the resistance is low enough to allow in the event of an earth fault, enough fault current to flow to cause the protective device to operate within the correct time. Tested at the furtherest point from the CU on each circuit.</p><p></p><p>Equipotential bonds should be tested to ensure that they are continuous and connected to the MET and the extraneous part. usually using the long lead method.</p><p></p><p>Ze = Is similar to the Zs but is taken from the main isolator, switched of and the main earth conductor removed from the MET the Ze is the resistance of the incoming supply and the main earth connection to the point of earth PME on a TNCS system around .35 ohms / the outer sheath on the supply cable on a TNS system around .8 ohms / and Earth on a TT system has to be less than 200 ohms, hope this helps CJS<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="seajayess, post: 14222, member: 603"] Zs = Doing earth loop tests is to verify that the resistance is low enough to allow in the event of an earth fault, enough fault current to flow to cause the protective device to operate within the correct time. Tested at the furtherest point from the CU on each circuit. Equipotential bonds should be tested to ensure that they are continuous and connected to the MET and the extraneous part. usually using the long lead method. Ze = Is similar to the Zs but is taken from the main isolator, switched of and the main earth conductor removed from the MET the Ze is the resistance of the incoming supply and the main earth connection to the point of earth PME on a TNCS system around .35 ohms / the outer sheath on the supply cable on a TNS system around .8 ohms / and Earth on a TT system has to be less than 200 ohms, hope this helps CJS:) [/QUOTE]
Insert quotes…
Verification
Post reply
Main Forums
Electrical Inspection & Testing Forum
Earth Loop Testing (1/3)
Top