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
Do-It-Yourself (DIY) Question & Answer Forum
Another "impossible" fault thread
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="apprentice87" data-source="post: 199129" data-attributes="member: 13534"><p>Hmmm, let me try beginners luck again!! [i must be mad!!] You isolated the house at the CU. This is a DP switch/disconnector, that presumably worked. You said you did not do a "proper" deadness [for want of a better word] check, but everything went off.</p><p></p><p>Now then, it appears that the CPC was still live.......Hmmmm..... well.... if the CPC is live, then the earth bar in the CU must be live too. The earth bar is connected to the MET, so that must have been live too, and that is connected to the neutral [as it is pme]</p><p></p><p>Sooooo, how is it live???</p><p></p><p>Either the earthing conductor was not [conducting that is!!] and the MET was bonded to an incoming service that was live some how,</p><p></p><p>or,</p><p></p><p>The MET was not bonded to "earthy" incoming services, [all plastic in a newish house] and the neutral that the MET is connected to ij the cutout [cos its pme] was not as "neutral" as one would like!!</p><p></p><p>Soooooo, something wrong with the incoming PME but the house holder did not notice as, well, he would not if all the metalwork was bonded to the MET as it would all be the same potential. [unless he went out side with his ancient class one black and decker!!]</p><p></p><p>All i can think of!!</p><p></p><p>Do not all laugh at once!!!!!!!!!!!!!!!!</p><p></p><p>john</p></blockquote><p></p>
[QUOTE="apprentice87, post: 199129, member: 13534"] Hmmm, let me try beginners luck again!! [i must be mad!!] You isolated the house at the CU. This is a DP switch/disconnector, that presumably worked. You said you did not do a "proper" deadness [for want of a better word] check, but everything went off. Now then, it appears that the CPC was still live.......Hmmmm..... well.... if the CPC is live, then the earth bar in the CU must be live too. The earth bar is connected to the MET, so that must have been live too, and that is connected to the neutral [as it is pme] Sooooo, how is it live??? Either the earthing conductor was not [conducting that is!!] and the MET was bonded to an incoming service that was live some how, or, The MET was not bonded to "earthy" incoming services, [all plastic in a newish house] and the neutral that the MET is connected to ij the cutout [cos its pme] was not as "neutral" as one would like!! Soooooo, something wrong with the incoming PME but the house holder did not notice as, well, he would not if all the metalwork was bonded to the MET as it would all be the same potential. [unless he went out side with his ancient class one black and decker!!] All i can think of!! Do not all laugh at once!!!!!!!!!!!!!!!! john [/QUOTE]
Insert quotes…
Verification
Post reply
Main Forums
Do-It-Yourself (DIY) Question & Answer Forum
Another "impossible" fault thread
Top