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
Insulation Testing 2/3
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: 14332" data-attributes="member: 603"><p>Low readings could also mean damp conditions or to just make it more confusing, I have been testing a factory PIR, couldn't switch off supply as some circuits couldn't be switched off. Consumer Unit had around 10 lighting circuits some with emergency lights. (example) circuit 1 MCB switched off confirmed dead, live Neutral and CPC removed R1+R2 taken 1.75 ohms insulation resistance L/CPC 0.056 ohms N/CPC 0.067 ohms L/N omitted do to to many lights to remove.</p><p></p><p>System wired in SWA and singles in Conduit to a switch bank PME connection.</p><p></p><p>Found out that when it was installed, at a switch bank they had only taken 1 Neutral and had used it for the neon indicators on the emergency lights on 2 different circuits, so the Neutral was connecting the Live to the Neutral through the second circuit through the PME connection back to the CPC giving all the low readings, took a while to trace but once I found it removed the Neutral at neon retested circuits L/CPC 675 M ohms N/CPC 700 M ohms hope this makes sense 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: 14332, member: 603"] Low readings could also mean damp conditions or to just make it more confusing, I have been testing a factory PIR, couldn't switch off supply as some circuits couldn't be switched off. Consumer Unit had around 10 lighting circuits some with emergency lights. (example) circuit 1 MCB switched off confirmed dead, live Neutral and CPC removed R1+R2 taken 1.75 ohms insulation resistance L/CPC 0.056 ohms N/CPC 0.067 ohms L/N omitted do to to many lights to remove. System wired in SWA and singles in Conduit to a switch bank PME connection. Found out that when it was installed, at a switch bank they had only taken 1 Neutral and had used it for the neon indicators on the emergency lights on 2 different circuits, so the Neutral was connecting the Live to the Neutral through the second circuit through the PME connection back to the CPC giving all the low readings, took a while to trace but once I found it removed the Neutral at neon retested circuits L/CPC 675 M ohms N/CPC 700 M ohms hope this makes sense CJS :) [/QUOTE]
Insert quotes…
Verification
Post reply
Main Forums
Electrical Inspection & Testing Forum
Insulation Testing 2/3
Top