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
Cable Calc Question
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="binky" data-source="post: 301165" data-attributes="member: 490"><p>personally i would lift cable above insultion. However that's not what you are asking. The insulation is clearly biggest issue in derating cable, and is the part of the run you need to focus on as this is the worst case scenario. If table says cable can carry 45A under the condtions of installation described, then IMHO you can work with that. 45A MCBs are available, MK do one,and will probably cope perfectly well with the 45.7A load calculated at 230V - the point is correctly protecting the cable, and not so much the loading. But you will have to be wary of adding further insulation to loft (270mm is now recommeded), so i think I would go back to lifting cable above insulation, which means you could use easily available 50A MCB and never have to worry.</p></blockquote><p></p>
[QUOTE="binky, post: 301165, member: 490"] personally i would lift cable above insultion. However that's not what you are asking. The insulation is clearly biggest issue in derating cable, and is the part of the run you need to focus on as this is the worst case scenario. If table says cable can carry 45A under the condtions of installation described, then IMHO you can work with that. 45A MCBs are available, MK do one,and will probably cope perfectly well with the 45.7A load calculated at 230V - the point is correctly protecting the cable, and not so much the loading. But you will have to be wary of adding further insulation to loft (270mm is now recommeded), so i think I would go back to lifting cable above insulation, which means you could use easily available 50A MCB and never have to worry. [/QUOTE]
Insert quotes…
Verification
Post reply
Main Forums
Do-It-Yourself (DIY) Question & Answer Forum
Cable Calc Question
Top