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richy3333

richy3333

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You mentioned never having seen a domestic CU that had been wired entirely as RFCs. I just found these pictures. It was a DIY/homeowner self build. The far left circuit is the only radial - a feed to the shed!

[ElectriciansForums.net] For Wirepuller

[ElectriciansForums.net] For Wirepuller
 
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Engineer54 said:
Derating?? ...For what reason??
Click to expand...

Sorry the 85% is a typo, it should be 95%. (I had to dig my apprentice log book out for that.)

As you know I started under M&Q regulations working for a multinational. The central engineering department issued their own standards. I based it on that.

The first major install I was involved in had numerous 185mm[SUP]2[/SUP] 3c Al PILC-SWA parallel feeds to the MCC panels. I asked the designer why the cable was derated and was told it was central engineering policy. Considering they didn’t use the IEE CCC tables but up rated cables and issued their own standards I found it strange they would downrate anything!
 
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