reference methods

[snipes]

hello all

i have a cable coming from fuse board in wall for 0.5 meters ,under the floor boards, up a riser then clipped above insulation in loft , i would class this as "clipped direct" . what do other people think ? right or wrong ?

thanks in advance for replys

 

[telectrix]

worst as regards temperature correction is buried in wall. take that as you reference method when calculating cable ccc.

 

[snipes]

6mm cable clipped direct is 47amp in 17th. customer wanting a 9kw shower replacement 39 amp installed as above, would you leave or upgrade ?

 

[telectrix]

i would leave itat 6mm.. try a clamp meter with the shower running on hottest. bet it's less than 39A. iv'e seen 10.5kW showers drawing 36A max. manufacturers ratings are a bit optimistic.

 

[snipes]

ok thanks for the quick reply , just need to convay this to council tomorrow, would be a nightmare to replace cable , nice to get some back up