7,300 Watts supplied on a 2.5mm2 T&E.

AJJewsbury: 
 

Zoomup: 
 

Perhaps the pointed headed men in white coats at the I.E.T. could consider a Cfut correction factor. We already have Ca, Cc, Cd, Cf, Cg, Ci, Cs to name but a few.

Cfut cold refer to the functional utilisation time conditions. So, if applied, it would allow a large load to be supplied by an otherwise inadequately sized cable, but only for a short period of time, before the cable becomes dangerously hot and starts smoking. This approach will save materials and money.

 

Z.

No need - the concept is already in BS 7671 - see 533.2.1 3rd paragraph (although done by adjusting the design current rather than by a correction factor).

   - Andy.

533.2.1 3rd paragraph is concerned with choosing the values of In and I2 surely. I was concerned with the duty cycle of a cable. Say it is overloaded by 30 percent for short periods, say 10 percent of its operational time, would it really suffer?

Z.

AJJewsbury: 
 

Zoomup: 
 

Perhaps the pointed headed men in white coats at the I.E.T. could consider a Cfut correction factor. We already have Ca, Cc, Cd, Cf, Cg, Ci, Cs to name but a few.

Cfut cold refer to the functional utilisation time conditions. So, if applied, it would allow a large load to be supplied by an otherwise inadequately sized cable, but only for a short period of time, before the cable becomes dangerously hot and starts smoking. This approach will save materials and money.

 

Z.

No need - the concept is already in BS 7671 - see 533.2.1 3rd paragraph (although done by adjusting the design current rather than by a correction factor).

   - Andy.

533.2.1 3rd paragraph is concerned with choosing the values of In and I2 surely. I was concerned with the duty cycle of a cable. Say it is overloaded by 30 percent for short periods, say 10 percent of its operational time, would it really suffer?

Z.