CCC of 1.5 T & E

[securespark]

Could someone look in their 16th Brown & tell me what the CCC is of 1.5 T & E Method 1, please?

For reasons I will not elaborate on (!), I cannot get mine out of the van!

 

[Adam_151]

20A in my book (OSG) for clipped direct

Sounds a bit high when you say it quickly lol (but I suppose thats becuase clipped direct doesn't occur in houses too often)

15.5 for one and 27 for two and a half for what its worth, four is 37 and six is 47 and a whole 65 on ten

 

[securespark]

Cheers, Adam! Thanks very much!

Mods. Can you delete this now? I only wanted an answer to this question.
______________________
Lynda, moderator

seems you got more than you asked for.

If you still want it removed email me

 

[HDRW]

20A in my book (OSG) for clipped direct

Sounds a bit high when you say it quickly lol (but I suppose thats becuase clipped direct doesn't occur in houses too often)

15.5 for one and 27 for two and a half for what its worth, four is 37 and six is 47 and a whole 65 on ten

I've never really thought about it before, but seeing it written out like that shows clearly that as the cable gets bigger, the allowed current density in the conductor gets smaller - at 10mm it's less than half that at 1mm (6.5 and 15.5 Amps/sqmm respectively). I suppose it must be the problem of heat dissipation, because it can't be the resistance!

Cheers,

Howard

 

[Maxxy]

20A in my book (OSG) for clipped direct

Sounds a bit high when you say it quickly lol (but I suppose thats becuase clipped direct doesn't occur in houses too often)

15.5 for one and 27 for two and a half for what its worth, four is 37 and six is 47 and a whole 65 on ten

I've never really thought about it before, but seeing it written out like that shows clearly that as the cable gets bigger, the allowed current density in the conductor gets smaller - at 10mm it's less than half that at 1mm (6.5 and 15.5 Amps/sqmm respectively). I suppose it must be the problem of heat dissipation, because it can't be the resistance!

Cheers,

Howard

The strands get bigger too though dont they? So smaller surface area. I know its the voltage that goes round the outside of a cable..but maybe it still has an effect?

 

[plugwash]

skin affect is negligable at 50hz on domestic sized cables (it *is* an issue on some big distribution cables though)

its because CSA goes up proportional to r² but the circumfrance (which is equivilent to the surface area of the cable as a whole per unit length, surfaces of strands that touch each other don't count) goes up proportional to r.

and its the circumfrance (as well as the insulation and what the cable is burried in) that sets current carrying capacity.

this is why on the really big overhead powerlines you see conductors in groups, each conductor can cool seperately but there is still only one insulator needed to hang the whole group.

 

[Pensdown]

For reasons I will not elaborate on (!), I cannot get mine out of the van!

OK, I'll go first.

Have you forgotten where you parked your van in a multi storey?

 

[RF Lighting]

Locked your keys in the back of the van?

All our vans are fitted with slam locks on the back doors, and keys often get locked in there.

 

[Softus]

Towed and stowed?

 

[HDRW]

Someone's put their Rotweiler in the back and it won't let you in?

Cheers,

Howard