OP
Engineer54
Re: 95 mm 4 core cable, 30 m run, in ducting under buildings backed up by 200 amp fus
I don't take the ****!!
Oh i forgot, none of this applies to a ring circuit does it!! It somehow doesn't need to have the same heat dissipation requirements of a similar circuit!!
Whatever you guy's want to do when running parallel circuits is up to you lot!! You'll be, all but defeating to whole point of a parallel circuit!!
I know that i'll wont be adding a grouping factor to any parallel single circuits i'll be seeing on this project!! And i'll be happily sleeping like a baby to the end of my days, in that knowledge!! lol!!!
Come on Eng54, you have to be taking the ---- now....
Ok, just look in the regs at correction factors for cables... they are all about heat dissipation of the cables.. Ambient temp, thermal insulation, buried in the ground.....
Look at the tables for the current capacity of cable eg. Table 4E4A the more surface area of the cable is in contact with the air the higher the current is.. Also heat dissipation...
Therefore two cables touching will not dissipate the same heat as two cables apart. Therefore you have to de-rate the cable. Again, single circuit or multi-circuits its all the same. The physics of it cant distinguish between 2 cables supplying 100A each for one circuit and 2 cables supplying 100A for 2 circuits. They are both producing the same heat....
I don't take the ****!!
Oh i forgot, none of this applies to a ring circuit does it!! It somehow doesn't need to have the same heat dissipation requirements of a similar circuit!!
Whatever you guy's want to do when running parallel circuits is up to you lot!! You'll be, all but defeating to whole point of a parallel circuit!!
I know that i'll wont be adding a grouping factor to any parallel single circuits i'll be seeing on this project!! And i'll be happily sleeping like a baby to the end of my days, in that knowledge!! lol!!!