- Reaction score
- 1,169
Okay fair enough, I think we are singing from the same hymn sheet here, when designing a sub-main we go through the assessing compliance bit when we are selecting our cables, and no I wouldn't try to make up the csa as a mix.
I was taught that where PME conditions apply that we allow for the worst case, and the CPC should be calculated separate from the MPB, so if the armourings would have been marginal for the MPB (just complying), then either use an extra core for the CPC or if large enough csa the core as the MPB, and use the armourings for the CPC.
I will have to look in the 16th ed and see if there was an actual reg for this, or if my then old boss was just belts and braces.
I was taught that where PME conditions apply that we allow for the worst case, and the CPC should be calculated separate from the MPB, so if the armourings would have been marginal for the MPB (just complying), then either use an extra core for the CPC or if large enough csa the core as the MPB, and use the armourings for the CPC.
I will have to look in the 16th ed and see if there was an actual reg for this, or if my then old boss was just belts and braces.