What (standard? definition?)would you use to calculate these cables?

[fgf]

[himmelstern]

Use Cymcap Software



or even etap software

[user82]

Good question* I would make guess* cable inside conduit in 'air'.

If cable surround by dirt/clay when buried* harder for temperature to dissipate. In tunnel* air still flow and can cool cable temperature.

For this calculation I would apply ambient temperature derating factor as underground tunnel temperature higher I guess than normal 'air' and cable proximity derating factor.

Cable size guide standards to use-> BS7671 or IEC

[fgf]

Thank you for understanding and answering this question

[user82]

Welcome.

[himmelstern]

those are cables in trenches. look for a standard for this calculation with this term












IEEE Recommended Practice for Cable Installation in Generating Stations and Industrial Facilities
IEEE Std 1185-2010 (Revision of IEEE Std 1185-1994)

or ie:

[link Point to another website Only the registered members can access]

[fgf]

Thanks!

As for the simulation*
Those of us with CYMCAP 4.2 don't have the "cables in trenches" option

we came up with a solution (sort of )* use raceway and set the RHO of the raceway to 0