Cable selection
Cable selection
(OP)
Hi,
I am wondering if anyone can give me advice on when to use double netural cables for building services: eg...data centres (with harmonics) is the only one I am thinking about.
To take it to the next step...what is the deciding factor of using double netural cable and how you can calculate it?
Thanks
I am wondering if anyone can give me advice on when to use double netural cables for building services: eg...data centres (with harmonics) is the only one I am thinking about.
To take it to the next step...what is the deciding factor of using double netural cable and how you can calculate it?
Thanks






RE: Cable selection
Depending on the type of facility it may or may not make sense to use 200% rated neutrals, it really depends on the types and quantities of loads you have.
RE: Cable selection
Then look at the combined neutral current of the loads that may generate harmonics.
Multiply the harmonic suseptible current by 2. If the total current is over the rating of the phase conductors then go to 200% neutrals.
This is a conservative estimate.
respectfully
RE: Cable selection
e.g 5 *1C 185mm^2 + E (XLPE/PVC) CU cable or
e.g 3 *1C + 2N 185mm^2 ...etc
RE: Cable selection