Trunking and conduit grouping factors Cg

[nobelz66]

Hi does someone know where to find the grouping factor Cg for cables enclosed in trunking and conduit please also where to find reff method for cbles paced directly into a plastered wall many thanks

 

[Sintra]

First place I would look would be the on site guide.

 

[telectrix]

don't think there's any ref. to cables plastered in walls that aren't thermally insulated. generally go with method C.

 

[Pete999]

OSG, BS 7671 at a guess

 

[nobelz66]

First place I would look would be the on site guide.

Thanks for your reply I have looked in the onsite guide also BS 7671/2011 but no reff tables that I i can see

 

[Gktssm]

OSG Appendix F

 

[Richard Burns]

Grouping factors are for the number of loaded circuits placed close together and are additional to the installation method factors.
So installation method for cables in conduit and trunking has a specific current carrying capacity and then the grouping factor for the number of circuits is also applied.
As Tel says cable buried direct in plaster is reference method C.

 

[Amp David]

Thanks for your reply I have looked in the onsite guide also BS 7671/2011 but no reff tables that I i can see

You must have one of those fake books with pages mising