mf ceiling grids and wiring

[davelerave]

anyone got advice on domestic installations where the grid is already in place
(usually we're in before the grid)
regarding cable runs and cable support

-handiest install methods?


-because of the price of copper it's not practical to bunch cables in main runs


-is EMI a big issue with network cables if they're draped on the grid?

thanks

 

[pennywise]

PVC coated builders band in loops keeps everything off the ceiling nicely.

All Round PVC Coated Fixing Band at PEW Electrical

 

[bugsy]

All the cables should be supported , cable band, cable ties , lops of twin skin, but keep them off the grid, ( Im assuming it hasent been boarded ! )

 

[davelerave]

usually we do chalk lines for mains and data 'main runs' before grid goes in


and fix the clam type swa glands to underside of hollowcore

that method of wiring is too expensive now -as the cable runs are longer than necessary


'the ceiling grid is neither exposed nor extraneous in normal circumstances so shouldn't be earthed or bonded'-is my understanding


always was concerned about the ceiling grid inadvertently becoming live -what do you guys think?

 

[davelerave]

PVC coated builders band in loops keeps everything off the ceiling nicely.

All Round PVC Coated Fixing Band at PEW Electrical

does anybody earth or bond these ceilings

 

[bugsy]

If you were to properly bond a ceiling grid you'd spend more on that than the installation!

 

[davelerave]

If you were to properly bond a ceiling grid you'd spend more on that than the installation!

true-so don't do anything with the grid then


as it's neither exposed nor extraneous

some guys seem to routinely earth them as a precaution

 

[malcolmsanford]

If it's not an exposed or extraneous conductive part, then by bonding it could potentially make the grid LIVE during a fault, so routine bonding becasue it's metal is not advised really.

 

[Engineer54]

Always test first, don't assume anything when it comes to ''commercial grid ceiling installations''. During the installation of these grid hangers, it is more than possible to make contact with the slab re-bar, thus making the ceiling grid an extraneous conductive part. Had that happen on projects on more than just a few occasions!!!

 

[KINKY]

you can fix your caballing to the T bar using T bar fixings

T Bar Angle Bracket Cable Tie | Buy T Bar Angle Bracket Cable Tie Online

 

[davelerave]

these are concealed domestic ceiling grids


the commercial T bar grids are different afaik

you couldn't effectively bond the commercial grids i would think because of poor continuity

 

[Strickers]

ty-raps and ty-rap bases. Always worked best for me. If there is slab above hilti also produce some products which are quick and easy to use.

 

[davelerave]

im going with the clam type swa cleats and a few chalk lines

PVC/SWA Cable Cleats | City Electrical Factors

ive a selection of 6,8 10 and 12

if i can get a chalk line over the grid-theres a decent drop anyhow from hollowcore