Hi folks  

As above really, I have to box in a steel beam, the spec says:

'All beams ... covered with 2 no. sheets of 12mm plasterboard wired at 100mm centres'

I've come across this phrasing several times while searching Google, but can't find any pic or description. Do I have to drill the beam??

I asked the builder I got to put the beam in, he wasn't sure and said he'd fix to noggins knocked between the beam flanges. I believe the 2 sheets of plasterboard and wiring are for fire regs, so using wooden noggins seems counter-productive.

So how do I wire it?

I believe that when boxing in steels now, the timber must be "mechanically" fixed to the steel, you can't just wedge noggins in the flange any longer