Busduct

Each bus duct mfr will have their floor / wall penetrantion systems only listed for fire ratings using a specific Fire Stop seal material, so it's crucial that you read and follow their instructions. A lot of people get burned by that (no pun intended).

I've got to ask, are you qualified to undertake this sort of work?

To ask the question it wouldn't seem so.

We all encounter first time problems to surmount.

OP did the right thing and asked. This will set him/her on the right track.

OP, as previously recommended talk to your busduct supplier to get their complete penetration solution.

OP will learn that vendors are an excellent source of free consultation and will put their nads on the line for a sale. Just get it all in writing.

Dear threaders, I have posed the question to suppliers and am awaiting their reply. It seems to me (for the replies sent) that I did not set forth my question in a clear manner. The problem is not in the firestop (that is solved already); the problem is in the heating of the metal bar (current carrying) inside the busduct, that will transmit the heat from a fire up and "might" ignite something in the above floors if there's the threat. As you all know heat is one of the legs of the fire triangle.

Regards

You may try fire resistant busducts of compact and sandwitch design where fire stops are not needed. These are housed within a galvanised steel housing or extruded aluminium housing with epoxy compound powder coating.

Most fire stop materials supplier have their fire stop design for busduct through penetration.

e.g. 3M and Hilti.

The fire stop design is not dependent of busduct manufacturer. You can use the design as long as the busduct is correct type and size.

Actually, there is no such fire resistant busduct in the world as there is no such recognized standard for busduct. Some manufacturers used some fire resistant tests for cable to cheat consultants and their customers. But the tests are actually not applicable to busduct, otherwises, you will find IEC issued related standard or test requirement.

Don't understand your question....what do you mean by isolating the bus duct x floors with a switch?

Thanks for replying. I think the question was answered clearly by WFMFIRE, heat will be transmitted also by steel water piping, HVAC ducts and other. So what remains to be done is to firestop all between floors penetrations.

Regards