Sleeve installation for electrical penetrations

[dahualin]

I am reading 2006 version masterspec section 16051. It says "install sleeves for penetrations on concrete slab and walls unless core-drilled holes or formed opening are used. Install sleeves during erection of slabs and walls".
I am wondering do we need install sleeves for electrical service conduits under service panelboard or switchboard? I have never seen that before. What do you think? Thanks.

 

[ron]

The sleeve install during erection means that it doesn't have to be cored later.
A sleeve may also be needed before or after depending on the listed assembly for fire stopping that is used (if fire rated).