IPS Aluminium Tubing OS Substations

Not without looking on Google, which is what I suggest you do.

Or contact the equipment manufactures, they will help if you're actually buying the equipment.

Connections from tubular bus to electrical apparatus are usually made with cable jumpers to account for expansion and contraction of the tube's length due to heating and cooling. Occasionally they are made with expansion connectors (if it's an in-line connection), and some connections can be made with a solid (no flex or expansion) connector if there is flexibility in the apparatus. Take a look at the site for DMC Power, which makes one variety of connectors for tubular bus. Theirs are mechanically swaged onto the tubing, but it is also possible to use bolt-on compression connectors or welded connectors. There are some good examples in their photo gallery.

http://www.dmcpower.com/connectors/substation-bus.html

http://www.dmcpower.com/resources/photos.html

An overall good reference for substaiton design is the free download "Design Guide for Rural Substations," available here:

http://www.usda.gov/rus/electric/pubs/1724e300/1724e300.pdf