Thread: Plug-in circuit breakers

Hi All,
I'm new to this forum. I've got an electronics background, but I'm not a licensed sparkie.. I bought a house a few years ago that didn't have a shed. Now I've built a shed and need to get an electrician to wire it up for me. The cable distance is just under 40m.

Looking at my house power board, I've got three phases coming in. Each passes through a 60Amp fuse before going to the meter. Then through a 3 way switch labelled 36A. From there the three phases are split across power, light, off-peak hot water and stove. There is a three phase RCD installed, but only in a single phase mode on the power circuits. All the fuses are ceramic old style with wire. I'm wondering about doing the following:
a. Have the ceramic fuses replaced with modern CB's or replace them with "plug-in CB's". You can get them in various sizes.
b. Do a full three phase run to the shed power board, or do a single phase run to the shed power board using a three phase cable (that would allow me to expand to three phases without having to redraw the cable if I ever need).
The RCD that is installed is a Clipsal 4EL40/4/30 old style. It was installed in June 2003. I'm wondering if I can have the light circuits connected up via it as well. Or would I be better of replacing it completely and have a new one installed for all three phases before they split out.

Any thoughts or advise..
Viking