Transportable homes

[ElectricalApprentice]

After reading 3001, am I right in thinking that an a transportable office can be wired using 7 strand 1.5mm tps, with a single circuit feeding all lighting and power points protected by a single 16A RCBO which is also the main switch?

[AlecK]

Yes.
The essential points are
- multi-stranded conductors to cope with flexing / vibration during transport
- current limitation to protect the incoming supply lead & associated fittings
- RCD protection for all final subcircuits.

There's currently no specific requirement for a single means of isolation controlling the entire connectable installation;
and if there were it wouldn't be a "main switch".
More like the (optional) isolating switch on incoming supply to a DB.