Grounding of an old house
If you are replacing the wiring (after a fire, I guess you mean by "partially burned"), I believe the normal standard is to meet the current codes at the time of replacement, not the code at the time of the building construction.

As such, you will need 4-wire service (hot, hot, neutral, ground) to 240V appliances that use the neutral. 240V appliances that don't use the neutral only need hot, hot, and ground. 

You will also need to bring the grounding system up to current applicable code.

My sense from your question is that you might want to self-educate a bit more, or consult with an electrician in the planning stages, rather than have to re-do stuff later from improper planning now.