220 in sequence

Gary-

Your "buddy" will hold you libel for causing the fire!

I think the 220 would normally be run in sequence, but that depends on the wire gauge and how much current the heaters require. In an extreme case, you might need to install a separate breaker for each.

Fred

Have you done home electrical wiring before?

it's good to start on someone else's home, so when you get to yours you may know how to not burn it down.

You have not provided enough information.

1. what is the current or wattage of each heater
2. how many heaters
3. what size breaker do you have
4. what size wire are you using
5. do you know anything about electrical wireing ? Most likely you will not be using a neutral in a 220 (240 ) volt US electrical heater system.

You just need a circuit with conductors and breaker appropriate for the total load. Since it's considered a fixed load, that would be 125% or more than the actual load. Whether it makes sense, is practical to put it all on one circuit or use more than one then depends on what the actual loads are, how many, where they are in relation to the panel, etc. Please don't take this the wrong way, but if you have to ask this, you may want to reconsider doing it, especially for someone else. Also, if it's the US, it's 240V.

Good point on no neutral. I missed that.

The only wire you can share is the ground. (same size as the ungrounded conductors). Typical wall packs are 2300w @ 240v so that would require a 15a circuit for one. If you are stringing them both out on a single circuit you will be wiring for 30a, 10ga copper. It computes to 19.1a but you have to count the largest single load at

Not sure what that means. If you put two heaters on one circuit, you are sharing all the conductors.

Typical wall packs are 2300w @ 240v so that

You're over your head dude. Hire an electrician!

"Do I need to run a separate 220 for each heater & if so can I share any wires whether it’s the ground or neutral?"

You only have to supply one Equipment Grounding Conductor, sized to the largest overcurrent device in the group. You can't share any current carrying conductors on separate circuits tho.

Depends on wattage of the heaters and capacity of the circuit - so the answer is either "yes if" or "no but"

I'd say if you don't know the answer you should NOT be doing it for someone else.

OK, I see. What defines a group then? In the same conduit? Anything else? For a porch I figure he'd use Romex, so if he has two circuits he gets two ground wires anyway.

It can really be anything but for your usual residential setting, you are right, the cable wiring methods come with their own ground. It usually comes up when you are using plastic conduit or tube. Carlon was trying very hard to get Smurf tube (ENT) into residential installations 25 years ago but they ended up settling for a more limited market. The only place I see it here is when they are pouring concrete around it. That is what I did in my addition too. The boxes are in poured cells, fed with 3/4" smurf. There is no drywall out there. The normal installation is the light over a garage door or coach lights on the sides, poured in the tie beam and doweled cells on both sides of the door.