On the X-10 question... X-10 signals don't jump phases well, so you positively MUST include an amplifier/repeater like the Leviton # HCA02-10E on this job, otherwise you're gonna be dealing with call backs:

[Linked Image from leviton.com]

You usually can mount the amplifer in a standard gang (3 or 4) box with cover. The amplifier is shoud have it's own DEDIDICATED breaker on each phase (double pole). The HO might even be surprised how well the X-10 works when you're done!

Don't waste you're time with bridges/couplers, like the Leviton # 6299 -- a waste of time.

I found that on a lot of those old Zinco systems, they simply moved the bar on the back of the breakers to keep everything X-10 on one phase to keep the X-10 devices happy... so much for balancing loads.

It's also a good idea to include a whole house blocking coupler, Leviton # 6284 to prevent neighbors X-10 signals from interfering with your customers devices:

[Linked Image from cache.smarthome.com]

As you can see, it slips right over the neutral line, so a service upgrade is an opportune time to install it.

And my opinion is to run seperate neutrals directly to the panel, this way you don't run into problems with GFCI and AFCI breakers should they be installed in the future.

Joe

[This message has been edited by JJM (edited 08-02-2006).]