Garage Wiring Problem
I am planning on installing a flourescent light in my detached garage as well as a lightswitch to control a patio spot. When I inspected the wiring I noticed several things that I think may be problems, and I would like some advice before I proceed.
There are 2 circuits in the garage. Both come into the garage via an underground conduit (run under concrete walkway) through UF-B 14/2 cable.
One circuit is wired with a mix of NM 12/2 and NM 14/2. (I know this is not ideal, but it's already there) This circuit contains 6 receptacles (all 15A) and a light bulb socket. It connects to a 20A breaker. How much of a problem is this set up? Do I need to replace the breaker with a 15A, or the NM12 with NM14? As far as I can tell the circuit has existed like this for the last 20 years (I've only owned the house for 4 yrs). Oh, don't know if this is impt, but the service coming into the house was upgraded from 110 to 220, years before I bought the house.
The other garage circuit contains a spotlight, a patio light and 6 highhats in the house. As far as I can tell it is all wired with NM14/2 and goes to a 15A breaker. This is the circuit that I would like to add a flourescent light to, and also add a switch that controls the patio light -- I'll be doing this in the garage with NM14/2. I think this circuit is fine, but is there anything I should know, before I begin this part of the project?
Any advice would be much appreciated. Thanks