My first thought is that this was a type of multiwire branch circuit but it doesn't seem to fit with what I've read on those either. I'm familiar with running 12/2 and 14/2 to outlets and thought I had a basic understanding of typical wiring but what I've encountered here has me confused and intrigued. There are no wires connected to the load side of any of the plugs. The hots and neutrals are pigtailed together, then connect to the lines on the receptacle. There are 3 other receptacles currently in this room as well, they are all wired as follows: They each have two separate runs of older NMD-3 12/2 wire that come down from the ceiling (currently hidden by drywall) and run parallel down stud bay into each outlet box. This receptacle was used for a washing machine when the wiring was upgraded, and this is the only reason I can think of why maybe a separate hot wire was reserved for use here? The white neutrals are pigtailed together, and then feed into the appropriate line on the receptacle. The red hot wire from the 14/3 is connected directly to the receptacle line, and the black is pigtailed together with black from the 14/2 wire and doesn't connect to this receptacle at all. The 14/3 from the panel ends at the first receptacle in the room, where it runs into the outlet box along with 14/2 wire from a light switch. The panel was upgraded within the last 30 years or so by a professional electrician and there is modern wire running from all breakers. At the panel, a double pole 15 amp breaker with 14/3 wire is clearly labeled and dedicated to the room in question. I had originally planned on adding an outlet from one of the existing receptacles as part of the renovations. I'm in Canada and renovating what used to be the laundry room in my older house. So 14/3 UF cable would have 4 wires.I would appreciate any help or guidance. A 14/3 cord counts the ground, cables like NM or UF don't count the ground even though present. **Just for clarity, nomenclature for cords (like appliance and extension cords) and cables (NM, MC, UF) are different as used by the NEC. If using THWN conductors #14 is good for 16A (using 310.16 75☌ rating since 240.3 exempts A/C from 15A limit of 240.4).Īdditionally the installation instructions may specify minimum size wire, the instructions are part of the UL/ETL/CSA Listing, and the NEC gives higher priority to the Listing than the general provisions in the Code. I'm assuming your talking about UF since NM (Romex) can't enter a damp or wet location. So if using 60☌ UF cable 14/3 is only good for MCA of 12A. The wire needs to be rated for 125% of that number. So it depends on your system requirements if XX/2 or XX/3 is needed**.Īs to size the unit should the unit should have a label that specifies two separate numbers, "Maximum Overcurrent Protection" that specifies breaker size, and "Minimum Circuit Ampacity" which applies to wire size. Some ductless minisplits do have some 120v control or condensate pump options that do require the neutral. Most traditional split systems that use the heating ductwork don't need the neutral.
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