![]() ![]() ![]() The simplest explaination of the wiring method this code refers to is where you have two 3-wire cables terminating in a box - 1 feeding in and 1 feeding out to the next box. The other part of that is, if you can't fold 4 or 5 wires each 6 or more inches long connected to a duplex receptacle neatly into a normal size wallcase, you probably shouldn't be doing this kind work. One connection is always better than two, and a wirenut connection is no better than the dual screw connections on a duplex receptacle (never put 2 hooked wires under one screw though). Otherwise, because it violates common sense (and cost more in T&M), pigtailing is not recommended. You'll probably never see this kind of wiring in a home, but if you have 2 or 3 circuits sharing a neutral in the same cable or raceway supplying several fixtures and/or devices, they want you to pigtail the neutrals (and only the neutrals!) at each device or fixture connection. That means where 2 or 3 circuits with 1 shared neutral wire are passing through a box. The paragraph's 1st sentence starts out, "In multiwire branch circuits,". Visit our ELECTRICAL page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.Mike quotes the code (300.13B Device Removal) but misunderstands what it means. What is the code requirement for receptacle outlets in a closet?.How dangerous is old electrical wiring?.What is the life expectancy of electrical wiring in a house?.What are the most common electrical defects found in a home inspection?.Can old electrical wiring go bad inside a wall?.How can I find out the size of the electric service to a house?.Why are old electrical components not always "grandfathered" as acceptable by home inspectors?.What causes flickering or blinking lights in a house?.Why is undersize electric wiring in a house dangerous?.What is the color code for NM cable (Romex®) sheathing?.What are the requirements for NM-cables entering an electric panel box?.What is the minimum clearance of overhead electric service drop wires above a house roof?.Does a wire nut connection need to be wrapped with electrical tape?.Why is a strain relief clamp necessary for the cord connection to some electric appliances?.Should I get a lightning rod system to protect my house?.Why is it unsafe to bond neutral and ground wiring at subpanels?.What are typical aluminum service entrance wire/cable sizes for the electrical service to a house?.What causes copper wires to turn green or black in an electric panel?.Is it alright to just put wire nuts on the end of unused or abandoned NM-cable or wiring?.What is the maximum spacing requirement for securing NM-cable (nonmetallic-sheathed cable)?.Can a short circuit cause a high electric bill?.Which house appliances need a dedicated electrical circuit?.Here’s links to a collection of our other blog posts about ELECTRICAL WIRING: Tape is also not a substitute for a wire nut, as in the photo below, and splices should not be in the open. Taping might make sense if the insulation on the wires was stripped back too far before twisting them into the wire nut, to cover the bare wire, but it would be better to trim the insulation correctly before insertion into the wire nut. Taped-up wire nuts are an indication of homeowner or handyman wiring work, since professional electricians don’t do it. ![]() They are called wire nuts in the electrical trade, but the official name is “twist-on wire connector.” Wire connections were soldered together before they were invented and needed to be wrapped with tape to insulate the connection, but that era is long gone. ![]()
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