Do an "electrical inventory," creating a list of all the devices you’ll be using in the house, and where.Your electrical system needs to match your needs; figuring out where and how you’ll be using power makes it easier to frame the parameters of the job.2. Codes set standards for everything from how many outlets you’ll put in each room to what kind of wire you’ll be using.Since the grounding terminals for the receptacles are not grounded, you must mark the receptacles with the words “GFCI Protected” and “No Equipment Ground” (see Sidebar: Understanding GFCIs). A GFCI-protected grounding-type receptacle without an equipment-grounding conductor is safer than a grounding-type receptacle with an equipment-grounding conductor, but without GFCI protection.This is because the GFCI protection device will clear a ground-fault when the fault current is 5m A ( or - 1m A), which is less than the current level necessary to cause serious electric shock or electrocution.Old houses often need updates to electrical systems; the author’s 1903 home was no exception.Follow these tips to get it done without causing undue—or irreparable—damage to your building.This minimizes the risk of electric shock, and allows surge protectors to protect your electrical equipment, such as televisions, computers, stereos, and other devices.The best way to upgrade a two-prong outlet is to install a three-prong outlet that has a continuous electrical path back to the panel.
People tend to replace 2 wire ungrounded outlets with ungrounded type outlets in order to establish a more convenient outlet for their three prong appliances.
Two-prong outlets can always be changed to three-prong, and this can be accomplished a few different ways.
Today I’ll give a brief explanation of what the third prong is for, and I’ll discuss a few ways to convert to a three prong outlet.
The NEC requires you to install grounding-type receptacles on 15A and 20A branch circuits. 210-7, it also requires you to effectively ground the grounding contacts of those receptacles to the branch circuit equipment-grounding conductor.
But, what can you do about old 2-wire nongrounding-type receptacles, where no ground exists in the outlet box? 210-7(d)(3) permits any of the following installations when replacing a 2-wire ungrounded receptacle: (a) Replace it with another 2-wire receptacle; (b) Replace it with a GFCI-type receptacle and mark the receptacle with the words “No Equipment Ground;” or (c) Replace it with a grounding-type receptacle protected by a GFCI device (circuit breaker or receptacle).