Updating old wiring

Tools A drill or screwdriver Flat head bit Phillips head bit An extended Phillips head bit Outlet tester Grounding wire, if needed Needle nose pliers with rubber or non-metal grip New wall outlet -- a standard three prong if you're building is grounded or a GFCI (Ground Fault Circuit Interrupter) if it's not 1.

First and foremost, turn off electricity to the circuit you're working on.

To start, how can I say that a properly installed fuse is as safe as a circuit breaker?

A fuse will only handle the amount of amperage that it is rated for.

It's rare to find two-prong outlets in homes these days.

Landlords and home owners have slowly switched over to three-prong outlets as more and more devices and appliances need them to power up.

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.

Some have loads connected through snap switches installed in the neutral conductor. The result: a differential neutral current that immediately nuisance trips the GFCI. Suppose you’ve correctly associated a line-side neutral with its line-side ungrounded counterpart.

Circuit breakers are designed to trip when too much current passes through for too long a period of time. A typical 60 amp fuse box might have one 240 volt circuit for an air conditioner or electric range, plus four more fuses for the rest of the wiring in the home.

Circuit breakers can be reset after they trip, which is a huge advantage over fuses, but they don’t add any level of safety. Compared to the minimum number of circuits required today, this is totally insufficient.

The technology involves using a much greater range of frequencies on copper cables.

Because copper is very prone to interference, or “cross talk,” between nearby lines, this is continuously measured—and a noise-canceling signal is generated to counteract it.