Get something to insulate and cover your hands and feet. A rubber glove is good, and so is putting on boots to avoid the risk of grounding. I highly recommend using insulated floor mats as well.
Wiring a dual-function CB is almost the same as installing a typical circuit breaker. Their only difference is that there are three wires coming from the dual-function breaker itself. Then, shut down the main power line that feeds your load center. What we need to achieve here is the assurance that panel surfaces are safe to touch.
Use your multimeter or voltage tester to test the screw points on your panel cover before you make contact with your screwdriver. Set your multimeter to voltage reading and press its probes down to the mentioned areas. Now that you have clearance, remove your old breaker the one that needs replacement by carefully pulling it outward from the seat of the hot bus bar blades.
Unscrew the wirings connected to the old breaker once it is out. Identify which circuit will go into your breaker before an AFCI breaker installation. There are two wires: one, the white neutral wire that goes into the Neutral screw indicated on your breaker, and two, the black wire or the hot wire, which goes to the hot screw of the breaker.
Ensure that the breaker is off before inserting these wires into their respective areas. Screw them shut. With the circuits connected, slide your breaker into its appropriate tab. Be careful not to bend the hot bus bar when interlocking the base of your breaker to the mounting rail.
Besides, you need to keep few things in mind before installing your new breaker. Ensure that you have tools such as screwdrivers, non-contact voltage testers and pliers. Next, follow these steps to successfully install your GFCI or ground fault breaker. Ground circuit breakers are necessary as without them the risk of electrical fires and shocks increase manifolds.
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And in some areas, local codes do not allow unlicensed homeowners to do this work. Call a licensed electrician if your code requires it, or if you're not completely confident in your abilities. This is a basic, affordable service call that should take the electrician less than an hour to complete. It presumes that the circuit cable has already been routed into the panel and is simply awaiting connection to a new circuit breaker.
Open the service panel door and switch the main breaker to the OFF position. Remove the panel cover called the "dead front cover" without touching any wires inside the panel. Confirm that the power is off inside the panel, using a non-contact voltage tester to check several wires and circuit breakers.
Check both terminals on a double-pole breaker, making sure that the breaker is switched ON. The tester should indicate zero voltage for all tests. Remember: Switching off the main breaker turns off the power to the panel's hot bus bars and to all of the branch circuits. It does not turn off the power to the utility service conductors coming in from the utility meter or the terminal lugs they connect to in the panel.
Utility service wires and the main breaker terminals remain live and carry deadly current even when the main breaker is switched off. Never touch the main breaker terminals or the service wires. Remove one of the knockout plates on the panel cover, if necessary, to create an opening for the new breaker, using pliers. Switch the new breaker to the OFF position. Connect the breaker's coiled white neutral wire to the neutral bus bar on the service panel.
You must use an open screw terminal on the bus bar; do not connect more than one wire to a single terminal. Make sure all of the wire connections are tight. Snap the breaker into the panel as directed by the manufacturer. Most breakers have a notch or foot on the outer end of the breaker that fits into a mounting rail on the outer side of the breaker area in the service panel.
The inner end of the breaker snaps into a tab or clip on the panel's hot bus bar. Reinstall the panel cover and door, as applicable. Turn off all of the branch circuit breakers.
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