Archive for March, 2012

Ground Fault Circuit Interrupters (GFCI) have been part of the NEC code for over 40 years now and just like your car, things have changed. Over the years the code has changed but also makers of GFCI and Underwriters Laboratories (UL) have made a lot of good changes. Life saving changes that probably nobody except a few electricians have noticed. Today, most people just think of the GFCI in their bathroom or kitchen and will probably never know all the great GFCI that are available.

Today, the standard GFCI that you see in your wall is either 15 or 20 amp and the most noticeable feature you see is a light, usually a little green light. If you don’t see the light or the light has changed colors then your GFCI will not work. What you don’t see is that GFCI are self testing every 15 minutes. A trip can be reset, but a failed GFCI will not reset and you will have to replace the GFCI. Another feature is that the GFCI comes from the factory in the tripped position and if it is mis-wired you will not be able to reset the GFCI until it is corrected.

Did you know there are tamper resistant receptacles and GFCI? Now manufacturers make tamper resistant GFCI for your children’s bathroom. These meet the same stringent requirements of a standard GFCI, but now somebody cannot just stick something conductive into any slot of the GFCI. Now you can sleep better at night knowing your kids are safer. The tamper-resistant receptacles and GFCI have been NEC code since 2008 but not all municipalities are enforcing it yet.

Now you can buy weather resistant GFCI. It will still have to go in a weather resistant cover or even a bubble cover. Weather-resistant GFCI are made to go outside, being able to take extreme temperatures, UV and moisture. The weather resistant GFCI are also made with the tamper resistant feature.

Faceless GFCI are also made. This is just GFCI made with only the test and reset buttons, no receptacle built in, like it’s name implies.

Another faceless GFCI is the high current GFCI which can handle up to 80 amps at 240 volts. These feature a current sense transformer called a donut which is powered by 120 volts. If you need a GFCI for your spa or equipment and cannot find a breaker, then these will come in handy. The high current GFCI should only be installed by a licensed electrician.

Do you need a night light or a guide light? GFCI are made with a receptacle and a light. A photo sensor turns the light on and off. How about a pilot light with your GFCI? The light comes on when there is a load on the GFCI. Comes in handy in basements with sump pumps. All the lights are LED for low power consumption and long life.  Do you need a switch and the only room is a GFCI? Replace the GFCI with a combination switch and GFCI. The switch is independent of the GFCI and can turn on that vent or light. These combination devices can also be purchased with the tamper-resistant feature and no safety feature has been removed.

There are other GFCI made like extension cords with GFCI, or GFCI that can be wired in as the plug of an extension cord.  Panel mount GFCI are available for sump pumps, generators or temporary power.

Night Light GFCI, Pilot Light GFCI, another Night Light, Switch Combo, and Cord GFCI

While this might not have been the most exciting read you’ve had today, I hope that this might help on your next DIY Home Improvement Project.

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Before we get into Arc Fault Circuit Interrupters (AFCI), let’s look at their uncle, the Ground Fault Circuit Interrupter (GFCI). GFCIs first appeared in the NEC code in 1971, and then only for swimming pools (not spas) and exterior outlets. Today, bathrooms, kitchens, wet bars, garages, rooftops, spas and any place that water can be a problem must be protected by a GFCI according to code. Without getting into what a GFCI does, it basically can save your life. This has been proved over and over, and unfortunately also proved when GFCIs have been removed, tampered with, or failed.

Let’s start off with some questions:

What is an Arc Fault? An arc fault is when current goes through your wires and somehow takes an unintended course that produces a spark, or arc.

Why don’t my regular breakers protect me from arcs? Your breakers protect you, but what an AFCI does, that a regular breaker can’t, is detect a very low level arc. If not detected, that low level arc could quickly become a life threatening event – in your house!

Why do I need AFCIs and GFCIs? A GFCI protects you and others from fatal electric shocks when a ground fault happens, like if you try to make toast while taking a bath and drop the toaster. That would be a ground fault due to water. As explained above, an AFCI protects you and your valuables from a potential fire caused by a low level arc.

What causes arc faults? Worn or damaged wire; damaged plugs or receptacles; loose electrical connections; screws, nails or staples driven into wires; furniture pinching lamp or appliance cords; broken wire; frayed wires; and even wire chewed on by your pets. Probably anything your kids do when you’re not around. The NEC uses the term combination to describe fault protection. This covers both parallel arcs (two wires arcing together) and series arcs (arc caused by one wire arcing between two damaged areas)

Can I buy AFCI receptacles? Not at this time. Breakers will protect everything downstream from the breaker, but an AFCI receptacle would not protect the wire between the receptacle and the breaker.

Cause and Effects of Arc Faults

Whether you need AFCIs or not depends on your local codes. Not all local codes have accepted AFCIs as code, and some might accept them but not otherwise be up to the current national code. The current NEC Code, 210.12 says “All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets installed in dwelling unit family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sun-rooms, recreation rooms, closets, hallways, or similar rooms or areas shall be protected by a listed arc-fault circuit interrupter, combination-type, installed to provide protection of the branch circuit.”  Even if your local code does not call for it, you still can install AFCIs in your home. Of course, if local code requires AFCIs then they will have to be installed on new homes and remodels.

AFCIs keep improving, just like GFCIs. With these improvements, specifications change and an older AFCI might not pass on a new job, depending on when the permits were issued.  Just because a breaker says AFCI on it, that does not mean it will pass inspection. Your electrician will know which ones to use and your local code office will also have that information.