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Showing posts with label JW Home Inspections. Show all posts
Showing posts with label JW Home Inspections. Show all posts

Thursday, February 26, 2015

Death By Code




Death by Code
I came across this article by Jeffrey S. Sargent (read below) and thought it was interesting.
There are numerous building codes in our country. While some states allow for local jurisdiction to amend codes, some states have statewide codes. As a home inspector in Hilton Head (and surrounding areas), South Carolina, I see variations in building codes from one town to the next. When political and economic concerns get involved, safety and common sense can fall to the wayside. Add local interpretation of adopted codes, and areas where code officials have little power, and you may have a mix for tragedy, such as the story told by Jeffrey, which resulted in death as a result of a local jurisdiction amending the codes. While this may be extreme, I hope it calls forth some interesting and productive discussions on code enforcement and code adoptions.

A Cautionary Tale

by Jeffrey S. Sargent

I had dinner recently with a good friend and colleague, and our conversation drifted to the topic of 2014 National Electrical Code® adoption. I told him adoptions were going well, but that some jurisdictions had passed or were contemplating amendments reducing the level of safety afforded by the NEC. The only “technical” support for these amendments, in most cases, were anecdotal accounts of operational problems and overstated financial concerns.
This led my friend to share an experience he had while working as the chief electrical inspector of a mid-sized city. He’s no longer employed by that community, but it was clear that the impact of what happened had not faded.
He told me he’d been at his office early on a Monday morning, and that he’d just closed out the last inspection report from the previous week when his phone rang. The caller explained he was interested in learning about the background of a city-specific amendment to the NEC. The amendment had exempted receptacles installed in garages and on the outside of homes from the requirement that they be provided with ground-fault circuit-interrupter (GFCI) protection. The inspector explained the exception was on the books prior to him assuming the chief inspector’s job and had been added in response to negative feedback on the requirement that had been received by a member of the city council from local homeowners. The council member was in the homebuilding business.
Anyone who has served responsibly in the public sector understands the governmental chain of command, and in this case the inspector did what he believed was right by not disparaging those who were elected by the citizens of that city. He also knew that, had he been in the chief’s position at the time the amendment was proposed, he would have made every possible attempt to dissuade the council from reducing the level of safety established in a national consensus code. As it was, the amendment stood, and he had no desire to attempt to reverse a decision of the city council.
The gentleman on the other end of the line began calmly explaining the reason for his call. His family had recently moved into a new home in the city, and during the previous weekend they held a cook-out at their home. At the time, electrically heated outdoor grills were a new and easy way to cook outdoors—just plug in and cook. This family’s grill was flawed, however. The man’s young son had come in contact with the grill—which was plugged into an outdoor receptacle that lacked GFCI protection—at the same moment he was in contact with ground, and received a severe shock. He died en route to the hospital.
The electrical inspector was speechless. There were no words he could offer to justify why the amendment existed. He knew the amendment was wrong, but now he knew just how wrong: based on what the caller was saying, the amendment might be complicit in the death of a child. A lawsuit was filed against the city, and an out-of-court settlement was reached. The amendment was subsequently repealed.
Deeply disturbed by what had happened, the inspector vowed he would never again work in a jurisdiction where convenience and financial considerations were placed above safety. He never again wanted to be in the position of having to explain to a grieving parent the shallow reason why a fundamental safety feature had been amended out of a national consensus code for safe electrical installations.

End of article.

Thanks for reading my Blog.

John M. Wickline, President
JW Home Inspections, Inc.
JWInspect.com 

Bluffton, Hilton Head, Sun City, Okatie, SCNACHI, JW Home Inspections, Inc.
 

Friday, February 13, 2015

Arc-Fault Circuit Interrupters (AFCIs)



Arc-Fault Circuit Interrupters (AFCIs)
by Nick Gromicko and Kenton Shepard


Arc-fault circuit interrupters (AFCIs) are special types of electrical receptacles or outlets and circuit breakers designed to detect and respond to potentially dangerous electrical arcs in home branch wiring.

How do they work?

AFCIs function by monitoring the electrical waveform and promptly opening (interrupting) the circuit they serve if they detect changes in the wave pattern that are characteristic of a dangerous arc. They also must be capable of distinguishing safe, normal arcs, such as those created when a switch is turned on or a plug is pulled from a receptacle, from arcs that can cause fires. An AFCI can detect, recognize, and respond to very small changes in wave pattern.

What is an arc?

When an electric current crosses an air gap from an energized component to a grounded component, it produces a glowing plasma discharge known as an arc. For example, a bolt of lightning is a very large, powerful arc that crosses an atmospheric gap from an electrically charged cloud to the ground or another cloud. Just as lightning can cause fires, arcs produced by domestic wiring are capable of producing high levels of heat that can ignite their surroundings and lead to structure fires.

According to statistics from the National Fire Protection Agency for the year 2005, electrical fires damaged approximately 20,900 homes, killed 500 people, and cost $862 million in property damage. Although short-circuits and overloads account for many of these fires, arcs are responsible for the majority and are undetectable by traditional (non-AFCI) circuit breakers.

Where are arcs likely to form?

Arcs can form where wires are improperly installed or when insulation becomes damaged. In older homes, wire insulation tends to crystallize as it ages, becoming brittle and prone to cracking and chipping. Damaged insulation exposes the current-carrying wire to its surroundings, increasing the chances that an arc may occur.

Situations in which arcs may be created:
  • electrical cords damaged by vacuum cleaners or trapped beneath furniture or doors.
  • damage to wire insulation from nails or screws driven through walls.
  • appliance cords damaged by heat, natural aging, kinking, impact or over-extension.
  • spillage of liquid.
  • loose connections in outlets, switches and light fixtures.
Where are AFCIs required?

Locations in which AFCIs are required depend on the building codes adopted by their jurisdiction.

The 2006 International Residential Code (IRC) requires that AFCIs be installed within bedrooms in the following manner:
E3802.12 Arc-Fault Protection of Bedroom Outlets. All branch circuits that supply120-volt, single-phase, 15- and 20-amp outlets installed in bedrooms shall be protected by a combination-type or branch/feeder-type arc-fault circuit interrupter installed to provide protection of the entire branch circuit.
Exception: The location of the arc-fault circuit interrupter shall be permitted to be at other than the origination of the branch circuit, provided that:
1.      The arc-fault circuit interrupter is installed within 6 feet of the branch circuit overcurrent device as measured along the branch circuit conductors, and
2.      The circuit conductors between the branch circuit overcurrent device and the arc-fault circuit interrupter are installed in a metal raceway or a cable with metallic sheath.
The National Electrical Code (NEC) offers the following guidelines concerning AFCI placement within bedrooms:
Dwelling Units. All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets installed in dwelling unit in family rooms, dining rooms, living rooms, parlors, libraries, dens, 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.
Home inspectors should refrain from quoting exact code in their reports. A plaintiff's attorney might suggest that code quotation means that the inspector was performing a code inspection and is therefore responsible for identifying all code violations in the home.  Some jurisdictions do not yet require their implementation in locations where they can be helpful.

What types of AFCIs are available?

AFCIs are available as circuit breakers for installation in the electrical distribution panel.


Nuisance Tripping

An AFCI might activate in situations that are not dangerous and create needless power shortages. This can be particularly annoying when an AFCI stalls power to a freezer or refrigerator, allowing its contents to spoil. There are a few procedures an electrical contractor can perform in order to reduce potential “nuisance tripping," such as:
  • Check that the load power wire, panel neutral wire and load neutral wire are properly connected.
  • Check wiring to ensure that there are no shared neutral connections.
  • Check the junction box and fixture connections to ensure that the neutral conductor does not contact a grounded conductor.
Arc Faults vs. Ground Faults

It is important to distinguish AFCI devices from Ground Fault Circuit Interrupter (GFCI) devices. GFCIs detect ground faults, which occur when current leaks from a hot (ungrounded) conductor to a grounded object as a result of a short-circuit. This situation can be hazardous when a person unintentionally becomes the current’s path to the ground. GFCIs function by constantly monitoring the current flow between hot and neutral (grounding) conductors, and activate when they sense a difference of 5 milliamps or more. Thus, GFCIs are intended to prevent personal injury due to electric shock, while AFCIs prevent personal injury and property damage due to structure fires.

In summary, AFCIs are designed to detect small arcs of electricity before they have a chance to lead to a structure fire. 


Thanks for Reading this article
brought to you by
John M. Wickline, President



Home Inspector Hilton Head Bluffton Beaufort Sun City Okatee
JW Home Inspections, Inc. Hilton Head Island Beaufort Bluffton Okatie Sun City SC