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Ohms Law
P = Watts        E = Volts
I = Amps      R = Ohms
 
August 6, 2017: The transfering of the Mr. Electrician web site over to WordPress has begun.  Old posts and all new posts will be here:  https://www.MrElectrician.TV/blog
 
November 3, 2015:  I wrote a nineteen page booklet about repairing bathroom exhaust fans.  It is a FREE ebook sent to your email address.  Click Here to Request Your FREE Copy of my ebook entitled "Almost Everything You Need To Know To Repair A Bathroom Exhaust Fan In Your Home".

October 21, 2015
:
I recently completed the update of my Fractional Horsepower Electric Motor page. Diagrams and descriptions are posted for each type of electric motor.  (Minor update August 6, 2017, The Motor Diagrams can also be seen on the new WordPress site here.)

I am working on a new page to address the issues faced by humans as they age in place.  The location of electrical outlets and switches and other little things can make a big difference in the quality of life for aging retirees.
April 9, 2015: I recently answered a question incorrectly in another forum.  Fortunately another electrician noticed my error and responded with the correct information.

The question pertained to what was permitted under an older version of the National Electrical Code regarding the proper method by which electrical power is brought from a house out to a detached garage for a sub-panel installation.


Before the publication of the 2008 National Electrical Code, there were additional acceptable methods than there are today for a detached garage sub-panel.  I had forgotten about one method that was not unusual to do, but I had never done it that way.

In the 2005 NEC, article 250.32(B)(2) allowed the required ground rod to be bonded to the neutral (AKA grounded conductor) when there was no other mettalic path for current to flow back to the main house electrical panel  Other mettalic paths could be a water pipe, a telephone line, a cable TV line and even an alarm circuit.  In addition there can be NO equipment grounding conductor installed with the power conductors.

Article 250.32(B) in the 2014 National Electrical Code requires that an equipment grounding conductor be installed with the power conductors to feed a sub-panel in a detached building whether or not there is another metalllic path.  Also, the neutral cannot be bonded to the equipment grounding conductor in a sub-panel.  There is an exception for previously installed systems as long as no other mettalic path exists.

The reason for the ground rod requirement in Article 250.32(A) in a detached building is lightning protection.

With the neutral conductor and the grounding conductor bonded together in a sub-panel, there is a remote chance under certain conditions that the metal connected to the electrical sub-panel, including the sub-panel, could become energized and very hazardous to the touch.

The equipment grounding conductor is now required in a sub-panel installation because it has been determined that a ground fault to earth will not likely trip a circuit breaker or blow a fuse in a sufficient period of time (Miliseconds).  I have experienced this myself, by accident working on an underground lighting circuit.  When a live wire hit the dirt it made a POOF sort of sound, but it did not trip the circuit breaker.   Top
 
April 8, 2015: I have noticed that many people disregard safety when doing home rennovations.  A construction worker in any trade is required by the Occupational Safety and Hazard Administration (OSHA) to wear protective clothing and apparatus to protect against hazards particular to their tasks.

A homeowner doing remodeling work around his or her own home is no different than a construction worker and needs protecting as well.

If you will be working in the garden, some useful articles for protection outside are: bug repellent, work gloves, knee pads or a piece of carpet, goggles, dust masks, hearing protection, portable GFCI device, steel toe shoes, hard hat and face shield, and perhaps protective clothing.

Working inside of the house has additional hazards such as dust and falling.  A P100 respirator should be used for most dusty situations including lead dust.

A properly sized ladder is important. Chairs, stools, and toilets should not be used in place of a ladder.  I think for a homeowner who has eight foot ceilings, a five foot ladder should suffice, but I have noticed that they are not sold everywhere. If five foot is not available, consider a six foot stepladder.

A non-contact voltage detector comes in handy when working with electrical wiring.

I urge all homeowners to refrain from climbing up on your roof to work on a project.  Fall protection is required when working on a roof.  This may consist of approved netting installed temporarily, but securely or you can use harnesses. Harnesses require special anchor points on the peaks to which a harness is attached to.  HOWEVER, you must have a prepared rescue plan and someone else (Or two) to implement it very quickly.

If a person falls and is saved, but dangling by a harness, their life is in great danger. The strain that the harness puts on the extremities causes blood to stop flowing.  I forget the timeframe, but it is within seconds that the person must be released from the harness. Any longer and paramedics will have to give that person a shot in each arm before the harness can be removed without threatening his or her life.

I received my 30 hour OSHA training card last year as part of my CEU’s to maintain my electrical license.  It was a long but terrific class and the teacher was excellent. During the class, statistics were presented on how much job safety has improved and the number of injuries and deaths has dropped considerably in the workplace. However no statistics were available (I asked) for the number of injuries sustained by do-it-yourself homeowners working around their houses.

Professionals receive safety training on their job.  I don’t think homeowners consider safety at all when planning a do-it-yourself home remodeling project.

I urge all of you to give safety a long thought and do what is necessary to protect yourself from harm when working around the house.

29 CFR 1926 OSHA Construction Industry Regulations

http://www.mrelectrician.tv/safety.html

https://www.osha.gov/      Top
March 19, 2015: Spring will be here tomorrow and many of us will be heading outside to work around the house as the weather permits.  With that work, you will be using tools and some of them will be powered by electricity. 

When using power tools outside, be sure to plug your cords into a Ground Fault Circuit Interupter Receptacle (GFCI).  A properly working GFCI will protect you from electric shock or electrocution should there be a problem with your power tool or extension cord.

In addition to plugging your extension cord into a GFCI receptacle, I also recommend that you use a portable GFCI cord device.  This provides an additional level of protection by shutting down if the neutral conductor on the circuit becomes disconnected.  This level of GFCI protection is normally used on construction sites, but rarely at home.

It is important to have the GFCI protection because when working outside it is easier for your body to be grounded to earth which creates a path for electricity to flow back to the transformer on the pole.  Also, homeowners working around their house usually don't put a lot of thought into safety and protective gear or shoes. Top
 
February 27, 2015: I recently completed a new page that descibes the wiring for 3-way switches.  You can see a simple wiring diagram for this type of switch operation here: 3-way Switch Wiring Diagram

I know it seems a long way off right now, but pool season will be here in a few months.  I cannot emphasize enough that you should have your pool tested for bonding and grounding by a qualified licensed electrical contractor.  Also any GFCI circuit breakers  and receptacles should be tested as well.  Commercial pools are required every few years to be tested, but I am not aware of any jurisdiction that requires a home based swimming pool to be tested.

I have done pool testing for several years now on commercial pools.  Though these pools are well maintained, I have never found one to be completely free of problems.  Sometimes the GFCI goes bad.  Other times I have found that the bonding wire was no longer connected.  In some instances I have found that the original bonding connection to a ladder or hand rail was no longer functioning.  All of these shortcomings can result in a shock or electrocution hazard.   Top
February 13, 2015:  Dewalt Tool Company has a new wall scanner on the market.  From the Dewalt press release: "The DEWALT DCT419S1 12V MAX hand held wall scanner features patent-pending sensing technologies that detect five classes of embedded materials: wood, ferrous metal, non-ferrous metal, plastic, and unshielded live electric behind wall surfaces up to 3 inches deep. This unit can scan through multiple wall surfaces including drywall, plywood, concrete and ceramic tile."

A tool such as this redefines the term Stud Finder.  It is a sure bet to be very useful in determining where obstacles are behind finished wall surfaces before you start to work.

February 5, 2015:  I found an interesting article in the January issue of "Electrical Construction and Maintenance" magazine.  The article is all about lighting dimmers and how to choose the correct one for the type of lighting that will be illuminating each room.  Incandescent and halogen light bulbs usually don't have issues with dimmer switches unless you are trying to dim low voltage lighting.  With low voltage lighting  there are transformers that bring down the voltage to 12 volts.  However not all transformers respond well to being controlled by dimmers.

In addition compact fluorescent light bulbs and LED lighting require specific dimmers made for them and their power supplies.  You can read the article online here: "Shining the Light on Dimming".

The choices of dimmers can be mind boggling.  It no longer is just a matter of style, but also of functionality.  Certain types of light bulbs require specific types of dimmers

When considering the purchase of an electronic energy saving light bulb, think if you intend to use that new type of light bulb with a dimmer wall switch.  If so, then check with the light bulb manufacturer as to the type of dimmer that they recommend for use with their product.

I have posted a video online about the Lightning Switch.  It is a type of wireless switch that does not need wiring installed to a light fixture to control it.  You can see it here: http://youtu.be/9Qi8sUxsyFA     Top
 
January 27, 2015: I was reading my latest copy of Electrical Contractor magazine (January 2015) and saw some great product announcements.  Square D is now making AFCI circuit breakers that also have GFCI protection.  In addition Siemens has also announced that they now have an AFCI circuit breaker that is also a GFCI protector.  The dual function circuit breaker model numbers are as follows:
Square D 15 amp # QO115DF,  20 amp #QO120DF. 

Homeline 15 amp #HOM115DFC, 20 amp #HOM120DF.

Siemens Q115DF and Q120DF.

In addition the folowing manufacturers also produce dual function AFCI/GFCI circuit breakers:
Cutler Hammer Type CH 15 amp #CHFAFGF115, 20 amp #CHFAFGF120.
Cutler Hammer Type BR 15 amp #BRLAFGF115, 20 amp #BRLAFGF120.

GE THQL1115DF 15 amp,   THQL1120DF 20 amp.


January 25, 2015
: I started to review the materials and business cards that I received at Affiliate Summit West 2015 in Las Vegas last week.  I would like to thank everyone who expressed an interest in www.MrElectrican.TV and for all of their valuable input.  I became inspired and educated from attending this terrific conference for affiliate marketers.  Top
  Doggy Dan's Online Puppy Training
 

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Updated October 5, 2017

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