1/2″ (16mm) Electrical Conduit Dimensions

1/2" is the trade size, not the actual dimension of electrical conduit.  16 is the metric designator not the actual dimension in millimeters.  The...

3/4″ (21mm) Electrical Conduit Dimensions

3/4″ is the trade size, not the actual dimension of electrical conduit.  21 is the metric designator not the actual dimension in millimeters.  The...

Aluminum Wiring

Dear Mr. Electrician: I am planning to have the electrical service to my house upgraded. The licensed electrical contractor that I am using will be...

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3 way and 2 way light switch wiring with the line and load in the same switch box.. The larger square box was used to accommodate the extra wires. In this instance the white wire in the 3 conductor cable was reidentified with blue electrical tape to indicate that it is not a neutral conductor. The line hot wire from the 2 conductor feed cable is spliced through to go to the 3 way switch at the other end of the room.

Three Way Light Switch Wiring Diagram

Dear Mr. Electrician: I have two switches that control one light in my kitchen.  I am...
The finished ceiling mounted Wiremold surface box for the garage door opener

Wiremold for a Garage Door Opener Electrical Receptacle

Dear Mr. Electrician:  I need to install an electrical receptacle outlet on the ceiling of my...

Electrical Conduit Dimensions

Electrical Pipe and Conduit Dimensions From 1/2" to 6" Trade Size USA Trade Size Metric  1/2"  16  3/4"  21  1"  27  1 1/4"  35  1 1/2"  41  2"  53  2 1/2"  63  3"  78  3 1/2"  91  4"  103  5"  129  6"  155 The information below was derived from...
A dirty bathroom fan and grill. Bathroom fans that share a home with pets tend to get this amount of dirt, dust, and dander.

Bathroom Fan Repair

Dear Mr. Electrician:  The exhaust fan in my bathroom stopped working after making some exceptional...
An old and a new water pipe ground clamp on an older water pipe. Note the corrosion on the old clamp and the use of an armored grounding conductor.

Grounding Electrode System

Dear Mr. Electrician: I recently hired an electrician to fix something in my very old...

Homeowner Purchases Materials For the Contractor

Dear Mr. Electrician: I want to get a bunch of electrical projects done around my...
Concentric knockouts (KO's) ready for removal.

Removing Concentric Knockouts from an Electrical Load Center Panel

Dear Mr. Electrician:  What is the best way to remove the pre-punched concentric knockouts in...
The hole cut-out ready for a metal receptacle box. I held the face of the electrical box against the wall and penciled an outline to follow with my Drywall Saw.

Electrical Receptacle Box Installation in an Existing Wall Using Madison Bars

Dear Mr. Electrician: I want to install an electrical outlet on a dedicated circuit for...
Bad Grounding for Telephone, TV, and Power

Grounding and Bonding For TV and Telephone

Dear Mr. Electrician: My neighbor was blown out of her chair when lightning hit her...

Arc Fault Circuit Interrupters

Dear Mr. Electrician: Why am I required to have my brand new house wired with...
Wall studs in an unfinished basement ready for wall board to be installed.

Estimates for Basement Renovations

Dear Mr. Electrician: I am planning to have my basement finished with a living space...
A metal outlet box installed on wood lathe using small wood screws.

Install an Electrical Receptacle Outlet in an Existing Wall

Dear Mr. Electrician: I want to install an outlet on a dedicated circuit for my...
Universal Motor Wiring Diagram

Fractional Horsepower Electric Motor Diagrams

Wiring Diagrams of Fractional Horsepower Electric Motors Split Phase Induction Split Phase Permanently Connected Capacitor Split Phase Capacitor...

Testing a Dishwasher Appliance for Power

Dear Mr. Electrician: I use my dishwasher for storage and occasional dish washing. Last night...
A microwave oven installed under a cabinet.

Installation of a Microwave Oven Over a Stove

Click here to see more photos of an outlet box being installed using Madison Bars.