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Photo of four inch PVC and EMT electrical conduit factory made elbows and EMT compression couplings

Four Inch Electrical Conduit Dimensions

Dear Mr. Electrician:  What are the actual four-inch electrical conduit dimensions? Answer:  The dimensions for various types of 4″ electrical conduits are below.  Four Inch...
Three-way switch wiring diagram with the LINE and the LOAD inside separate switch boxes. LINE power is delivered to the first switch by using a two conductor cable with a bare or green equipment grounding conductor. The LINE wire is connected to the COMMON terminal on the 3-way switch. A three conductor cable goes from one switch box to the other switch box. From the second switch box a two conductor LOAD cable goes to the light fixture or ceiling fan. The black LOAD wire is connected to the COMMON switch terminal and the two white neutral wires are simply joined together with a wirenut.

Three-Way Switch Wiring Diagrams

Dear Mr. Electrician: I need to see some three-way switch wiring diagrams.  I have two switches that control one light in my kitchen.  I...
Universal Electric Motor Internal Wiring Diagram

Single Phase Electric Motor Diagrams

Dear Mr. Electrician:  Where can I find single-phase electric motor diagrams? Answer:  I have compiled a group of single-phase electric motor diagrams and terminal connections...
A permanently installed surge protection device

Surge Protectors

Dear Mr. Electrician:  What are the best whole house surge protectors to protect my home and RV from lightning, and how do I install...
A dirty bathroom fan and grille

Bathroom Fan Repair

Dear Mr. Electrician:  What is needed for a bathroom fan repair?  The exhaust fan in my bathroom stopped working after making noise for several...
Some rough wiring in basement wall studs in an unfinished basement

Basement Renovations

Dear Mr. Electrician:  I am trying to determine the cost for basement renovations.  I called several carpenters, plumbers, electricians, and heating contractors to give...
A fiberglass fish rod is used here to fish a Type NM-B cable through a ceiling.

Wire Pulling In Walls Ceilings

Dear Mr. Electrician:  How do I pull wires in walls and ceilings?   Can I use a metal coat hanger for wire pulling? Answer: Several methods and...
Backside of a Residential Telephone Jack

Telephone Wiring Color Code

Dear Mr. Electrician.  What is the telephone wiring color code for the phone jacks in my house?  I want to replace all the old...
2' x 4' fluorescent kitchen light fixture before removal

Recessed Lighting in a Condominium Kitchen

Dear Mr. Electrician: How do I install recessed lighting in a condominium kitchen? Answer: Installing recessed lighting in a condominium kitchen will vary depending on...
Square D generator sub-panel completed and labeled

Generator Sub-Panel Installation

Dear Mr. Electrician: What is required for a generator sub-panel installation?  I want a generator sub-panel for circuits in my house, such as the...