How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manufactured and modular homes

Why is a strain relief clamp necessary for the cord connection to some electric appliances?

Tuesday, June 26, 2018

Appliances like a kitchen disposal and water heater do not come with a power cord installed by the manufacturer because they can be either hard-wired through conduit to an electrical box or utilize a power cord to connect to a receptacle. Clothes dryers do not have a power cord already installed because the homeowner has to match the number of prongs at the end of the cord to the slots in their dryer receptacle at home: either an older-style 3-slot receptacle or a newer 4-slot receptacle. So the cord is purchased separately. 

    When a power cord is connected to terminals inside the appliance, the point where the cord penetrates the shell of the appliance needs to have a strain relief clamp, also sometimes called a cord connector, as a securing device. It attaches to the opening (knockout) and snugs down around the cord to do two things:

  1. Keep the wire connections of the cord inside the appliance from coming loose if the cord is tugged.
  2. The rounded edges at the outside of the clamp keep the edge of the casing from cutting into the cord sheathing from any back-and-forth movement of the cord.

    Here’s three examples below of missing strain relief clamp locations we find during a typical home inspection.


    And here’s a strain relief clamp correctly installed at the back of a dryer.

• • • • • • • • • • • • • • • • • • • • • • • • • • •

Here’s links to a collection of some of our other blog posts about APPLIANCES: 

What are the building code requirements for installing an appliance (furnace, air handler, water heater) in the attic?

Which house appliances need a dedicated electrical circuit? 

Is a washing machine drain hose required to be secured at the standpipe?

When was GFCI-protection for kitchen dishwasher receptacle outlet first required? 

Why does venting a clothes dryer into a garage, attic, or crawl space cause problems?

Does a refrigerator water supply line require a shutoff valve behind it? 

My spa tub stopped working. What's wrong?

What is the maximum recommended height above the floor for an above-the-range microwave?

Why would a home have natural gas appliaces but no gas meter? 

Is a hot water faucet required at a washing machine?

Can I remove a 240-volt range receptacle and hard-wire the range? 

 Can a dishwasher be wired to a kitchen counter small appliance receptacle circuit?

Why is it bad to have a clothes dryer vent near an air conditioning condenser (outdoor unit)? 

Do home inspectors test the appliances?

How do you inspect a dryer vent? 

• Why is there a water hose connected to the back of the clothes dryer?

    Visit our ELECTRICAL and APPLIANCES pages for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

Water Heaters

Water Heater Age

"What Are The

Signs Of..."

Septic Tank Systems

Structure and Rooms

Plumbing Pipes

Termites, Wood Rot

& Pests

Sinkholes

Stairs

When It First

Became Code

"Should I Buy A..."

Park Model Homes

Site

Shingle Roofs

Safety

Stucco

Remodeling

Wind Mitigation

Roof and Attic

"Does A Home

Inspector...?"

Pool and Spa

"What Is The Difference Between..."

Radon

Brick

Plumbing

Concrete and

Concrete Block

Metal Roofs

Foundations

Modular Homes

Rain Gutters

Mold, Lead & Other Contaminants

Condominiums

Older and

Historic Houses

Crawl Spaces

Mobile-Manufactured Homes

Building Permits

Life Expectancy

Clay Soil

Insurance

Floors

Insulation

Toilets

Exterior Walls

& Structures

Generators

Common Problems

HUD-Code for

Mobile Homes

Garages and Carports

Flat (Low Slope) Roofs

Electrical Panels

Sprinkler Systems

Electrical Receptacle Outlets

4-Point Inspections

Hurricane Resistance

Frequently Asked Questions (FAQ)

Home Inspection

Heating and Air Conditioning

Building Codes

Fireplaces and Chimneys

Inspector Licensing

& Standards

Energy Efficiency

Washers and Dryers

Electrical

Kitchens

Doors and Windows

(placeholder)

Cracks

Electrical Wiring

Click Below  

for Links

to Collections

of Blog Posts

by Subject

Plumbing Drains

and Traps

Appliances

Smoke & CO Alarms

Aging in Place

Top 5 results given instantly.

Click on magnifying glass

for all search results.

Bathrooms

Lighting

AFCI, CAFCI,

DFCI, & GFCI

Sinks

Air Conditioner & Furnace Age/Size

Attics

Electrical Switches

Siding

Search

This

Site

Water Intrusion

Electrical - Old

and Obsolete

(placeholder)

Foundation Certifications

Tiny Houses

About McGarry and Madsen

(placeholder)

Wells

Buying a home in North/Central Florida? Check our price for a  team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.

Moisture Problems

Crawl Spaces

Bedrooms

Closets