How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured 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:
- Keep the wire connections of the cord inside the appliance from coming loose if the cord is tugged.
- 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.
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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?
• What are the most common defects with over-the-range microwaves?
• Are a range and refrigerator required kitchen appliances for a house to pass FHA inspection?
• What are the code requirements for an outdoor dryer vent cover?
• What is the maximum length for a clothes dryer vent?
• Why are my ceiling fan blades drooping?
• 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.
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