What is strain relief test?

3-3-18. Understanding the Strain Relief Tests. The “Understanding the Product Safety Tests” Series. The Strain Relief Test is conducted on products that have an electrical cord or cable permanently attached to the product. This includes power cords, output cords, jumper cables, daisy chain cables, etc.

How do you choose strain relief?

When looking at the correct style strain relief, find the ones that have the correct thread size or mounting hole size. Then look at the cable diameter specification range and choose the one that has the best fit. Ideally, the cable diameter should be towards the top end of the cable range for the strain relief chosen.

What means strain relief?

A strain relief, also commonly called a bend relief, is important to the electrical and mechanical integrity and overall performance of a medical cable assembly. A strain relief is used to provide a transition from flexible cable to a rigid connector or connection point.

Does strain need relief?

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.

What is cord anchorage?

Cord Anchorage Force & Torque Tester is designed to verify whether the cord anchorage used in the appliances provided with a flexible cord protects the conductors at the terminals from excessive stresses and protects the conductive insulation against abrasion.

How do strain reliefs work?

A strain relief or cable gland can provide protection to the wires and cable by securing the cable of a power cord to the panel of the electrical equipment. It helps to protect from stress and damage as it runs through the panel of the equipment.

Do I need a strain relief on my dryer cord?

A cord strain relief is required to prevent accidental pulled from the unit. You will notice a black white and red wire connected to the terminal block and a white ground wire connected on the green screw mount.

What is normal strain?

Normal strain occurs when the elongation of an object is in response to a normal stress (i.e. perpendicular to a surface), and is denoted by the Greek letter epsilon. A positive value corresponds to a tensile strain, while negative is compressive.

Are extension cords UL listed?

Currently UL approves most extension cords. When UL approves equipment it is marked with the UL label and on that label will be the name of the equipment or the assembly that is approved.

Are 4 prong to 3-prong dryer adapters Safe?

If you were to change from a four prong to a three prong and your dryer is designed to use 120 volts at some point, then that current will have to be returned on the ground leg. This is not acceptable by NEC code, nor is it safe.