All North American power cords are tested using the UL guidelines provided by the “Follow-up and Inspections Instructions” and based on the UL Standard 817 “Cord Sets and Power Supply Cords.”
Electrical properties of cords are 100% tested for:
Continuity of Ground and Line and Neutral
Hi Pot
Polarity
Insulation Resistance
Continuity of Line and Continuity of Grounding Conductor
All 3-wire grounding power cords are tested to verify that in each product:
The conductors are connected to the intended terminals of the connector, and
There is electrical continuity throughout the entire length of the conductor
A continuity test is carried out under high current, simulating a fault to earth.
Hi-Pot Test
Each power cord should be capable of withstanding, without electrical breakdown, the application of a test potential between line conductors and between each line conductor and grounding conductor, if provided, using a 1500-V ac (40 – 70 Hz) test potential applied for 1 second. Other methods may be used if found to accomplish the intended factory control.
Polarity
Performed on grounded and polarized two-conductor power cords to confirm each of the conductors is connected to the intended terminals of the connector.
Insulation Resistance
The insulation resistance cannot be less than 100 megohms between:
Live parts of opposite polarity
Live parts and dead metal parts that are exposed to human contact or that may be grounded in service
Live parts and any surface of the insulating material that is exposed to human contact or that may be in contact with ground in service
To determine compliance with this requirement, the insulation resistance is measured by a megohmmeter which has an open-circuit output of 500 V or by equivalent equipment.
Mechanical properties are tested on the base of a sampling/monitoring program or during first piece inspection. Among others:
Conductor Secureness
Insertion and Withdrawal forces
Security of Blade or Pin
Security of Insulation
Strain Relief
Stray Strands
Marking
Low Temperature Insertion Test
Blade Pull Test at Elevated Temperature
Jacket retention test
Flexing Test
Abrupt pull test
MEGA Electronics not only ensures all power cords meet UL/CSA standards, but we also meet the regulatory requirements of countries around the world. We manufacture power cords and can ship to any location, usually from stock.
Contact us today to learn how we can help with your next project.