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Home » Technical guide » Electrical continuity

Electrical continuity

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Fundamental to providing safety to people and property, electrical continuity also plays an essential role in the EMC performance of an electrical installation.

DEFINITION

The electrical continuity of a system is its ability to conduct electric current. Each system is characterised by its resistance R.
If R=0 Ω, the system is a perfect conductor.
If R is infinite, the system is a perfect insulator.
The lower the system's resistance, the better is electrical continuity will be.

THE IMPORTANCE OF HAVING EXCELLENT ELECTRICAL CONTINUITY

Even at the same electrical potential each part of the cable tray helps dissipate any fault currents :

 

TESTED FOR ELECTRICAL CONTINUITY

CABLOFIL Trays
Tests show that CABLOFIL more than meets the requirements of the standard IEC 61537, which stipulates that cable tray resistance must not exceed 5mΩ/m.

CABLOFIL Couplers 
The standard IEC 61537 states that coupler resistance must not exceed 50mΩ. The test involves running an electric current trough the system (cable trays + couplers) and measuring coupler resistance.		  

TEST RESULTS

An average of 0.82 mΩ for CABLOFIL couplers. This is between 50 and 80 times better than the requirements given in the standard.
All CABLOFIL couplers are tested and compliant. Please contact our technical support service for the full results of these tests.

Please note that epoxy coated metallic cable trays do not conduct electric currents