Menu
Search
Menu

Electrical Continuity

The NEC and CEC requires all metallic building components that are deemed likely to become energized in a fault situation to be bonded such that they can safely conduct the power to ground until the fault is cleared, ie breaker trips or fuse blows. The electrical continuity of a system is its ability to conduct an electric current. Each system is characterized by its resistance, denoted as R. If R=0 Ω: the system is a perfect conductor; if R is infinite: the system is a perfect insulator. The lower the resistance of a system, the better its electrical continuity. All Cablofil® splices are tested and comply with CSA, IEC, NEC, NEMA and UL requirements for low resistance. Each of these standards use the same basic test methodology but have slight variations. The goal of the electrical continuity tests is to ensure that the resistance across the splice is low enough to safely conduct and clear faults. Complete test results are available upon request from our technical department. The following is a summary of the results:

Splice Resistance Test

IEC

NEMA/CSA/UL

Test Method Voltage

25VAC

30VDC

Measurement Location

50mm from splice

1/16" from splice

Resistance Requirements

50mΩ

.33mΩ

Results

.82mΩ

Pass

Cable Tray Resistance

Test method Voltage

25VAC

no requirement

Measurement Location

500 mm Section

n/a

Resistance Requirement

50mΩ

-

Results

3.12mΩ

-

Test Configuration
<1

Promotes good EMC within an installation:
The metal structure of the cable tray absorbs some of the electromagnetic disturbance and converts it into current that is quickly conducted to the grounding network.

Electromagnetic disturbance