Eletrical zero energy verification aid

by Dec 18, 2018Electrical Safety, Lockout

Electrical zero energy verification aid


With the CSA Z460 standard and the regulatory changes in Quebec, the aim is to find the most reliable method for validating the absence of electrical energy.

Light-emitting diodes (LED) have existed for a few years. In the 2000s, there was a verification method that consisted of 3 red lights and a module with fuses that was inserted into the electrical box. Thereafter, an LED module (figure 1) was released that reads from 40 to 750 Volts. This module has been installed at many of our clients. We found a way of keeping the certification of the electrical assembly (CSA, Intertek, QPS, ULC or others). Moreover, please do not hesitate to contact us if you have needs.

Figure 1

Figure 2

In the two cases shown above (figures 1 and 2), it is important to ensure that the lights are on before opening the electrical circuit (OFF position) to ensure that the lights were functioning well. For the first module (figure 1), 2 modules were needed to check the power supply of the disconnect switch and its load (motor side). Now, with the new module from Hubbell, the upstream and downstream can be verified directly on the disconnect switch (figure 2). In any case, electricians must still check with their measurement devices before replacing the components following the steps for creating an Electrically Safe Work Condition from CSA Z462 and NFPA 70E.

Contact us for more information!

Tell us about your needs and an expert will answer you!

Intervention Prévention Inc.

Intervention Prévention concentrates its operations in the field of work safety, offering specialized services following Standards CSA Z462 – Workplace Electrical Safety, CSA Z460 – Control of Hazardous Energy: Lock-out and Other Methods, and CSA Z432 – Safeguarding of Machinery.


137-2020 rue André-Labadie
Beloeil (Québec)
J3G 0W6