VeriSafe™ Absence of Voltage Testers (AVTs)

UL 1436 outlines extensive requirements for AVTs to ensure the absence of voltage test function is fail-safe and reliable. Key features include active indicators, built-in overcurrent protection, automatic internal diagnostics, connection verification, and SIL 3 reliability for all safety functions. 

 Voltage indicators, test points, and AVTs are all permanently installed devices that only test the point in the circuit where the test leads are terminated. However, AVTs also confirm that test leads are properly connected as part of the automated testing process and return an error if they are not. 

Voltage indicators and test points help workers verify the presence of voltage without entering an enclosure, but they can create a false sense of security when used to confirm absence of voltage. For this reason, NFPA recently updated NFPA 70E to draw a clear distinction between the appropriate uses of test points and AVTs. 

VeriSafe™ AVTs also do not require portable testers to confirm absence of voltage.

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NFPA 70E 120.6 outlines the process for establishing and verifying an electrically safe work condition. Step 7 requires testing each phase conductor or circuit part both phase-to-phase and phase-to-ground using an adequately rated portable test instrument. The instrument must also be verified as operating correctly on a known voltage source before and after testing — a process commonly referred to as "Live-Dead-Live." 

Exception No. 1 to Step 7 permits the use of a permanently mounted absence of voltage tester in place of a portable instrument. VeriSafe satisfies this exception, offering three key advantages: 

• Worker safety — Isolates workers from exposure to energized parts 

• Efficiency — Reduces the time required to verify an electrically safe work condition 

• Accuracy — Eliminates the risk of human error in the testing process 

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VeriSafe 600V supports 3 phase AC applications up to 600V, while VeriSafe 1kV supports up to 1000V and includes additional features that may be useful even in sub-600V applications, such as: 

• DC circuits compatibility 

• Can be powered via PoE (Power over Ethernet) 

• Rated for hazardous locations 

• Network capable 

• Supports dual indicators, enabling placement outside the arc flash boundary 

Both devices provide SIL 3 absence of voltage verification without opening an electrical enclosure, and all VeriSafe models test for AC and DC voltage when confirming absence of voltage. 

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The VeriSafe 1kV Network Module enables smarter system monitoring by sharing data directly from the AVT. Key capabilities include: 

• Historical data and test results — Review past absence of voltage tests for recordkeeping and auditing 

• Automatic voltage measurement — Continuously monitor voltage across phases without opening equipment doors or covers 

• Fast fault identification — Quickly pinpoint voltage loss in any phase for faster troubleshooting 

Consider the Network Module when system visibility, audit trails, or remote diagnostics are priorities for your application. Easily connects to PLCs, HMIs, SCADA systems, and industrial control networks with Ethernet/IP and Modbus TCP protocols. Networking capability is available with VeriSafe 1kV only. 

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VeriSafe is suited for any industry where workers may be exposed to hazardous electrical energy. Applications that benefit most include those where: 

• Panels are frequently accessed — Repeated access increases both the risk of human error and the time spent verifying absence of voltage with a portable tester. VeriSafe automates and completes the process in ten seconds. 

• Incident energy levels are high — The higher the arc flash hazard (measured in cal/cm²), the greater the value of keeping workers away from energized equipment 

• Non-electrical workers need access — Mechanical technicians and others who regularly work inside equipment benefit from a built-in, automated verification process that doesn't rely on portable test instruments

Yes. VeriSafe can be integrated into previously installed equipment to isolate workers from electrical hazards, reduce the Risk Priority Number (RPN) of a given process, and improve overall productivity. 

VeriSafe’s Indicator Modules install into a standard 30mm knockout, and the Isolation Module mounts directly to a DIN rail.