Voltage indicating coupling for metal conduit systems

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication

Reexamination Certificate

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Details

C439S095000, C439S100000, C174S068300, C174S064000, C333S012000, C285S217000

Reexamination Certificate

active

08058879

ABSTRACT:
A voltage indicating coupling for metal conduit systems to indicate the presence or absence of voltage on a wire enclosed by a section of electrical conduit for a grounded AC power distribution system. Through the use of two opposing rectifiers the National Electrical Code requirement that the entire metal conduit system be grounded is met. The voltage indicating coupling comprises a liquid crystal display (LCD), a static suppression resistor, two opposing rectifiers for grounding purposes, a plastic block housing and two clamping screws with corresponding wire terminals. At least one “hot” conductor enclosed by the section of electrical conduit is capacitively coupled to the conduit creating a complete circuit through the liquid crystal display (LCD), the static suppression resistor and the opposing rectifiers. The path around the circuit is completed by a ground connection on the grounded part of the conduit system, and the ground connection at the transformer.

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