DOT•PLUG Breakaway Wiring System for Roadway Lighting Systems
Safety concerns have been raised over the last decade over the Electrical Shock Hazards that have been associated with municipal and roadway lighting systems. Insulation breakdown from aging infrastructure has been documented from coast to coast (see these articles for reference), along with missing access covers, animal penetration, wind damage, water damage, and salt corrosion. Implementing the use of an ELCI will help eliminate these hazards and reduce the liability associated.
stands for "Equipment (sometimes "Earth") Leakage Circuit Interrupter",
and is a device intended to mitigate ground fault leakage specifically for
the protection of equipment. A "GFCI" (Ground Fault Circuit Interrupter)
is essentially the same as an "ELCI", but for the most part differ in trip
threshold of leakage current and/or circuit voltage. A "GFCI" indicates
that "Personnel" protection is being provided. This calls for a trip
threshold of 4 to 6 mA with a maximum response time of 25ms and circuit
voltage from any single current carrying conductor to Ground cannot exceed
150V. Thus, even if a 4 to 6 mA trip threshold is employed, on a 480V
circuit, or even a 240V elevated (L1, N), providing personnel protection
is not feasible. In order to provide personnel the greatest level of
protection given circuit criteria, use of an "ELCI" is prescribed for
personnel protection. Other applications for "ELCI" devices may call for
higher trip thresholds of 10, 30, or even 100mA as baseline leakage as
some of these applications may well exceed 6mA when a load device is
An ELCI can easily be employed or retrofitted into existing MG Squared DOTPLUG systems. In fact, in Miami Dade County Florida, hundreds of DOTPLUG systems have been either ordered or retrofitted with ELCI systems.
Close-up below of the ELCI specifications
Avoiding Electrical Hazards
Electrical Hazards are much too common in public areas This hazard was identified at Austin Convention Center (Austin, TX). An ELCI would offer protection.
An open transformer base with a child's
baseball seen inside seen in the photo below (Philidelphia, PA).
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