Power alert improves electrical safety
A
Marsh Bellofram Europe product story
Edited by the Engineeringtalk editorial team
Sep 3, 2007
The UPA power alert is hard wired to the circuit breaker or other disconnect devices and pre-verifies from the outside of the control panel or enclosure that full electrical isolation exists.
A universal power alert (UPA) device gives a clear, visual indication of any residual power within an electrical enclosure, leading to higher levels of safety for operating, service or maintenance personnel.
Marsh Bellofram Europe's latest UPA-130 has been designed to be fitted in a standard 30mm diameter panel knockout, while the original UPA-100 fitted a 1.25-inch conduit knockout Both products provide identical levels of safety when fitted to control panels, circuit breaker boxes or other types of enclosed electrical isolating devices.
The features include the verification of zero energy for safe working conditions, or the detection and indication of either single or three-phase AC voltages within an enclosed unit.
The presence of DC or stored energy is also similarly identified.
This helps to reduce the potential for arc-flash and electrocution risk for personnel having the responsibility for undertaking maintenance or repairs on electrical machinery or equipment.
The UPA power alert is hard wired to the circuit breaker or other disconnect devices and pre-verifies from the outside of the control panel or enclosure that full electrical isolation exists.
The power alert incorporates redundant circuitry and is powered by the same voltage that it indicates, and so identifies hazardous conditions before access is gained to enclosures.
It also enhances compliance with NFPA and OSHA recommendations on "the control of hazardous energy".
The eight LED indicator/detectors alert the user to dangerous conditions where AC potential occurs between any combination of the four monitored input lines (L1, L2, L3 and earth or GND).
Two LED lights (designated + and -) are assigned to each input line.
For each of these lines carrying an AC potential (bi-polar), both LEDs are illuminated and will flash.
In the event of AC or stored energy potential, the + or - respective LED will be illuminated for the appropriate + or - line.
The operational power range is 40 to 750V AC, 50/60/400Hz for single and three-phase supplies.
DC or stored energy is 30 to 1000V DC.
In all cases line-to-line and line-to-GND leakage conditions are identified.
Power consumption is approximately 1.2W at 750V AC and the LED flash rate/s varies from approximately 1.5 to 9 with the rate increasing as the voltages get higher.
Supplied in NEMA 4X totally encapsulated housings for environmental protection, the UPA devices are supplied with 1.8m terminations and can be fitted to panels between 1.6 and 4.75mm thick with approximately 38mm rear of panel projection.
The operating temperature range is -20C to +55C, with storage conditions being -40C to +85C.
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