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LOCK OUT TAG OUT VERIFICATION FACILITATION

IP.com Disclosure Number: IPCOM000235905D
Publication Date: 2014-Mar-28
Document File: 3 page(s) / 77K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique for reducing risk to shock and burn during maintenance work for equipments. By combining low current intrusions characteristics with properly spaced hand placement, personal protective equipment (PPE) requirements are reduced to nominal levels. Further, an enclosure design is used which is sufficiently spaced to allow limited access at potentially energized equipment with sufficient opaque to arc burn exposure. The enclosure design reduces requirement for bulky PPE when alternative is to allow unimpeded exposure to potentially live buss while completing LOTO verification steps.

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LOCK OUT TAG OUT VERIFICATION FACILITATION

BACKGROUND

The present invention generally relates to switch mode power supply and more particularly to a technique for reducing risk to shock and burn while maintenance of equipments.

Switch mode power supply provides risk to shock and burn while maintenance or other activities require human presence in proximity to potential live busses. A well-established technique addressing risk is to lock out and tag out (LOTO) equipment prior to commencement of maintenance work. However, the technique is economically feasible when LOTO is completed prior to commencement of maintenance work and proximity of human to potentially live busses is not necessary to complete the LOTO. However, the technique presents an additional cost as well as an unanticipated additional procedure beyond ability to readily ignore.

A conventional technique offers an access port that includes a leaded wire to a feeder. The technique eliminates requirement for small leaded wires. Failure occurs by using small wires as the small wires are not rated for fault current of upstream protective device. However, the technique does not reduce risk to shock and burn during maintenance.

Therefore, there is a need in the art for a technique to reduce risk of shock and burn during maintenance work.

 

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 depicts technique to facilitate voltage verification of internal bus voltages.

DETAILED DESCRIPTION

The invention proposes a technique for reducing risk to shock and burn during maintenance work for equipments. High voltage alternating current (AC) or direct current (DC) measuring devices extend simple voltage measurement capability to 20 kilovolts (kV). By combining low current intrusions characteristics with properly spaced hand placement, personal protective equipment (PPE) requirements are reduced to nominal levels. Further, an enclosure design is used which is sufficiently spaced to allow limited access at potentially energized equipment with sufficient opaque to arc burn exposure. The enclosure design reduces requirement for bulky PPE when alternative is to allow unimpeded exposure to potentially live buss while completing LOTO verification steps.

Figure 1 depicts technique to facilitate voltage verification of internal bus voltages.

Figure 1

As illustrated in the above figure, the enclosure design requires combination of feature which guides probe to buss. Such feature provides attenuation primarily through aperture control while closing access energized conditions.

The technique allows lowering down of PPE requirement to verify zero voltage during LOTO process. The technique commercially reduces service time to LOTO equipment. The technique eliminates hazards of removing panels to access the buss to be verified to have zero voltage.

ABSTRACT

The invention proposes a technique for reducing risk to shock and burn during maintenance work for equipments. By combining low current intrusions characteristics...