What is the minimum approach distance for an unqualified individual into an area with live exposed electrical conductors?
Limited Approach Boundary – The Limited Approach Boundary (LAB) is identified as the “distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists”. Best practice if for any unqualified person to stay 42” (3′ 6”) or more away from the hazard.
What is the minimum approach distance?
The word is actually an acronym that stands for minimum approach distance, which is the calculated safe working distance that provides worker protection when working on or in the vicinity of energized lines and equipment. As with other articles in this series, we must begin with the hazard.
What is the minimum distance that untrained employees can work around standard distribution systems?
Under Table R-6, the minimum approach distance for a 25 kV system is 2 feet, 4 inches for phase-to-ground exposures, and 2 feet, 7 inches for phase-to-phase exposures.
What is the minimum distance an unqualified worker should be away from overhead power lines?
10 feet away
Workers unqualified to work with electricity, as well as mechanical equipment, should remain at least 10 feet away from overhead power lines. Important: If the voltage is more than 50,000 volts, the clearance requirement increases.
When can an unqualified person enter the limited approach space?
2. Limited approach boundary. The limited approach boundary is the minimum distance from an exposed live component where unqualified personnel may safely stand. No untrained personnel may approach energized parts any closer in this boundary unless under the supervision of a qualified worker and using proper PPE.
What is restricted approach?
The Restricted Approach Boundary (RAB) is the approach limit for qualified persons to exposed, energized electrical components where there is an increased likelihood of electric shock due to electrical arc-over combined with inadvertent movement. Only qualified persons may cross this boundary.
What is the minimum approach distance for 345 kV?
Over 50 kV to 345 kV 10 ft. Over 345 kV to 750 kV 16 ft. Over 750 kV to 1,000 kV 20 ft.
What is an approach distance?
An approach distance is the minimum space from an energised overhead electric line that should be maintained by a person or an object held by or in contact with that person.
What is the minimum approach distance when working around exposed live electrical parts?
| Approach distances for qualified person to alternating current | |
|---|---|
| Voltage Range (Phase to Phase) | Minimum Approach Distance |
| Over 750V, not over 2kV | 1 ft. 6 in. |
| Over 2kV, not over 15kV | 2 feet |
| Over 15kV, not over 37kV | 3 feet |
At what intervals should non GFCI cord sets & receptacles that are not fixed or part of the building or structure be tested?
At intervals not to exceed 3 months, except that cord sets and receptacles which are fixed and not exposed to damage shall be tested at intervals not exceeding 6 months.
What is the minimum approach distance to power lines?
A safe working distance depends on the voltage of the power lines. Always maintain a distance of at least 10 feet from overhead lines and more than 10 feet if the voltage to ground is over 50 kilovolts (50,000 volts). The higher the voltage, the greater the distance that is needed between the lines and the workers.
What is the safe distance from 11kV power lines?
1.2 metres
As per the Indian Electricity Act, buildings should maintain a horizontal distance of 1.2 metres from 11kV lines and 4 metres from 66kV lines.
Can a fixed object be taken within a minimum approach distance?
1 In your scenario, however, because the fixed object is not moving, OSHA does not consider it an object that can be “taken” within a minimum approach distance.
What is the minimum approach distance on a 25 kV system?
Scenario 1: Your utility has established, as a written rule, a minimum approach distance of 4 feet, 0 inches for employee exposure to energized parts on a 25 kV system, regardless of whether that exposure is phase to ground or phase to phase. This distance is greater than the minimum approach distances required by §1910.269, Table R-6.
When must an employer ensure that no employee approaches the switch?
Under paragraph 1910.269 (l) (2), an employer must ensure that no employee approaches or takes any conductive object closer to parts (such as the top portion of the switch) when energized and exposed unless paragraph 1910.269 (l) (2) (i) (See paragraph 1910.269 (l) (3)), (l) (2) (ii) or (l) (2) (iii)) is met.
What is the minimum approach distance for a phase to phase switch?
As specified in Table R-6 of 1910.269 for phase to phase nominal voltages of 46.1 to 72.5 kilovolts, the minimum approach distance when phase to ground exposure is the concern is 3 feet (0.9 m) which is the clearance between the blade side on the bottom and the jaw at the top of the switch.