Overview of the insulate and isolate technique for distribution lines
The insulate and isolate (I&I) technique for the live line tool method on distribution lines requires an effective use of equipment and procedures to provide the necessary level of safety when performing live line work on energized lines and equipment. Insulating protective equipment (IPE) and insulating personal protective equipment (IPPE) are used to protect the lineworker while working on or within 5 feet (including extended reach) of energized lines and equipment. IPPE includes rubber gloves and sleeves, whereas IPE includes blankets, line hoses, hoods, plastic covers, etc. The isolation technique is used to physically separate the employee, both mechanically and electrically, from all sources of energy.
- Minimum approach distances (MAD) set forth by 29 CFR 1910.269 must be followed.
- All employees using this method will be trained in and familiar with safety-related work practices, procedures and other safety requirements that pertain to their respective job assignments.
- Before getting into a working position, the approved and properly rated I&I shall be used on the energized conductors and other conductive parts at a different potential.
- Employees should apply IPE and IPPE to prevent accidental/inadvertent contact with any conductive object within their extended reach that could have a difference of potential and would allow current to pass through the body.
- Any time an employee’s unprotected hands or arms are positioned within the MAD of exposed energized lines or equipment, appropriately rated rubber gloves and sleeves shall be worn, or effective cover shall be applied.
- Approved insulating equipment will be installed in the order of “nearest first” and removed in reverse order.
Benefits
- This best practice reduces electrical contact injuries and fatalities and eliminates electrical arc flash injuries for a safer work environment while maintaining the reliability of the electrical system.
- Eliminate contact injuries.
- Eliminate electric arc flash injuries.
- Safely working on energized circuits and maintaining the reliability of the electrical system.
Questions
- Does MAD apply when using a live line tool?
- What voltage separates distribution voltage from transmission voltage?
- I am performing hot stick work and need to encroach MAD and perform a task by hand. What position do I need to be in to don my rubber insulating gloves and sleeves?
Source: Powerlinesafety.org
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