Free from any electrical connection to a source of potential difference and from electrical charge, and not having a potential difference from that of the earth.Any material that is suitable for carrying an electric current.The temperature of an arc-flash can exceed 35,000 #F and cause ignition of clothes and severe burns. An electric current that passes through air between ungrounded conductors or between ungrounded conductors and grounded conductors.The explosive expansion of air and metal in the arc path. The dangers of an arc-blast include high pressures that can knock workers over, rupture eardrums and collapse lungs exceedingly loud sounds that can be greater than 160 decibels and molten metal/shrapnel moving at speeds that can exceed 700 miles per hour.Exclusive control means in the physical possession of the employee, or in arm's reach and in line of sight of the employee, or if the employee has affixed a lockout/tagout device on the plug.
Work on plug and cord-connected electrical equipment if the plug is under the exclusive control of the employee performing the service or maintenance.Normal production operations including lubrication, cleaning, unjamming, adjustments, or tool changes provided that these operations do not require the removal of a safeguard or the exposure of an employee to any hazardous energy.Service or maintenance when employees are not exposed to the unexpected release of hazardous energy.All employees working on a service or maintenance project must agree that an exception condition exists before deciding not to use the lockout/tagout procedure. There are several situations in which the OSHA Lockout/Tagout Standard and the Hampshire College Lockout/Tagout Program do not apply. It shall be used to ensure that equipment or machines are isolated from all potentially hazardous energy, and locked out or tagged out before employees do any servicing or maintenance activities where the unexpected energization, start-up, or release of stored energy could cause injury. This procedure establishes the minimum requirements for the lockout or tagout of energy isolating devices.
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