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Utility Linesman, Jointers and Electrical Contractors rely on Insulating Mats and Covers for their protection during live works. Find more information at balmoralengineering.com/produ.... Class 0, Class 1, Class 2, Class 3, Class 4 to International Standards from 1000 volt through to 36,000 volts. AS 2978 Class A Mats are standard in Australia for low voltage Switchboard Mat applications. Class 0 1000 volt Switchboard Mats are also popular and provide high levels of protection for Switchboard Operators. Working live on Overhead Lines present risks some of which can be reduced through appropriate application of Covers to effectively screen voltage differences between phase to earth or phase to phase.