2013 48 Autumn Wiring Matters
According to Rendell high-street multiples and stores are now using cable tray for light fittings, so it becomes a general-purpose highway carrying emergency lighting, fire alarm cables as
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Multiconductor cables rated over 600 volts shall be separated from lower voltage cables by a separate cable tray or a solid fixed barrier. Medium voltage (type MV) and single conductor cables in sizes 1/0 and larger are permitted with some restrictions in industrial establishes where qualified persons service the installation. NEC Article 392 explains cable trays, their components, appropriate wiring methods for cable trays, and instances where they are and are not permitted for use. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require.
