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b. Provision to padlock unit disconnect handles in the OFF position with up to three <br />padlocks. <br />c. Mechanical interlock with bypass to prevent opening unit door with disconnect in the <br />ON position, or moving disconnect to the ON position while the unit door is open. <br />d. Mechanical split -type terminal blocks for disconnecting external control wiring. <br />e. Auxiliary contact on unit disconnect to isolate control power when fed from an <br />external source. <br />f. Disconnect operating handles and control devices mounted on the removable units. <br />g. All compartments shall have laminated wiring diagrams fastened to the inside of each <br />compartment door. Compartments containing motor starters shall have laminated <br />wiring diagrams and heater tables fastened to the inside of the compartment door. <br />Compartments containing panelboards shall have circuit directories consisting of two <br />ply laminated plastic, with black face and white core fastened to the inside of the <br />compartment door. <br />D. Bus Systems <br />1. Main horizontal bus: Tin plated copper, bolted joints, accessible from the front of the <br />structure, fully rated throughout the lineup. <br />2. Vertical section bus: Tin plated copper, full height, totally insulated and isolated by glass <br />polyester barriers with shutters to cover stab openings when units are withdrawn. Provide <br />fishtape barriers to isolate bottom wireways from lower ends of vertical bus. <br />3. Vertical buses used for a tie circuit breaker or tie feeder lugs shall be rated for a <br />continuous capacity equivalent to the main horizontal bus rating. <br />4. Horizontal ground bus: Provide a 1/4 -inch by 2 -inch (minimum) tin plated copper <br />uninsulated ground bus in each section equipped with lugs for termination of feeder and <br />branch circuit ground conductors. Connect to ground bus in adjacent sections with splice <br />plates. <br />5. The buses shall be sized for a maximum current density of 1200 Amps per square inch. <br />E. Wiring <br />1, Wiring: Stranded copper, minimum size No. 14 AWG, with 600 Volt, 90 degree C, flame <br />retardant, Type MTW thermoplastic insulation, NEMA Class U -S, Type B. Line side <br />power wiring shall be sized for the full rating or frame size of the connected device. <br />2. Identification: All wiring shall be numbered with type written heat shrinkable type wire <br />markers at each termination point, color coding per NEMA Standards and the NEC. <br />Foreign voltage control wiring shall be yellow. <br />044572017 <br />16480-3 <br />