Section 408.11283. Portable welding guns.

(1) Unless the design  makes  it  unnecessary,  a  portable welding gun shall be counterbalanced including the cables.

(2)   All suspended portable welding gun  equipment,   except  the  gun assembly, shall be equipped with a safety chain  or  cable   capable  of supporting the total shock load in event of failure of  any  component  of the supporting system.

(3)   When a trolley is used to support a portable welding machine with a clevis for attachment to a safety chain, the clevis shall be wrought or forged steel and capable of supporting the shock load in event of failure of the trolley.

(4)   The movable holder shall have such clearance where it  enters   the welding gun frame that a shear action cannot take place if the operator's fingers are placed on the operating movable holder or   guarding   shall   be provided.

(5)   The secondary and case of a portable welding  transformer  shall   be grounded by a center tapped secondary or by a  center  tapped  grounding reactor connected across the secondary.

History: 1979 AC.