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10121 Removal of Contents - Confined spaces must be clean, free of hazardous <br /> materials or chemicals, and where necessary, purged by water or other equivalent means <br /> 10122 Isolation - All piping or utility lines which discharge into or connect to the <br /> confined space shall be disconnected and capped or isolated The use of a single in-line <br /> valve shutoff as the sole means of isolating the confined space from any input lines is <br /> prohibited However, the use of a double in-line valving arrangement with a vent in between <br /> the two valves is acceptable provided that dangerous air contaminants are not introduced by <br /> such venting Utility services (e g , electricity for lighting) to the confined space provided by <br /> way of systems specifically designed to operate safely when the space is entered, and which <br /> have been properly maintained and that are undamaged, may be permitted if a greater <br /> hazard would be created by cutting them off <br /> lie 10123 Electrical Lockout - Where electrical devices located within the confined <br /> space (motors, switches, etc) are to be repaired or worked on, the line disconnect switches <br /> supplying the power must be tagged and locked in the "OFF" position The lock key is to <br /> be kept by the person performing the fob, and only this person is authorized to unlock the <br /> switch and remove the tag upon completion of the fob Where more than one person is <br /> working on the line each must place a lock on the switch and retain his own key <br /> Line disconnect switches supplying power to any mechanical apparatus that normally <br /> operates in the confined space (mining machines, conveyors, etc) must also be tagged and <br /> locked in the "OFF" position This must be done for any entry, even though work will not <br /> be performed on the apparatus itself <br /> 10-3 REV 4/92-EGI <br /> AMIN <br /> c <br />