25-REHABILITATION OF THE EAST ELEVATED STORAGE TANK

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SSPC-Guide 12 June 1, 1998 Editorial Revisions November 1, 2004 7.1 ALL LOCATIONS 7.1.1 All lighting equipment must be durable and designed for the intended work environment. 7.1.2 Portable lamps and fixtures should be encased in a nonconductive, shatterproof material, which serves as an electrical insulator providing additional protection from elec- trical shock, abrasion, and corrosion resistance. Lamps and fixtures should also be equipped with substantial guards to prevent contact with personnel, containment materials, etc. 7.1.3 Use only heavily insulated cable with an abrasive resistant casing, at least gage 14/2 SO AWG or heavier and designed for hard or extra-hard usage, per NFPA 70 (e.g., types S, ST, SO, STO). into the specific electrical line supplying the power to the light fixture. 8. Proper Use and Maintenance of Lighting Equipment 8.1 LIGHTING FIXTURES 8.1.1 All lighting systems should be removed from the direct spray of paint, abrasives, or other materials. Impacts of air flow patterns from any ventilation system in operation should also beconsidered. Paint overspray with accumulations on fixtures reduces the amount of light emitted and restricts heat dispersement of the light, which may cause premature failure or overheating. 7.1.4 Use of white light is recommended, as it is closest to natural light. White light does not visually distort the surface being worked on or being inspected. Lighting equipment capable of providing white light should be selected for task specific lighting where practical. 7.2 NONHAZARDOUS, WET LOCATIONS: All lighting fixtures having an electrical supply service greaterthan 12 volts must be properly grounded, have ground fault circuit interrupter (GFCI) protection, or have an integrated circuit breaker wired 8.1.2 Do not tape over the lens or cover areas designed for heat dispersement, as this may cause severe damage to the fixture and significantly reduces bulb life. 8.1.3 Do not drop or drag lighting fixtures. 8.2 POWER CORDS AND CONNECTORS 8.2.1 Periodically inspect GFCis, plugs, integrated circuit breakers, and power cords, as well as all power cord connections. TABLE 1 WORK AREA ILLUMINATION REGIUIRMENTS IN FOOT CANDLES' Minimum Recommended General Work Area2 10 20 Task specific - surtace preparation and coating application3 20 50 Task specific - inspection 50 200 Based upon levels of illumination recommended for sample occupational tasks in ANSI/IES RP 7. The level of illumination throughout a work area, measured at various locations on the horizontal work-plane, at least 6 feet (2 m) from the nearest light sources. (See Section 6.1). An illumination level of 20 foot candles is recommended for corridors, scaffolds, and other walking surfaces. The level of illumination for pertorming specific visual tasks (i.e., surface preparation, coating application, and inspection) measured at the work surface in conjunction with the intended light source (See Section 6.1) TABLE 2 MAXIMUM LUMINANCE RATIOS' Between task and adjacent darker surroundings2 Between task and adjacent lighter surroundings 5 to 13 1 to 5 ' Maximum luminance ratios recommended are based upon areas (indoor or outdoor) where it is completely impractical to control reflectances and difficult to alter environmental conditions. 2 The eyes function more efticientlly and comfortably when the illumination levels within the work environments are not too different from those of the seeing task. 3 Based upon maximum luminance ratios trom ANSI/IES RP 7 52 9-49