Glassware, reflectors, and diffusing louvers that cannot be removed should be cleaned as follows:

Wipe with a moist cloth or sponge, using a solution of synthetic detergent cleaner. When incrustation is not removed by sponging, use No. 0 steel wool to remove dirt film.

Take care to ensure that shreds of steel wool do not touch the pin contacts or get into the lamp socket. Wipe off excess moisture with a clean cloth. Clean fixture holders and stem hangers with a moist sponge or cloth dampened with synthetic detergent cleaner and wipe dry. Enameled, chrome, aluminum, or silver- plated reflecting surfaces that cannot be adequately cleaned and polished should be replaced.

Neglected lamp outages reduce illumination. If burned-out lamps are not promptly replaced, illumination may drop to unsafe foot-candle levels in a short time because of outages alone. In some cases, it may be satisfactory and more economical to clean lamp surfaces and fixture interiors only at the time of relamping. Each activity must determine whether cleaning is to be accomplished by electrical, self-help, or custodial service personnel.

Burned-out lamps are replaced on request. To prevent reduced illumination from lamp outages, do the following:

Instruct employees to report burnouts as they occur.

Replace blackened or discolored lamps, even though they are still burning. Discoloration indicates the lamp is nearing the end of its useful life.

Replace fluorescent lamps as soon as they begin to flicker. A burned - out lamp in a live circuit may cause damage to starter and ballast. Blackening at the ends of the tube adjacent to the base indicates that the lamp is near the end of its useful life.

In general, replace with the same type, wattage, and voltage as that of the lamp removed. If frequent burnouts occur, the voltage rating of the lamps may be too low. Lamps of higher wattage than called for on lighting design plans should not be used.

SCAFFOLDING

As the working level of a structure rises above the reach of crew members on the ground, temporary elevated platforms, called SCAFFOLDING, are erected to support the crew members, their tools, and materials.

There are two types of scaffolding in use today: wood and prefabricated. The wood types include the swinging scaffold, which is supported on the ground. For information concerning the wood type of scaffolding, refer to Builder 3 & 2, volume 1, NAVEDTRA 12520, chapter 4. The prefabricated type is made of metal and is put together in sections as needed. As a CE, you will be working more with the prefabricated type of scaffolding.

This section provides only general information on prefabricated scaffolding. For further details of scaffolding, consult the latest copy of the Code of Federal Regulations (29 CFR 1926).

PREFABRICATED SCAFFOLDING

Several types of patent-independent scaffolding are available for simple and rapid erection, as shown in figure 5-78. The scaffold uprights are braced with

Figure 5-78. - Assembling prefabricated independent-pole scaffolding.