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7.2.4 Lighting
As the plant will normally operate at night to provide direct supply to the wet markets, lighting is a significant issue.
It is recommended that lighting be standardised on 2 x 36W fluorescent fittings, waterproofed to international standard IP65. Fittings must be fully enclosed and be
smooth shaped to avoid collection of dirt on the top and sides of the unit. A suggested typically acceptable unit is the fully enclosed and sealed Pierlite
PWP236H. The lighting layout is shown in drawing 19. If mounted on the ceiling of a high open roof structure, fittings will not provide
appropriate lighting levels to the work area. It is proposed that groups of fittings a stick of say 4 units be mounted on a stainless steel rectangular tube section and
wired to a single ‘plug in’ power supply connected to a dedicated lighting circuit with a non power circuit plug. These multi light units would be suspended off rail
work steel to provide necessary lighting levels in process areas, generally as set out on the lighting layout drawing provided. Some natural lighting may be provided
during daytime from open wall vents, however, the night operation of the plant makes it dependent on electrical lighting. General lighting levels proposed are 400
lux in process area work zones, and a general minimum lighting level of 200 lux. Separate additional fitting would be required to enhance lighting in inspection areas
to 600 lux measured at the point of inspection. No glass should be included in light fitting housings and units should be readily
disassembled for maintenance. It is suggested that it is easier to disconnect a
‘stick’ of lights for replacement than access to a fixed fitting by ladder or similar in process areas. In low ceiling areas, fixed units, mounted off the ceiling would be
appropriate. For external lighting it is recommended that enclosed halide or sodium units with
low insect attraction colour are used. External lighting should include a separately switched, small group of fittings, that allow illumination of the plant for general
access in non production periods. Light switching should be through a central switch area, possibly the services area
for the slaughter floor and the loadout dock for the remainder of the plant. Regardless of the area a hygienic switchboard installation should be provided. All
conduit connections to internal walls must be offset from the wall with spacer blocks. A general lighting pattern is set out on the lighting layout drawing 19.
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7.2.5 Floors
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