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® WorleyParsons <br /> resources&energy <br /> Lights will be directed on site so that significant light or glare will not be created. Highly <br /> directional, high-pressure sodium vapor fixtures will be used. <br /> Nighttime backscatter illumination will be avoided by directional shielding of lights and <br /> providing on/off switch at the bottom of the ladders and stairways. All light switches will <br /> be clearly identified. <br /> LV distribution panelboards for lighting and receptacles will be sized to distribute the <br /> capacity of the supplying transformer and will be located near the loads connected to each <br /> panel. Such panels will include a minimum of 20 percent spare breakers and all spaces will <br /> be equipped. Panels will include a main breaker as required by the NEC. All plant lighting <br /> panelboards will be located indoors, to the extent practical. <br /> Distribution transformers will be sized to supply the expected continuous load, with <br /> approximately 20 percent margin for future load growth. The transformers will be air- <br /> cooled, dry type, with a 150° C rise. When it is required that the panelboard and/or <br /> transformer are located outdoors, the panelboard will have a minimum NEMA 3R rating <br /> and the transformer will be equipped with drip shields. <br /> 4.25 Freeze Protection /Electric Heat Tracing <br /> The following paragraphs are intended to serve only as a guideline for defining freeze <br /> protection, heat tracing and insulation of systems that could potentially be damaged by <br /> freezing. Freeze protection methods will consist of the use of self limiting, insulated <br /> electric heating cables for low temperature lines and mineral-insulated (MI) for high <br /> temperature lines, heated "doghouses," insulation, sparging with heated water, etc. <br /> Although pipe or equipment insulation is referenced in Section 3, it will be considered an <br /> integral part of the freeze protection system. <br /> For items located outdoors, the heat tracing system will be provided for freeze protection at <br /> site minimum ambient temperature and weather conditions. Freeze protection will be <br /> provided for all piping systems indoors or outdoors which are subject to freezing during <br /> plant operation and shutdown. Sufficient cable will be provided for all flanges, valves and <br /> piping specialty items to permit maintenance of these items. The heat tracing system will <br /> provide a controlled amount of heat to maintain the temperature above the freezing point, <br /> or, in the case of process protection, maintain proper viscosity, temperature or other <br /> parameters required for process operation. Lines requiring freeze protection normally <br /> include (but will not be limited to) water lines, instrument lines, instrument transmitter <br /> housings, safety showers, eyewash stations, and condensate lines. <br /> Where freeze protection is required on fire protection, the design will be in accordance <br /> with NFPA standards. <br /> Freeze protection will be provided in accordance with the P&IDs for all piping systems, <br /> Lodi Energy Center 3.4- 17 LEC AFC <br /> 071608 Rev.A <br />