1. (a)

   1. (1) Electrical distribution systems shall be designed to allow rapid comprehension of the basic system layout.
   2. (2) Where multiple voltages will occur within a space or structure, careful consideration should be given to the layout, routing, labeling, and color coding of conductors and components to minimize potential injuries due to confusion of the various systems.
2. (b) Where three-phase power is available, utilize this power for larger motor loads.

3. (c)

   1. (1) The use of copper conductors and copper busses is recommended.
   2. (2) Where aluminum conductors are to be considered, the Building Authority Division recommends that aluminum not be used on branch circuits below the distribution panel level.
   3. (3) The division recommends that all terminations on aluminum conductors be made with bolt-on or weld-on lugs only.
   4. (4) Panel board termination bars or lugs utilized with aluminum conductors should be made of copper, cadmium, or other approved materials rated for use with aluminum or copper.
4. (d) Where buildings are provided with a four hundred eighty/two hundred eight/one hundred twenty (480/208/120) volt system, perform an economic analysis of the cost benefit of two hundred seventy-seven (277) volt lighting versus one hundred twenty (120) volt lighting.
5. (e) Specify lighting fixtures, lamps, and ballast for energy efficiency and to minimize the amount of hazardous waste that may be generated by the department during routine maintenance replacement.

6. (f)

   1. (1) Specify high-efficiency transformers when the transformer losses are included in the utility metering.
   2. (2) Utilize transformers that are operationally stable at the anticipated operating conditions.

7. (g)

   1. (1) Where critical operations include electronic equipment or computers, utilize transformers that minimize harmonic distortion or provide electrical isolation of susceptible equipment or circuits.
   2. (2) Provide neutral conductors sized for two hundred percent (200%) of the line conductor capacity.

8. (h)

   1. (1) Provide a minimum of ten-percent spare circuit capacity at each panel to allow future growth.
   2. (2) Provide a minimum of twenty-five-percent growth capacity on wire management systems for each system’s future growth.
9. (i) Circuits serving critical loads or equipment should be provided with a minimum ride through capability to allow continuous operation of the equipment or component during nominal dips in power to seventy percent (70%) of RMS voltage and for momentary outages of one-half (1/2) cycle or less.
10. (j) All new construction shall be evaluated for lightning risk hazard in accordance with the procedures outlined in NFPA 780.

Codification Notes: "NFPA" means National Fire Protection Association. "RMS" means root mean square.