There are several different types of electrical power wiring requirements within the industry. Among those are power for buildings and process control. Buildings are supplied power to accommodate the building power load. There are specific load calculations that are required to determine the total building load. There are factors that can increase or decrease the calculated load based on demand factors or the type of load being served. It is important to know the code requirements so a cost effective service is provided to supply current and future needs. Building power systems need to be built with the use of the building in mind. Backup power systems may be needed. Special power conditioning equipment and surge suppression may be required for computer systems. Process and communication systems have very specific requirements. It is important to know the type and size of power supply systems for process control and communications.