I work in the IT industry. I am working on a new building design. The engineers have a meeting to discuss the various low voltage and high voltage systems for the new building.
What is the difference between low and high voltage systems and what building systems would fall under each category?
voltage level will depend on your requirement, and available voltage level in the premises. In industrial power systems, it is common to have at least two voltage level in the same building. In the Philippines, we have 230V (single-phase) for the utilization voltage. If you have relatively large motor loads, perhaps you will need 460V(3-phase) system to feed the 440V motors, ACU, blowers, etc.
Both 230V and 460V are still considered LOW VOLTAGE (up to 600V). Generally, voltages 1,000V and up are HIGH VOLTAGE. However, Medium voltage has been generally used to classify intermediate voltages, with reference to the "hundred-kilovolts" class.
So again, voltage level will depend on your load requirements, and the existing power system where you will inter-connect your new building (I am assuming the new building will be located within your company's premises). If it's not, you have to contact the local distribution company to inquire about their voltage allocations.