commercial electrical load calculation spreadsheet

Some types are load are not permitted to have diversity to be applied such as electric heaters and showers because it is either on or off. In commercial building code requirements, we need only includes cookies that enough. If the service supplying the building is 480Y/277V, 3-phase, this adds a total of about 1,260A of capacity to the required electrical supply for the building. If it does it purely in amps you could use a single phase calculator because the results are the same. When sizing as a load calculation it is fairly straight forward. Each of power as an approved by a look around any commercial electrical load calculation spreadsheet from air infiltration below the npshr and computers should also be used for calculation, excel to offer the. In the 2017 NEC, the lighting load would be calculated at 300,000 ft2 × 3.5VA/ft2 for a total load of 1,050,000VA on the service. The big problem with three phase is that in commercial you will have to keep track of 3 single phase loads and in industrial motors drive everything. The first 10 Amps + 30% of the remaining load so, 10 Amps + 7.43 Amps = Total (after diversity) 17.43 Amps.ĭiversity can be applied to a cooker as it is very unlikely that the oven, grill and all 4 hob rings are going to be heating all at the same time, once the oven or hob ring has reached its target temperature then it will switch itself off until the temperature drops. Commercial Electrical Load Calculation Spreadsheet. It is also worth considering the life span of the electrical installation as should the way the installation is used change then the diversity factors applied previously may no longer be relevant.Īs a very basic example to calculate diversity for a cooker in a dwelling, based on Appendix A of the OSG:

Calculating diversity is not an exact science since there are multiple varying factors which must be considered when calculating diversity and maximum demand, these factors will vary from premises to premises. There are many ways to apply different electrical diversity factors to different types of electrical loads, fixed equipment or electrical circuits.

Commercial electrical load calculation spreadsheet