electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
- Occupation
- Electrician
I have recently started doing a number of 480 wye services, feeders, and panelboards and have discovered that when requesting equipment quotes, I get asked for the aic rating. I have read up on the topic and know what it is, but I am unclear on in the real world, how many calculations are typically done when running 480 services and feeders and how this is usually handled for smaller non-engineered jobs? Is it like load calcs for single family dwellings in that nobody does them for routine jobs? A few examples of the type of projects I am referring to: 1) Say you are doing a 400 amp 277/480 service. Do you ask the utility for their asc? Every time or only if the AHJ asks for it? Does most service equipment in this category cover most situations? 2) Say you are running a 100 amp 277/480 feeder to a panel board in a machine shop. What should the AIC rating be? To what extent to you go to figure it out or do you just spend a bit more on the equipment to make sure you are covered? Appreciate any feedback on how others handle this situation.