I work in San Francisco and from what I understand many buildings were originally designed before the redundancy power-grid was put into effect by the utility. The power-grid uses multiple large transformers in parallel which directly increases the available fault current. So now we have a bunch of buildings with low-resistance busducts distributing power up through the core and a bunch of insufficiently rated panelboards and overcurrent protective devices. Now I have two questions:
A) Can an Arc-Flash analysis be properly calculated if these devices aren't rated to handle a full fault?
B) How do people genrally feel about underrated devices?
Thanks
Fist
A) Can an Arc-Flash analysis be properly calculated if these devices aren't rated to handle a full fault?
B) How do people genrally feel about underrated devices?
Thanks
Fist