Coordination and arc flash studies estimated values
Coordination and arc flash studies estimated values
(OP)
Hello everyone,
I have been doing coordination and arc flash studies for low voltage commercial and industrial distribution systems. So far, I have had no problems in acquiring the necessary information to do the studies (grid MVA, X/R, line voltage, R0/1/2, X0/1/2). However, I have come across a project where the utility will not provide the information I require no matter how many ways I ask. Has anyone experiences this, and if so, how do you go about circumventing this? Would it be appropriate to estimate values based on info I may find in the buff book? This is the only option I can think of.
Thanks
I have been doing coordination and arc flash studies for low voltage commercial and industrial distribution systems. So far, I have had no problems in acquiring the necessary information to do the studies (grid MVA, X/R, line voltage, R0/1/2, X0/1/2). However, I have come across a project where the utility will not provide the information I require no matter how many ways I ask. Has anyone experiences this, and if so, how do you go about circumventing this? Would it be appropriate to estimate values based on info I may find in the buff book? This is the only option I can think of.
Thanks






RE: Coordination and arc flash studies estimated values
EE
RE: Coordination and arc flash studies estimated values
Thanks again
RE: Coordination and arc flash studies estimated values
I haven't checked the numbers, but my gut feeling is your error in estimating X/R will be in the same range as the error in estimating only the maximum fault current.
RE: Coordination and arc flash studies estimated values
I would be more concerned about getting the actual impedance of the utility service transformer.
RE: Coordination and arc flash studies estimated values
RE: Coordination and arc flash studies estimated values