champion
Member
- Location
- St. Louis Missouri, US
First I would like to say that this website is a wonderful vehicle for help in obtaining information. The knowledge and people who have assisted my silly questions are indeed respected.
I have worked toward licensing myself in the state in which I reside. I have been so far limited to working residential dwellings.
I have an oportunity to do my first design of a small commercial building and feel pretty comfortable about all the calculations involved in this process as well as designing the circuits required and servce size. It is not an easy task and have gained alot of respect for those who know.
The owner is someone I know and has given me the oportunity to get my feet wet in this process.
Since I have not really had much practical experience in providing AC power from a 3ph 120/208v system, two question arose regarding this project,
1) CONDUCTOR IDENTIFICATION.
2) AIC ratings. (determining disconnect and brkr criteria)
For example---Ref. Article 310.12c ---If I want to run three 120v lighting ckts in one conduit and junction these ckts to various locations, can I use black, red, and blue, hot lead conductors for identification purposes regardless of which leg the 120v ckts are tied to and use gray and white leads for associated neutrals? The reason for this question is stricly to assist in the identification of these leads within boxes, etc. in the downstream end of the conduits.
AIC----To find the short circuit current available at the utility for determining the AIC rating of the main disconnect and service panel, would I be required to obtain this information from the utility company or is there something else I need do?
When It comes to providing the main load center for this building there are may types of load centers available, such as CUTLER HAMMER BR type
CH etc. Is there a industry or document standard that describes what BR, CH etc. stand for or is this just a manufactures type letter ID?
Thank you in advance for your responses.
I have worked toward licensing myself in the state in which I reside. I have been so far limited to working residential dwellings.
I have an oportunity to do my first design of a small commercial building and feel pretty comfortable about all the calculations involved in this process as well as designing the circuits required and servce size. It is not an easy task and have gained alot of respect for those who know.
The owner is someone I know and has given me the oportunity to get my feet wet in this process.
Since I have not really had much practical experience in providing AC power from a 3ph 120/208v system, two question arose regarding this project,
1) CONDUCTOR IDENTIFICATION.
2) AIC ratings. (determining disconnect and brkr criteria)
For example---Ref. Article 310.12c ---If I want to run three 120v lighting ckts in one conduit and junction these ckts to various locations, can I use black, red, and blue, hot lead conductors for identification purposes regardless of which leg the 120v ckts are tied to and use gray and white leads for associated neutrals? The reason for this question is stricly to assist in the identification of these leads within boxes, etc. in the downstream end of the conduits.
AIC----To find the short circuit current available at the utility for determining the AIC rating of the main disconnect and service panel, would I be required to obtain this information from the utility company or is there something else I need do?
When It comes to providing the main load center for this building there are may types of load centers available, such as CUTLER HAMMER BR type
CH etc. Is there a industry or document standard that describes what BR, CH etc. stand for or is this just a manufactures type letter ID?
Thank you in advance for your responses.
