I'm not sure that this is the appropriate place, BUT here goes... I am about to review induction lighting fixtures versus using HPS fixtures for roadway lighting. There are a lot of pros for using them: high CRI, longevity, etc., however, I am hesitant on making a decision as far as...
I've recently experienced electric motor startup problems like high thermal temps. for motors 150hp and larger that drive well pumps. I've never had to look into the realm of sub-freezing temps creating a larger current draw on startups as I live in a milder region of the country. I would...
I have run across Anthony Pansini's text and it gives recommended loading for distribution transformers. I believe that some of the recommended kVA ratings seem high. (Just my opinion) For example loading a 167kVA padmount transformer for up to 370kVA load under Table 6-13. I understand that...
Can anyone refer me to a basic Total Ownership Cost (TOC) evaluation method for transformer purchasing for utilities? I am reviewing our method and it does not seem appropriate.
Thanks!
I have a contractor that wants to mount a instantaneous gas water heater 15" away from an electric meterbase. Our requirement mentions a gas "meter" to be 3' away from the meterbase, but does not mention gas appliances.
I am looking for a standard that mentions a clearance for gas appliances...
1. In regards to pulling tension calcs, I am trying to determine the jam ratio pulling 4 cables through 6" conduit.
Cables used are:
3-750kcmil diameter:1.73 per cable
1-4/0kcmil diameter:.98 per cable
I am using the following formula:
Ratio= 3D/n1d1+n2d2
Where D=inner diameter of conduit...
I'd appreciate it for some feedback/explanation of the following occurance...
Presently there is a 3 phase 4 wire Y feeding a new subdivision at the end of the line with phase "a" and "c". On the way to the subdivision, there is a pump station with a 120/208 service that is radial fed. Before...
I am in a debate concerning fusing for a distribution system as far as wire and padmount transformers are concerned. There are two schools of thought here. One says to fuse to protect the wire and rely on the bayonet fuses within the padmount transformer, the other says to fuse to protect...
I am able to calculate secondary fault currents based on an infinite bus, but unable to calculate a sec. fault current with the provided primary fault current. Please lead me in the correct direction.
