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Need to price for running a sub main 300m from a generating plant back to house and workshops. 3 phase will be brought back to the buildings near the house where the mains supply for the house comes in.. Here's the problem..
At the moment the house is on single phase. Bringing the 3 phase cable from the generating plant to the house and fitting new 3 phase DB and making the house a 3 ph installation is certainly the best way to go to keep things balanced. However there is a chance the customer may want to bring the 3 phase up and then only use one phase for the house keeping the existing house DB, the other 2 phases being used around the other buildings.
calculating the volt drop on the cable should I be using 230V figures if the house is split off to be single phase only? And hence 3% for lighting of 6.9V rather than 12V.
It's bit of a complicated set up and difficult to explain but hopefully that kinda makes sense!
Edit. Thinking about it the house circuits are 230V anyway even if 3 phase is at the house so therefore everything should be worked out on 230V, right?
At the moment the house is on single phase. Bringing the 3 phase cable from the generating plant to the house and fitting new 3 phase DB and making the house a 3 ph installation is certainly the best way to go to keep things balanced. However there is a chance the customer may want to bring the 3 phase up and then only use one phase for the house keeping the existing house DB, the other 2 phases being used around the other buildings.
calculating the volt drop on the cable should I be using 230V figures if the house is split off to be single phase only? And hence 3% for lighting of 6.9V rather than 12V.
It's bit of a complicated set up and difficult to explain but hopefully that kinda makes sense!
Edit. Thinking about it the house circuits are 230V anyway even if 3 phase is at the house so therefore everything should be worked out on 230V, right?