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Old 07-17-2012, 06:39 AM   #16
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325m run of underground power to get 240v at the other end?


Thanks "AllanJ" you the man!!! Cheers

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Old 07-17-2012, 09:12 AM   #17
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325m run of underground power to get 240v at the other end?


For futureproofing, given the effort to dig the trench for the cable or conduit, you might want to install a size of wire to handle the maximum number of watts (translate back to amperes at 480 volts) the transformers can handle.

Don't forget that if you don't have a continuous length of wire and need to splice somewhere in the middle, you need an exposed junction box.
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Old 07-17-2012, 12:25 PM   #18
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325m run of underground power to get 240v at the other end?


The other thing I will add into this posting as well.,

If you going to upstep to 480 volts with two transfomers you will have to treat them as sds plus you will have to bond one leg right after each transfomer unless the second one is 480X120/240 volt set up then bond the centre tap of that second transfomer.

And make sure you mark a warning sign that you have 480 volts in that conduit to warn someone else in case they look at the system.

Merci,
Marc
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Old 07-17-2012, 01:10 PM   #19
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325m run of underground power to get 240v at the other end?


Quote:
Originally Posted by Farmer steve View Post
Tried Solar not efficent for the km I have to run plus The energizer in not Solar equiped
The easy solution to that is to break up the fence into 2-3 sections and use more than one fence charger. But if you insist on using the fence charger you've got already, you would still be better off running it off solar power than burying that much cable. You could install a couple hundred watts of solar panels, a couple car batteries, and an inverter to run the fence charger for way less money than burying a 325m cable.
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Old 07-17-2012, 10:47 PM   #20
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325m run of underground power to get 240v at the other end?


Farmer Steve.
Being a farmer you must be busy, so I'll just give you the summary of the calcs. (Note: one important (yet missing) piece of information is whether you will be using a three-phase, or a single-phase transformer? So, I did the calcs. on both. Note: there are 20 amp calcs., 16amp calcs. and (accademic) 10amp calcs. (In my opinion you ought to use the 20amp calcs.). Here are the results:-
(1). 480v 3-phase 20A PVC cond. (3.8% vdrop = #6 AWG Thwn Cu.) ( Note: you oughtn't incur more than 3% vdrop, but this is close...as been as the load is only going to be 10A, but remember - the potential load is...20A).
(2). 480v 1-phase 20A = 2.8%VDrop = #4AWG Thwn Cu.
(3). 480v 3-ph 16A = 3%VD = #6AWG Thwn Cu.
(4). 480v 1-ph 16A = 2.2%VD = #4AWG Thwn Cu.
(5). 480v 3-ph 10A = 3%VD = #8AWG Thwn Cu.
(6). 480v 1-ph 10A = 2.2%VD = #6AWG Thwn Cu.
Summary: Use either #1, or #2 above.

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