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Thread: Wiring new shed

  1. #1
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    Default Wiring new shed

    Just finished a new 8x8m shed. Looking to run a 3hp Minimax sc2c, 3hp dusty plus usual smaller 10amp stuff. May add 3hp jointer/planer later. Minimax recommends 4mm wiring to cover for warranty. Thinking of getting one dedicated circuit of 4mm (not sure is that 20amp?) for the Minimax, one dedicated 15 amp of 2.5mm for the dusty, one circuit of 2.5mm for 10amp plugs, and one light circuit. Hoping this setup would cover for any future additions. One leccy said it was overkill but others whose opinions i also respect think it would give me good coverage. I would prefer to be over- rather than under-engineered. Don't forsee any additions above 3hp. Any input/thoughts would be appreciated. Shane.

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  3. #2
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    Quote Originally Posted by Surfmore View Post
    Just finished a new 8x8m shed. Looking to run a 3hp Minimax sc2c, 3hp dusty plus usual smaller 10amp stuff. May add 3hp jointer/planer later. Minimax recommends 4mm wiring to cover for warranty. Thinking of getting one dedicated circuit of 4mm (not sure is that 20amp?) for the Minimax, one dedicated 15 amp of 2.5mm for the dusty, one circuit of 2.5mm for 10amp plugs, and one light circuit. Hoping this setup would cover for any future additions. One leccy said it was overkill but others whose opinions i also respect think it would give me good coverage. I would prefer to be over- rather than under-engineered. Don't forsee any additions above 3hp. Any input/thoughts would be appreciated. Shane.
    Shane in a 8*4 shed, I have 2*10amp, 1*15amp, 1*20amp power circuits and 2 light circuits. These are all tied back to the shed circuit breaker box, then 6mm to the house.

    The 15amp circuit is to a 15amp gpo for the Bandsaw/Spindle Moulder/Thicknesser and the 20amp is dedicated to my lathe.
    Pat
    Work is a necessary evil to be avoided. Mark Twain

  4. #3
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    Don't use the sparky who said that was overkill. He obviously doesn't understand the current draw that will be coming from your shed when full up and running. When doing shed installs, I always recommend installing a couple of extra 15A outlets on opposing walls of the shed. There will always be a machine that needs a 15A outlet somewhere down the line and its cheaper to install during the original rough-in rather than later.

  5. #4
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    I have 5 x 15A outlets, 2 x 10A circuits (17 double GPOs) and a separate 10A lighting circuit

    The 15A are all dedicated double GPOs
    DC
    Welder/Plasma cutter
    TS
    BS
    Compressor
    AC/Spare

    Most of the double GPOs have a multi outlet adaptor attached to them so that everything; chargers, monitors, machines, most regularly used corded power tools, spots, etc are already plugged in
    The reason for this is because I believe constantly swapping around Plugs and having cables all over the floor comes with some risk, in a hurry and you'll forget which is on/off etc.

    Pintek has it right - install a couple of extras on opposite walls even if you don't need them.

    Also look at installing the wiring in a cable tray at the top of the walls with conduit drop downs - that way they can easy be reconfigured later without having to get at wiring behind lining or stuff up against the walls.

  6. #5
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    Thank you for sharing those informed thoughts. That has helped heaps in clarifying what I need to do. You guys are a great resource. Shane.

  7. #6
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    If you are trenching to carry the power in conduit make the conduit bigger than you need and leave at least one draw wire in it for when you need more power. I would put two conduits in, one for power and a smaller one for data.
    CHRIS

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    What do you have planed for your D/E and Air compressor? I have mine in a separate room with remote switches located on the wall mid way down the shed.
    I try and do new things twice.. the first time to see if I can do it.. the second time to see if I like it
    Kev

  9. #8
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    We live on an old banana farm so DC goes from cyclone to dusty then out the door. No neighbours. Compressor is in another shed. Love the idea of remote or automated switching for the dusty but i'm pretty low-tech and couldn't find anything nice and simple. I'd appreciate any recommendations. Thanks for taking the time to help out.

  10. #9
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    Hi Surfmore, When we moved into our current place last year I had 2 20amp flat pin outlets put in , 1 on each side of the shed. I've now got 3 machines all with 20amp plugs so this provides the flexibility needed. This was only possible as the shed already had a 10mm line running to it .
    If going to the expense of this now may as well build in some flexibility for the future ( 20amp flat pin outlets can accept 15 and 10amp plugs ).

  11. #10
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    Some great advice above.

    You cannot foresee the future, so your aim is flexibility. The extra cost of doing more wiring now is much less than calling back a sparky in the future.

    As Bob says all powerpoints should be doubles. You can never have too many!

    Powerpoint placement is important:
    • you might want to put benches or cabinets or workstations against any wall - a powerpoint lower than one metre will get in the way.
    • you might want to hang cupboards or wall racks on the walls. Bottoms might be at 1.2 or 1.3 metres - you want the powerpoints below this.


    You will want to add or change the ceiling lighting, so I suggest that lights be wired to sockets rather than hardwired => flexibility.

    The cost differential between 4 mm and 6 mm wire is irrelevant when compared to the sparky's wages. Over-engineer.

  12. #11
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    Quote Originally Posted by GraemeCook View Post
    Powerpoint placement is important:
    • you might want to put benches or cabinets or workstations against any wall - a powerpoint lower than one metre will get in the way.
    • you might want to hang cupboards or wall racks on the walls. Bottoms might be at 1.2 or 1.3 metres - you want the powerpoints below this. .


    Another one to watch out for is sheet goods leant up against a wall. A 2.4 x 1.2 on its side means you want the GPO above the 1.2.m mark.
    This is why putting them on conduits outside the shed lining makes them easier to (re)move, change etc.

  13. #12
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    Put all lights on three pin plugs and put too many plugs in so when you get old and your eyesight goes walkabout you can add light simply by plugging more lights in.
    CHRIS

  14. #13
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    Quote Originally Posted by Chris Parks View Post
    Put all lights on three pin plugs and put too many plugs in so when you get old and your eyesight goes walkabout you can add light simply by plugging more lights in.
    Each light plug should go into its own double socket - gives 100% redundancy - pus a spare (or two) double sockets.

  15. #14
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    Quote Originally Posted by GraemeCook View Post
    Each light plug should go into its own double socket - gives 100% redundancy - pus a spare (or two) double sockets.
    Or if you use single outlet GPOs and make sure you use a piggy back plug on each light.

  16. #15
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    Quote Originally Posted by BobL View Post
    Or if you use single outlet GPOs and make sure you use a piggy back plug on each light.
    Minor disagreement, Bob. At the planning stage its better to build in the flexibility - very lettle difference in costs between a single and double surface mounted socket.

    Eight piggy back plugs in a gang is probably not a good idea!

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