Power to the People, part 2

I will give a better tour of the shed, and the electrical layout in the near future, but in the meantime – here is a sneak peek.

Photo 25-01-2014 17 49 21Power is entering the shed from under the slab (through a conduit I put in place during the slab pour).  It is coming from a 63A breaker on the main switchboard, to a second 63A breaker on this panel located near the roller door.  There are a number of circuits running off this, including lighting circuits, multiple 10A circuits (5 or 6?), 15A circuits (3). When the electrician comes back after the long weekend, I will get a run down of each circuit and breaker.

Photo 25-01-2014 17 49 29Some of the conduit running away from the switchboard and off around the shed.  All wires potentially susceptible to damage are encased in conduit to protect it.  That is to stop any being damaged, and then causing the metal shed becoming live.

Photo 25-01-2014 17 49 50 Photo 25-01-2014 18 18 20The lighting circuits run to GPOs at each lighting position.  As these light tubes are wired with a standard 10A plug, this makes it very easy to connect the lights, and unplug and remove (and replace) any that ever become faulty.

If you look closely, you’ll notice a GPO on the main cross-beam in the second picture…..

Photo 25-01-2014 17 50 05This is specifically placed here, as it is for the roof-mounted air filtration unit.

Photo 25-01-2014 17 49 39

Then, there is power all around the perimeter (and on the one support post), all double GPOs. You’ll notice the wood trim all round.  This is an alternate to running conduit everywhere, as instead the power is run inside the top hats, and then this is faced with the pine.  I chose skirting board for this – Masters had it on special and it was exactly what I was looking for.  Rounded top face, exactly the right width.  It is screwed in place, so very easy to remove for access to the wiring if ever needed (installing additional points for example?!!!?)  I also chose it because it looked a bit classier than just MDF.  It is raw, so I can always apply a finish if I feel so inspired.

Photo 25-01-2014 17 53 07

In the back corner where the lathe will go, you’ll notice an additional switch in between the two GPOs.  This is an additional isolating switch for the external GPOs on the rear corner of the shed.

Photo 25-01-2014 17 53 25

These are installed to allow an air compressor (and lights) to be plugged in from another shed, so I don’t have to put up with the noise of an air compressor in the main shed.  The isolator switch means I can turn off the air compressor at the end of a session from the main workshop, without having to go out to the other shed.

So that is a bit of an overview.  As machines are rolled in, the number of GPOs becomes better explained, as there are a lot of machines to plug in, without having to resort to power boards and extension cords.

Power to the People

So the electricians came today (and are back again tomorrow to finish off).  Had quite a discussion with him about what he had thought, and what I was looking at, and we came up with the following.

Perhaps a bit of overkill, but you cannot have too many outlets.  Not that you plan to use them all, but that gives the most flexibility.

This is where we have gone to far (and although it looks complicated, it is no where near as noticeable in the shed.  Other than there being power where you’d want it).


So what do we have?  Two double GPOs per wall, between columns.  Two outdoor GPOs.  3x single 15A GPOs (green).  The main section (where the tablesaw is in the image above) has 2 circuits.  This circuit also covers 2x double GPOs on the mezzanine.  Bay 1 (at the back) is another circuit, Bay 2 (near the main entrance door) is another one again.

The lights are on yet another circuit, and there is a dedicated circuit for the dust extractor.

Sum total: 50x10A GPOs, 3x15A GPOs, 15x10A GPOs for lights

Just one missing – I will get a double GPO put on the central column (for the jointer), off the dust extractor circuit. probably.

One thing to be sure of – I am not going to be left wondering if there is enough outlets, or where the nearest spare outlet is!!  Another thing to be sure of, with the number of individual circuits (8), and the 63A supply to the shed, it will be the most robust power supply we can come up with!

Deciding on GPOs

Looking at the shed plans, trying to decide on the distribution of GPOs (power outlets) around the shed.

So far I am getting stupid numbers – like 4 GPOs per pillar, plus 1 each corner of the mezzanine, and each light fitting (and two for air filtration).  Total: 75.  Plus 3 x 15A GPOs and 2 outdoor GPOs.

What would you suggest would be a sensible layout for this shop footprint? (Machine location is very approximate at best)


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