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Old 08-25-2013, 01:51 PM   #1
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Ontario - 20Amp circuit to shed - some underground


Hello. I am in Oshawa, Ontario. I need to run a 20amp circuit to the shed to power the shed lights, tv and ceiling fan and an outside GFI for a pool motor (8A). Here are the details.

- 120' run (Basement panel to shed)
- 85' is outside. (25' underground)
- Want to run conduit along the house wall and deck and then underground to the shed.
Questions:
- is 12/2 large enough?
- What diameter/size conduit?
- PVC (I assume) for the full outside run?
- Need underground/wet wire?
- How deep does the trench need to be?

Anything else?

THANK you....

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Old 08-25-2013, 02:37 PM   #2
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Ontario - 20Amp circuit to shed - some underground


#10 minimum, better to use #8.

Don't know any CEC, can't speak on depth.

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Old 08-25-2013, 02:45 PM   #3
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Ontario - 20Amp circuit to shed - some underground


Under power the shed and you'll regret it and end up doing it over again.
I always run at least a 60 amp. service with 220 volts.
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Old 08-25-2013, 04:17 PM   #4
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Ontario - 20Amp circuit to shed - some underground


In Canada you cannot put lights on a 20 amp circuit. Better to run a 4 wire feeder to the shed with a small sub-panel.
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Old 08-25-2013, 04:23 PM   #5
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Ontario - 20Amp circuit to shed - some underground


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Under power the shed and you'll regret it and end up doing it over again.
I always run at least a 60 amp. service with 220 volts.

I would but it is just a 8x12 playfort in the summer for the kids and a storage shed for the patio furniture in the winter... 20 is plenty. I was going to do 15A but figured 20 is better.
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Old 08-25-2013, 08:36 PM   #6
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Ontario - 20Amp circuit to shed - some underground


Lights on 15 amp circuits only in Ontario.
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Old 08-26-2013, 01:27 PM   #7
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Ontario - 20Amp circuit to shed - some underground


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Lights on 15 amp circuits only in Ontario.
Will do a 15amp. Any comments for the other questions?
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Old 08-26-2013, 01:50 PM   #8
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Ontario - 20Amp circuit to shed - some underground


i would install a 12/3 wire at minimum then if you need more power you can upgrade to a 240V and install small subpanel later for 1 x 15amp for light and outlet and a 20 amp for pool pump
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Old 08-26-2013, 06:22 PM   #9
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Ontario - 20Amp circuit to shed - some underground


Since you have a pool motor there also I would run a 14/3 cable and use a double pole 15 amp breaker.
At the shed split into two circuits. Use one for the pool and the other for the shed lights etc.
All the wire used outside and under ground must be wet rated, even in conduit.
1/2 conduit will be large enough.
rules for burial
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Question
What does the Ontario Electrical Safety Code require when burying a non metallic sheathed cable supplying a shed, a detached garage, a post mounted receptacle, a 120 volt light fixture in my yard, or similar things?
Answer

The Code requires non metallic sheathed cable (NMWU) to be buried at least 600 mm (24") below non-vehicular areas and 900 mm (36") below vehicular areas. An example of a vehicular area is a laneway, an example of a non-vehicular area is a lawn.

The Code permits these depths to be reduced by 150 mm (6") where mechanical protection is placed in the trench above the cable.

Direct buried conductors (NMWU) shall be installed so that they run adjacent to each other and do not cross over each other and with a layer of screened sand with a maximum particle size of 4.75 mm or screened earth at least 75 mm deep both above and below the conductors.

A suitable electrical warning marker tape shall be buried along and above the cable route and be located approximately halfway between the cable and finished grade.

Where mechanical protection is used for reduced depth, it shall consist of one of the following and, when in flat form, shall be wide enough to extend at least 50 mm beyond the conductor, cables, or raceways on each side:

(a) Treated planking at least 38 mm thick; or

(b) Poured concrete at least 50 mm thick; or

(c) Concrete slabs at least 50 mm thick; or

(d) Concrete encasement at least 50 mm thick; or

(e) Other suitable material.

Rule 12-012.
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Old 08-26-2013, 09:07 PM   #10
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Ontario - 20Amp circuit to shed - some underground


That's great. I will get started. Can I split the circuits by just using a junction box?
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Old 08-27-2013, 07:10 AM   #11
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Ontario - 20Amp circuit to shed - some underground


for 120 foot lenght i would use a 12/3 specially for the motor. a 14/3 will have too much voltage drop
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Old 08-27-2013, 09:45 AM   #12
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Ontario - 20Amp circuit to shed - some underground


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That's great. I will get started. Can I split the circuits by just using a junction box?
Yes but you need a 2 disconnects (one for each circuit) at the shed. Easiest: install a 2 gang box in the shed with 2 single pole switches. Bring the 12-3 (or 14-3) feed into the switches and feed the 2 circuits out.
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Old 08-27-2013, 01:56 PM   #13
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Thank you All !!
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Old 08-27-2013, 05:48 PM   #14
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Ontario - 20Amp circuit to shed - some underground


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That's great. I will get started. Can I split the circuits by just using a junction box?
Yes you can and I do not know of any requirement for disconnects.
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Old 08-27-2013, 05:51 PM   #15
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Ontario - 20Amp circuit to shed - some underground


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Yes you can and I do not know of any requirement for disconnects.
Sorry, might be a NEC only requirement. But still a good idea.

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