Gentlemen:
Please be aware of one important thing in this thread....
The OP is from Canada!
Some of the comments within are from guys that are 'stateside'.
Here in the US, there is no NEC requirement that the exterior receptacle be on a dedicated circuit, and/or not tapped from an interior circuit. We prohibit tapping it from the SA circuits in a kitchen, and bathroom.
I refer this as a design issue, and not a code issue.
And, I have to agree, even here in the US, common sense cannot be legislated.
