Manual Transfer Switch For Generator Power What You Need to Know (Canada vs. U.S.)
Today, we’re diving into manual transfer switches for generators—what they are, how they work, and what rules apply here in Canada versus the U.S.
What Is a Manual Transfer Switch?
A manual transfer switch allows you to manually switch the power source for your home or building between the utility grid and a generator during a power outage.
In this video, we’re looking at a 30-amp manual generator transfer switch. It’s mounted beside the panel and enables you to safely and legally connect a portable generator to your electrical system.
Canadian Code & Setup
In Canada, the setup must meet stricter requirements compared to the U.S.
Here’s what’s required:
- Three-pole switch on each side (utility and generator)
- This means two hots and one neutral are switched on both sides.
- A mechanical interlock is used to prevent both power sources from being active at the same time.
- You cannot turn both the generator and the grid on at once, and that’s by design.
Why?
Because backfeeding the grid from a generator during an outage is extremely dangerous. It could injure utility workers and damage equipment.
So, in a power outage:
- You switch off the utility side.
- Flip the interlock switch.
- Turn on the generator side.
When power is restored:
- Turn off the generator side.
- Flip the switch back.
- Turn on the utility again.
U.S. Differences
In the U.S., some transfer devices are allowed to be bolted onto panels (like a Square D panel), making them a bit more plug-and-play. These are typically breaker interlocks that allow a safer way to backfeed through a main panel.
However, in Canada, these types of devices are not permitted. Canadian code requires a dedicated generator panel and a complete 3-pole break (neutral and both hots).
Why Is a 3-Pole Break Important?
This ensures complete electrical isolation of the generator from the grid.
- Both hot wires and the neutral must be disconnected from the utility when the generator is in use.
- This is critical for safety and code compliance.
Final Thoughts
That’s a quick overview of manual transfer switches and how the rules differ between Canada and the U.S.
If you’re installing a system like this, make sure it meets local code, and when in doubt, consult a certified electrician.
We’ve added some links in the description for recommended generator panel products.
Thanks for watching!
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