According to Myron Samila :
UL is now accepted as equivalent to CSA approval in Canada.

This is incorrect.
----------------

You're right. Apparently the person who told me of this (years ago) misunderstood, and
my understanding was broken. The stuff about NAFTA will be pretty well removed entirely.

The situation now is more formally that there are "standards testing labs" and
"country-specific standards" - which means that in many cases the marking has to indicate
_both_ the lab and the standard. Ie: "UL" (is a lab) and "C" is a country, hence "ULC"
means approved for Canadian standards by UL (ULC happens to be a separate arm of UL,
but it isn't necessarily). Ie: "ETL" is a lab (used to be Warnock Hersey in my old
CEC), and cETL means approved by ETL for Canadian standards.

Furthermore in order for a "c" in "cETL" to take effect in Canada, ETL has to be approved
as a lab explicitly in the CEC (which it is).

Similarly, there is a "CSA" tag that has "US" in small letters. Which means that CSA
has tested it to US standards. However, usCSA isn't blanket-approved by the NEC - only
in some specific municipalities (eg: Los Angeles) is usCSA considered equivalent to UL.
CSA acceptance in the US is somewhat broader outside of electrical stuff (eg: plumbing
fire, gas equipment).

It is unlawful for a store to sell a device that is not CSA, cUL (ULC) or ETL approved or
otherwise.... (electrical devices that is, that plug in, we are even talking wall
warts....)

To amplify:

"otherwise..." showing compliance to Canadian electrical codes by a lab approved
to do so by Canada.

In North America the utility companies are required
to supply a split-phase 240 volt (+-5%) feed to your house.
This works out as two 120V +- 5% legs. Additionally, since there
are resistive voltage drops in the house wiring, it's not
unreasonable to find 120V has dropped to 110V or 240V has dropped
to 220V by the time the power reaches a wall outlet

Incorrect, they supply single phase 220V, there is a phase angle between the two that make
up a 220V potential, period. When you take one leg of the single phase supply and measure
the potential between neutral and "hot", you get 120V. It is not an additive thing,
120+120 = 240... no no. Just like three phase power, 120V+120V= 208V, and 3 phase 600V =
347+347=600V. Catch the drift?? We are talking phase angles here as well....

There are _no_ phase angles to deal with with an ordinary 240V single-phase residential
feed. The two 120V legs are exactly 180 degrees out of phase with each other with respect
to the grounded conductor (neutral in the FAQ terminology), so the peak-to-peak and RMS
voltages _exactly_ add.

You can't get phase angle shifting if you have only two wires on the primary of a
distribution transformer (usual residential feed).

Your local voltage can drop to 110V when the local demand is high (peak times especially).

Already mentioned.

one of the other wires will be white (or black with white or
yellow stripes, or sometimes simply black). It is the neutral wire.
It is connected to the "centre tap" (CEC; "center tap" in the
NEC ;-) of the distribution transformer supplying the power. It
is connected to the grounding conductor in only one place (often
inside the panel). The neutral and ground should not be connected
anywhere else. Otherwise, weird and/or dangerous things may happen.

Incorrect, house wiring at least in my neighbourhood distributes the two hots, and your
neutral is picked up from Ground...

This is terminology confusion. There are three wires coming from the secondary
of your distribution transformer. Two hots and a "grounded conductor" which the
FAQ calls "neutral" (in agreement with common usage, see section on that).

You _cannot_ get a normal residential 240V feed with only two wires. That would
imply that the neutral (grounded conductor) difference current was going through
the dirt. Which is a massive no-no - you have to have a conductor back to the
transformer for the difference current. Otherwise, you can start fires in the dirt
or electrocute passers-by.

And some of your Ontario Hydro information is from 1990.... Umm, that is 14 years old.....
Codes have changed, I'm not an electrician, but in my line of work, I have to know the
electrical code inside out....

I know. I posted it as I did to reintroduce the FAQ after a several year hiatus,
and start getting commentary where it needed to be updated.

This is my to-do list for updates so far:

Remove bit about NAFTA. CSA/ULc in Canada, UL in US only. Full situation
way too confusing for scope of FAQ...
Update for AFCI requirements in bedrooms under NEC.
Update for new GFCI requirements in kitchens under NEC.
Update for (apparent) approvals of combo 15-20A 120V receptacles in Canada
Update for (apparent) approvals of 20A unsplit counter receptacles in Canada.
Call the BX armor thingies "anti-shorts" (double check slang/trademark usage
ie: issues with "wirenuts").
CEC book is now ~$90-100, focus more on PS Knight's books.

Others?

Whenever BX cable is terminated at a box with a clamp, small
plastic bushings must be inserted in the end of the cable to
prevent the clamps forcing the sharp ends of the armor through
the insulation.

They are called anti-shorts, they are usually red.

Thanks.

The CEC is slightly different. The CEC never permits cable
armor as a grounding conductor. However, you must still
provide ground continuity for metallic sheath. The CEC also
requires grounding of any metal cable clamps on plastic boxes.

This statement needs to be changed, a BX armour cable's exterior armour is not allowed to
be used as a ground conductor, ever....

"Never permits cable armor as a grounding conductor" means exactly what you said.

[As contrasted to the US where BX/AC cable sheath is considered to be an acceptable
ground. Including that silly 20ga bare wire they add...]

Conduit can be used as a ground in some areas of
Canada, although on some installations I've observed, a seperate ground wire was pulled
through the conduit as per code.

It usually is required because the code tends not to assume that conduit is perfectly electrically
continuous.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.