Never mind the double lug on the breaker, but can 2 - 10 gauge wires be used for an oven/stove breaker? TIA.
Parallel conductors are only allowed using 1/0 or larger, not #10
Appreciate it, ty!
I’m amazed at the amount of dangerous installations that HI’s find every day. This reminds me of a service call I went on years ago where someone ran a parallel #10’s feeder from the meter to the panel.
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The ingenuity of a human mind that “knows just enough to be dangers” is limitless 
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Wow!..talk about dangerous! 
Yes, it was a two-family house where someone ripped out the old 60 amp fuse panels and installed circuit breaker panels. For each of the 60 amp replacement conductors they used two #10’s twisted together.
Good find!!
I found this two days ago. 8 gauge wire on a 100 amp breaker feeding a sub panel, then that sub panel was feeding another sub panel, each in different detached structures.
For copper, should be single conductor No. 6 or No. 8 THWN per pole, but if run is 100 feet or longer should be minimum #6 to compensate for voltage drop.
Since you said THWN is it safe to assume that you’re not talking about NM cable?
I have seen both used, so I’m not sure if it matters to be honest. Either will most likely be stranded conductor due to the size and being able to route and pull the cabling along the installation path (although ground conductor may be solid).
I only asked because #8 NM cable cannot be used on a 50 amp circuit like the photo in the first post. It would be limited to 40 amps.
Correct - if breaker stays at 50A will require #6 regardless if NM or individual THWN conductors for both Cu and Al. Many modern oven/ranges are more efficient and only require 40A which can use #8 Cu (still must be #6 if Al).
No, not neccesarily.
#8 THWN 50 amps at 75°C.