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[Kevin Graf]

I've seen my fair share of "junctions" inside breaker panels here in the states, but can't say for sure whether it was legal or not.
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Yes it's permitted in the US code. But you have to follow all the NEC fine print.  Each connector part has to be rated for the application, there as to be room in the box, smaller wires may not be paralleled at both ends.

[Kevin Graf]

But they may get you with the rated for the application part.
What is the temperature rating on wire nuts?

[Chris Clark]

I'm just relaying what I've witnessed, at various places... I'm not an electrician and stay out of panel boxes at all costs, personally. So, I have no clue what they were rated...

[Mike Sokol]

I think the takeaway from this thread is that any old or even relatively new circuit breaker can fail in the ON position. Sometimes they won't trip with an over-current event. And sometimes they won't open when manually switched OFF. And it's certainly possible that someone in the past improperly fed some wiring through your panel from a secondary panel. So ASSume nothing and always verify that the power is indeed off before reaching into any panel. I personally double-check the voltage with a meter after powering off, and even then I scratch any wire with the back of my knuckle instead of grabbing on with my hand.   

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