Adroga,

Quote
sometimes we are put in a scenario where we have to work live in a junction box.


I see that you registered as a "future apprentice" a year and a couple of months ago.
Not to be demeaning to you in any way, but there's absolutely no reason for you to be working live circuits AT ALL.

347V, to me, says lighting circuits.
The same scenario unfolded at one company I worked for, except for the voltage, which was 277V, and the level of experience (Journeyman).
The electrician, working from a scissor lift 25' up, was leaning across a rack of conduits, just to "make up some wires" in a junction box.
He was electrocuted (read DEAD) before he hit the concrete slab.

You listen hard and good.....
There is no condition under which you are required to work under those circumstances. If you can't work it unenergized then don't work it at all.

The only thing that gloves are for are for verifying that the power is off, and will remain off by your personal padlocked lock out device.

Did you report the incident, and if so what did your foreman, or whoever is in charge say?