trope - Why do consoles explode in "Star Trek"?

In Star Trek (an indeed many/most other sci-fi shows), a reoccurring theme is the exploding console, usually ones placed behind consoles where squishy human-folk sit.

^{Source: Memory Alpha}

Such explosions often result in casualties, or at the very least, lots of sparks flying all over the place.

This may simply be a trope, but are there any in-universe explanations for why consoles are so susceptible to overloads, even to the point that they cause causalities?

(Further reading/inexplicable loss of time: TVTropes: Explosive Instrumentation)

I've removed references to plasma conduits because it was causing some confusion as to what my question was about (though I think I'm the one confused). I recall some instances where conduits exploded behind consoles, causing fatalities, but I cannot cite specific episodes.

Answer

There's no need for in-universe explanation, since this is apparently an actual plausible real scenario (as in, an explanation relies on physics and technology as it is, and not something invented specially for Star Trek).

From this The Trek BBS thread (the poster manufactures insulator devices, so he knows of what he speaketh):

What you are seeing when a console explodes is the failure of the insulators and surge protectors. Just like the product I work with, Starfleet Issue Protective Isolators would have a maximum rating.

During combat, lets face it... both sides are slinging massive amounts of power around trying to make the opposing side explode. Eventually one or more isolators are going to be overwhelmed and an arc is going to jump between the power-carrying components of the ship and the frame... and all that power has to go somewhere.

Sometimes it dissipates harmlessly, other times it causes things to fail catastrophically. Frankly given the power levels we are talking about I'm surprised there aren't more internal explosions.

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