OMG. I did not think about what can happen if a load is blown, but an internal meltdown leading to a 300VDC short cut is the most likely version. And if the first is gone, the other will follow immediatley.
But I think that a suitable circuit breaker (even a well dimensioned short copper line will do) should always be a part of the setup...?
btw: If two EL are to put in series or parallel (to balance the load) is a question of the used mode, isn't it?