The Biblical specifications which require using a wood that is oleoresinous and the coating it on the inside and outside is a pretty good description of making a large capacitor. Carrying on poles in a dry environment would tend to cause it to pick up an electrical charge. Over time, that charge could grow to become lethal.
I have always thought that was the mechanism of how it killed anyone who inadvertently touched it.
Well they did write that lightning bolts shot out of it, didn’t they?