I'd have to disagree. Proximity of busbars and connections are irrelevant so long as arcing concerns are addressed. The issue here had nothing to do with proximity, and everything to do with failure to follow safe protocol. Always treat electrical systems as if they've got 200+ volts on them and careless mistakes such as this will not be made. Had OP treated this as if it was a high voltage system (which all electrical systems should be handled as), the mistake wouldn't have been made because you don't wrench on live components. Batteries are slight exception in that you can't safe them, but you can wear gloves (I prefer a 5-7 mil nitrile) and eye protection, and always exercise caution.
Those of us who play with high and low voltage systems have 1 set of operating procedures -- safe it, verify it's safe, then proceed with work. The battery is the last thing to bring into a circuit and the first to be removed. Always verify with a meter, and drain caps with an appropriate resistor where appropriate.
Careless procedures eventually lead to the human being the irreplaceable component that's given up its magic smoke. Stay safe, stay alive.
I shorted my battery (with a spanner) from the battery fuse to the negative bus bar of the lynx distributer (see red pen) just after the shunt. Note the black cables with red heat shrink are positive cables. As such it was a short across my battery bank (not through the fuse or battery switch). There was a small spark/noise, the spanner was metal no insulation, my lithium batteries are inactive and had 0V across them prior to this, I didn’t feel any zap, the spanner and nut both have black spots and the spanner was somewhat welded on. How do I test my batteries aren’t f$@&?! given they are inactive and I need to charge them first? I was hoping by the fact that I didn’t die, the spanner didn’t melt that maybe the batteries have a self protect. I thought I read in the renogy manual online that if they short I just need to reactivate? Which needed to be done anyway. Anyone know or had this happen, they are brand new, it was a very careless mistake that I was wary of not doing, rookie error 
