While setting up 212 for the first time I ran into postion jumper links question, input voltage 200 or 230? Do i need to buy a voltmeter to check?

I have 200 amp service, it has a 30 amp breaker with # 8 wire I use for my thunderbolt and plasma cutter. Will that work? I plan on installing a 40 amp breaker with #8 for the 212. Am i on the right track?

Any help would be greatly appreciated!