[tradle]

To clarify even further. If you orient the blocks correctly the black and red blocks are technically isolated between each other by the wall of the red (or black) block itself. There also is a decent air gap on both sides of the wall, which is easily enough insulation between the terminals.

In the power distribution diagram it appears that there are both panels and blocks used. In between the red and black blocks are both a grey panel and a grey block on the "exposed" side. And also at the far end of the block where it would be "exposed" if the grey mounting block were not there.

So what is required?