This is the culmination of a few posts (Disconnecting 240 hots without disconnecting neutral?, 240v only subpanel, no ground?) to see if this seems right.
I had a subpanel A with 20A double pole breaker leading to a set of baseboard heaters. I wanted to run a 40A subpanel from that breaker position instead. I disconnected the two blue wires running to the heaters, replaced with a 40A breaker, and ran 8 AWG wire to the subpanel which is shown below. This is for 240v only, I will label the panel such, but does this look correct, hot/hot/ground without a neutral connection? (Realizing I should black wrap the white wire to the circuit breaker to indicate a hot leg)
Initially, there was concern the first subpanel wasn't adequately grounded so I ran an 8 or 10 AWG (I think 8) from subpanel A to the original main breaker ground/neutral bar).
Thanks for any thoughts!