Why isolate CP before wet welding

On a DP2 semisub at 95 ft last spring, we pulled the cathodic protection isolation and ran Hydroweld 22 for a small padeye repair. Beyond stabilizing the arc, what’s the safety driver ABS/IMCA point to for isolating anodes and returns during subsea hot work on a jacket — think unintended current paths and diver/equipment protection?

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍⁠⁠‌‍‍‌‌‍⁠​‌⁠​‍‌‍‍‌‌‍‌⁠​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠‌‌⁠⁠‌⁠‌​‌‍⁠⁠‌⁠​​‌‍‍‌‌‍​⁠​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠​‍​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‌​⁠​‌​⁠​‍​⁠​‌​⁠‍​​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍‌‍​‍‌‍‌‌​⁠‌‍‌⁠​‍‌‍​⁠‌‍​‍‌​​⁠​⁠‌‌‌‍⁠‍‌‍⁠⁠‌‍‌​‌‌‍​‌⁠‍​​⁠‌​‌‌‍​‌‍‌‍​‍​‍‌⁠⁠‌​​