[CAUSA]

Does it have a UL sticker?
Note: 2 and 4 in the notes.

Are you using the manufacture high temperature whip?

If UL approved and it has to be inspected, since as the installer you pulled the permit?

Install as the manufacture instructions.

 

[CAUSA]

So, install as per manufacturer instructions.

Use the supplied porcelain marretts. High temp fibreglass tape if needed.

It is a resistance heater. So only way for high current, is a bolted fault to ground or phase to phase.

Resistance heaters when failing, the tungsten filament burns open. I have seen the filament burn through to ground but the main OCP shut the system down as designed.

I would be more worried of combustible materials on the wall or close to the heater mounted on a wall or ceiling.

Your main feeder is G fault and Arc fault protected.

Just remember if you modify the panel you change the UL rating (technically).

Contact the manufacturer with questions and see if there is a retrofit for protection on the 4K heater conductors.