Is there a way to earth-ground a 2t22 body?

[Robert Gift]

I have not found a terminal screw to ground the metal body.
All it has are three wires for the three-phase connection and two wires, P1 and P2 for the three internal thermal switches.
Should the metal body not be earth-grounded?
Thank you,

[Trey]

Well I don't know about a 2T22 or any other siren other than my personal STH10. My STH10 has a cable connection point to the triangular shaped metal pole top (thing) where it must have been grounded in case lightning struck it. Other than that it has no ground.

[JasonC]

All Federal sirens I have seen have the ground wire bonded to the base of the siren. There's no specific place to bond to the siren, so just install a copper lug somewhere on the stand and go from there. Make your own if you have to.