WE have some generators which are producing 11KV voltage. 3 Phase cables coming from Generator are passing through the cable tray, so this cable tray body is not connected to earth. Pl see the attached picture for better understanding.
Is there any risk to keep this tray floating or need to connect to earth.
Kindly share your valuable comments. 
Dear All Thans for your valuable comments.
Sorry for late reply,
There are two cable trays, one is Horizontal laid across the Generator Frame (Marked in Red), this cable tray has earthed with Generator frame at two yellow marked locations. Other second Cable tray marked in black is not grounded anywhere to earthed and MV cables are laid over it.
At generator end the cable Armour is not grounded to body (Pl refer the image attached) i think only at MV breaker end the cables are entering in cubicle through cable glands, where the Armour is earthed with gland.
The yellow cable entering in generator body is the frame earthed which is connected to the earthing grid via nearest earth point.
So, Generator Fram/Body is connected with earth, Horizontal cable tray is connected with Generator frame which is earthed.
Only Black marked cable tray (Vertical across the Generator frame) which carrying MV cables is not connected to earth. So, this what I'm worrying about. I think this cable tray also connect in the same earthing network where other cable tray and generator Earth is connected.
MV cable details is Armoured MV Power Cables cat. C,Type : 2XSYR(AL)Y Uo/U 8,7/15 kV.
Kindly share your valuable comments. 
Dear All Thans for your valuable comments.
Sorry for late reply,
There are two cable trays, one is Horizontal laid across the Generator Frame (Marked in Red), this cable tray has earthed with Generator frame at two yellow marked locations. Other second Cable tray marked in black is not grounded anywhere to earthed and MV cables are laid over it.
At generator end the cable Armour is not grounded to body (Pl refer the image attached) i think only at MV breaker end the cables are entering in cubicle through cable glands, where the Armour is earthed with gland.
The yellow cable entering in generator body is the frame earthed which is connected to the earthing grid via nearest earth point.
So, Generator Fram/Body is connected with earth, Horizontal cable tray is connected with Generator frame which is earthed.
Only Black marked cable tray (Vertical across the Generator frame) which carrying MV cables is not connected to earth. So, this what I'm worrying about. I think this cable tray also connect in the same earthing network where other cable tray and generator Earth is connected.
MV cable details is Armoured MV Power Cables cat. C,Type : 2XSYR(AL)Y Uo/U 8,7/15 kV.
Kindly share your valuable comments.
