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The Y caps help with B field aswell...because they re-route the disturbance currents such that those disturbance currents  do not flow in such a wide area loop...whereby they would cause a high B field disturbance.

Actually since your injection transformer is likely with sinusoidal currents then maybe its not so important to y cap it......but yes, you have to connect its metal case to something.......so i guess connecting it to cct ground would be a good idea.....possibly connecting it with a Y capacitor instead of direct connection