three phase meter with only two legs

[Smart $]

Why would you want an ungrounded service? Would one even be legal in a store front? Would it change if there was another service, with 120 volt loads. Then would you then have to ground this service? I believe it would have to be bonded to the other service, as all systems and any metal that might become energized, have to be bonded together. Then you would be connected to ground that way.
Thanks
Mike

You can find reasons for having an ungrounded system in other threads. A storefront would be an atypical location.

The grounded conductor is required to be brought to the service equipment so it can be bonded to the local GES. Another service off the same transformer may technically cover the bonding, but compliance wise, each service is treated separately. It would be different if the service was run combined into one 240/120V 3ph 4W then split into after the service disconnecting means 240V 3ph 3W and 120/240V 1ph 3W.