3 phase 3 wire service

[Hv&Lv]

On a typical service the grounded service conductor is connected by the bond jumper to provide a return path for ground faults.
I saw a 3 phase 3 wire service with no service conductors other than the 3 phase conductors.
3 service conductors in and 3 load conductors out from the service main breaker and a connection to an electrode system is all they have in the customers service. No others conductors were provided by the utility company.
Is this OK?
What acts as the ground fault return path to the source?

Are you sure one of the phases wasn't grounded? (corner grounded)

 

[kwired]

question to the op. what is the service intended for?

how and where will they derive as neutral if one is needed?

That would have to come from a separately derived system.

how and where will they ground an initial inside transformer, if single pahse power is neede.

That is done no differently than any other separately derived system. The ungrounded system still requires all non current carrying metallic raceways, enclosures, etc to be connected via an equipment grounding conductor, and a grounding electrode system.

they (whoever is using this system) won't get any kind of good single pahse power from this system without an initial point of " intentionally grounded service conductor" ie service neutral.

Why? Supply two phases of the ungrounded system to a transformer and supply a grounded system with the secondary - It will be no different than any other separately derived system.