Is it dangerous if there is a mains fault on a potable water pipe?

[gen x]

Both the main electrical cable (three-phase, line to neutral=230V, line to line =400V, 50Hz) and the water supply line(ppr pipe) are underground, below the earth in the garden, located next to each other, the main electrical power has damaged insulation, bare live line is exposed to a water leak from a broken main potable water line. So fault contact happen before RCD.

Could this situation be dangerous, especially if a person is showering at the same time? I am trying to understand whether this could create a shock risk to occupants and how effective will be RCD in house(downstream from fault contact) or breakers in upstream transformer(power source) would be in such a scenario.

House has classical wiring system,so every electrical device has ground wire connect to metal housing, water heater in bathroom as well.

 

[DaveE]

The building codes, at least in California, require that metallic water pipes be grounded to earth and that the neutral conductors are grounded at the service entrance. So people in the house should be safe. OTOH, I would still consider this a dangerous situation for other reasons.

 

[Averagesupernova]

So fault contact happen before RCD.

This still could trip an RCD depending on the path of the current on the water pipe. The pipe from the house to the shutoff valve may be metal but often switches to plastic at that point. Therefore the current path goes back into the house on the pipe. Depending on how the RCD is set up it may trip. In the USA residences would not have what we call a GFCI in a place that would cause a trip. It is not uncommon for a metal water pipe to be carrying several amp in the USA.

 

[Lnewqban]

Is there any grounding for the water contained in the plastic pipes system?
Could the grounding of the water heater be considered a water grounding?