Is there anything wrong with bonding the grounding systems of two separate services?

[BretHeilig]

I work for a midsize photovoltaics integrator, just got placed on a project where a single PV array is intended to power two different buildings. Without going too far into it, the entire non-current-carrying portion of the array (steel supports, module frames, etc.) is common, and the array is intended to supply part of its power to one electrical service, and part of its power to another (via a cluster of small inverters). Because of other codes related to PV, this means the array will have to be bonded to both services' grounding electrodes.

I am concerned because this means the two service neutrals will also be bonded together through a very low resistance connection. Does this not mean that potential exists for current to flow down one service lateral, through a load, through the grounded portion of the array, then up the other service lateral? I'm unfortunately not sure if the two services are on the same transformer.

Thanks for any advice,

Bret

 

[iwire]

It is no different then services on separate buildings served by a metal water piping system.

Basically you have no choice but to create these parallel paths.

 

[Pierre C Belarge]

The flip side of this is there is a chance that a potential of difference could develop between the two supplies, creating a shock hazard. If the two are not bonded together.