I inspected a job where
1) non service rated/non fused manual transfer switch is outside below meter with a 30 amp/4 wire receptacle next to it
2) GEC was not brought to transfer switch
3) grounds and neutrals not separated at panel
My Question is this-
I know this has to be service rated, but doesn't this also have to be fused according to 230.91
Hopefully it was not a receptacle but was an inlet.
Non fused service entrance rated TS are available...meaning that would be required in this case. As far as separating the neutrals and grounds, where the service entrance is would determine where that is required (downstream). If the TS is service rated then IMO it becomes the service, and all past is a feeder.
Electrician needs to start over...
Looking in Square D catalog they have non fused double throw (transfer) switches that are suitable for use as service equipment. They do require fusing but have two diagrams of how to do so. One has fuses on each of the inputs, the other has fuses on the output.
If OP had one of these it can be located where it is, may need to have fuses instead of a circuit breaker as the service disconnect overcurrent device, not positive but that is what I currently see as what is required for these particular units as circuit breakers are not mentioned. If installed this way this switch is not the service disconnect, it is just a point along the service just like the meter. The grounding electrode conductor does not have to land there, but can, and separation of grounded and grounding does not have to take place, there but can. If they are separated there then you can not have bonding jumper in main panel otherwise EGC will be in parallel with neutral.
