parallel service feeders

[Suncoastpower]

I have a situation where i have an existing 100 service to a warehouse, with the proper sized conductor and conduit for the use. The customer wants to get more power to his unit (200 amps), my thought was to run a new parallel set along the existing one, which would be cheaper than tearing down and replacing with a larger conduit and conductors. My issue is the area around where the new service disconnect will be installed may only allow me to run one conduit out. Can I run a 4/O (Alum) out to a large junction box, just outside the meter room, and tap into a parallel set from that point? Of course keeping everything equal. I do this all the time on the load side of service disconnects in troughs, but can't think of a time I tapped anything on the load side.

 

[david]

Keep in mind conductors are not generally paralleled unless they are a min. size of 1/0
What size conductor to the original 100 amp

what size service does this ware house have. it sounds like there are multiple tenant units

 

[Suncoastpower]

David, the main service size is not a problem, another tenant has isolated himself from the rest of the service, leaving room for the expansion. The conduit used for the existing service is 1 1/2" EMT so I have room to increase the wire size in that one.
Looking at the costs it may not be worth it in the long run.