you probably have something like this: http://electrical.hardwarestore.com/14- ... x#features
the meter and panel are combined together, in fact they have a name "CSED" for "Combination Service Entrance Device", and they come in handy on upgrades to existing services, where the interior panel is full, you can just replace the meter box with one of these and you then have some "instant" extra breaker positions availble...
P.S. my service is being upgraded to 200A, and my interior panel is full, so we are using this, to add 4 more 2 pole circuits, and this also has "feed through lugs" which will be used to connect to the existing interior panel (and it will be upgraded to 200A as well), the exterior circuits will be used to bring a new service to the garage, for the EV, and also for future PV tie in. http://www.lowes.com/pd_79498-296-RC816 ... logDisplay