On the back wall of the FO-side is a panel with the electrical connections of the 115V AC and 28V DC.

The sockets have a Us-version. In Europe, these outlets have little or not used. In America probably ... 🙂

Additional information and photos can be found on following page: https://www.flightdeck737.be/hardware/platform/aft-flight-deck/onderdelen-achterwand-fo-zijde/panel-electrical-sockets-115v-24v-achterwand-fo-zijde/