Which panelboard supplies the receptacle at Column Location 1-C?

To determine which panelboard supplies the receptacle at Column Location 1-C, it's essential to refer to the specific design and layout indicated in the blueprints provided in your training. Panelboard XX1 is labeled in the layout as being responsible for powering various circuits in the vicinity of Column Location 1-C, which includes the designated receptacle.

Understanding the layout and how panelboards are connected to different circuits is crucial in blueprint interpretation. Each panelboard is generally assigned to specific areas or dedicated loads, and tracing the circuits back from the receptacle to its corresponding panelboard confirms that XX1 supplies power to this particular location, thus making it the correct choice.

Other options, including the panelboards MSB2, G, and A, may supply power to other receptacles or circuits but are not shown as directly connected to Column Location 1-C in the context of the blueprint. This distinction is vital for ensuring accurate identification of power sources within electrical schematics.