Hi guys, a customer wants three baseboard heaters installed in each of the three bedrooms in his house. He wants to use 8 footers and install them under the windows in each room. I cant find anything in the code book that states how far an existing wall receptacle can be from the heater. I found in article 424.39 the clearance from the edge of outlet boxes must be 8 inches. But what confuses me is that are they talking about the heater being plug and play or do they mean the nm wire in the walls. Thanks for the help.