Use with Extension Wire to create custom lengths of Just Plug Cables. Reach Hubs anywhere on your layout or project. Just Plug™ Lighting System No electrical knowledge or special tools needed...just plug and you're done! The Just Plug™ Lighting System is a quick and easy way to add realism and interest to new and existing layouts and other projects. Individual bulb brightness can be controlled, and the modular design allows for easy expansion. Just Plug is compatible with DCC and works for any scale.