a transformer power truss section 700 to convert 120 vac or 220 vac utility power into 12 vac low voltage for the power tracks in fig1 6a and 6 c the power truss section 700 comprises three truss chords 701 703 of which chord 702 carries the low voltage wiring and lighting tracks a utility power supply pigtail 704 leads in through a slot 705 in chord 701 and has a ground connection 706 two step down transformers 708 and 710 convert e g 120 vac to 12 vac and are respectively protected by circuit breakers 712 and 714 these each have a pushbutton reset shown for 714 that a user can get to easily on the outside a low voltage output from step down transformer 708 connects through a wire lead 716 to an interconnector 718 similarly another low voltage output from step down transformer 710 connects through a wire lead 720 to an interconnector 722 these respectively plug into a power track accessible through slots 723 726 fig7 b shows how the electrical components can be enclosed fig8 a 8c represent a transformer power truss t section 800 to convert 120 vac or 220 vac utility power into 12 vac low voltage e g for the power tracks in.