Non-segregated metal clad bus duct with insulating frames for supporting bus bars

Claim 1

IN AN ENCLOSED BUS BAR ASSEMBLY HAVING A METAL DUCT AND A PLURALITY OF CIRCULAR BUS BAR LOCATED INSIDE THE DUCT LENGTHWISE THEREOF IN SPACED RELATION TO EACH OTHER AND TO THE DUCT, MEANS SUPPORTED SAID BUS BARS IN SAID SPACED RELATION COMPRISING A PLURALITY OF MULTISIDED FRAMES OF CLOSED CONFIGURATION LOCATED AT SPACED INTERVALS INSIDE SAID DUCT TRANSVERSE THERETO, MEANS SECURING AT LEAST SOME OF SAID FRAMES TO THE DUCT, EACH ONE OF SAID FRAMES COMPRISING A PLURALITY OF RIGID MEMBERS MADE OF INSULATING MATERIALS AND HAVING RELATIVELY BROAD AND FLAT SIDES TRANSVERSE TO THE DUCT AND RELATIVELY NARROW INNER AND OUTER EDGES, A PAIR OF SUBSTANTIALLY SEMICIRCULAR NOTCHES IN THE INNER EDGES OF SAID MEMBER NEAR ITS ENDS, MEANS SECURING THE ENDS OF SAID MEMBERS TOGETHER IN SAID FRAME WITH A FLAT SIDE OF ONE MEMBER ENGAGING A FLAT SIDE OF AN ADJACENT MEMBER AND WITH THE NOTCHES IN THE ENGAGING MEMBERS REGISTERING ALONG ONLY A PORTION OF THEIR PERIPHERY SO AS TO DEFINE AN OPENING OF MORE THAN HALF A CIRCLE THROUGH THE FRAME AT EACH OF ITS INSIDE CORNERS, EACH OF SAID OPENINGS HOLDING A CIRCULAR BUS-BAR FOR SUPPORT BY THE FRAME.