Electrical power supply structures

An electrical power supply structure comprising:

• a barrier support plate comprising one or more openings, the barrier support plate configured for mounting over a hole through a floor of a building;
• a first support structure extending longitudinally upward from an upper side of the barrier support plate;
• and,
• a second support structure extending longitudinally downward from a lower side of the barrier support plate through the hole,
• wherein each of the first and second support structures comprises a cable bus for holding a plurality of high amperage electrical cables, each cable bus defining a cable enclosure and having:
• one or more shielding members extending within the cable enclosure in the longitudinal direction and dividing the cable enclosure into two or more longitudinal chambers;
• and
• a plurality of cable support members extending in a transverse direction across the supporting structure, the plurality of cable support members being longitudinally spaced apart along a length of the supporting structure, and each cable support member comprising a plurality of cable holders arranged in a plurality of groups, each group located within one of the longitudinal chambers,
• wherein the cable support members are configured to support electrical cables carrying multiphase electrical power and comprising a plurality of cables for each phase of electrical power, such that each plurality of cables for each phase of electrical power may be supported within a distinct longitudinal chamber.