Underfloor Ducts

In some buildings, especially office buildings and most 3 computer facilities, special rectangular underfloor ducts with many access boxes for attaching fixtures allow wiring to be changed frequently. The ducts are installed

Snap-on covers offer easy access.

Cables with pre-installed terminations can be laid into raceway.

Top section has power wiring, bottom section has low-voltage.

Figure 30-8 Surface raceways.

below or flush with the floor (Fig. 30-9). In offices, un-derfloor ducts position power, data, and signal outlets close to desks regardless of the furniture layout. Parallel rectangular metal or heavy plastic raceways are laid on the structural slab and covered with concrete fill. Inserts connect the raceways to openings in the distribution ducts. Next, feeder ducts are installed at right angles to distribution ducts. The feeder ducts terminate in floor fittings for power and communications wiring.

Since they are cast in concrete, they are expensive. Their inflexible layouts sometimes result in underutilization in one area and inadequate supply in another.

Underfloor ducts were commonly used before the introduction of over-the-ceiling ducts and flat-cable wiring under carpets. Underfloor ducts are used with open floor areas that need to locate outlets away from walls and partitions. They are used when under-carpet wiring systems can't be used, and where outlets from the ceiling are unacceptable. Underfloor ducts may be a good choice where it is likely that furniture and other systems requiring electrical and signal service will be rearranged often within a set grid. Prestige office buildings, museums, galleries, and other display-case spaces, high-cost merchandising areas, and some industrial facilities may use underfloor ducts.

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