Definition - What does Duct Bank mean?
A duct bank is a bundle of PVC conduits, which are surrounded by a protective casing (either concrete or metal). These PVC conduits are used to carry electrical or data cables as part of a utility network or for a specific building or commercial application. The advantage of using duct banks is that the utility cables are protected by the casing and the cables can be replaced easily by drawing a new cable through the conduit.
Trenchlesspedia explains Duct Bank
Underground utility cables are vulnerable to damage due to excavation activities during construction. They are also difficult to repair as single cables sealed underground. However, the development of trenchless construction techniques has created the opportunity for duct banks to be installed that house cables in a safe environment, while making future repairs much easier to carry out.
Pull wires are used to pull a new cable through the conduit without any excavation required. This applies to the first cables to be installed once the duct bank has been constructed, as well as replacement cables down the line. Care must be taken to ensure proper drainage of the duct bank as well as allowing for expansion and contraction.