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Utilities
Of or related to any publicy utility institution mandated with maintaining the infrastructure for a particular public service; such as the provision of water, gas and electricity.
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Utilities > Electricity 
dual voltage switch
Electrical equipment; Electricity
A switch used to select primary windings of a transformer.
dual voltage transformer
Electrical equipment; Electricity
A transformer that has switched windings allowing its use on two different primary voltages.
duct
Electrical equipment; Electricity
A channel for holding and protecting conductors and cables, made of metal or an insulating material, usually circular in cross section like a pipe. Also referred to as Conduit.
dynamic DNS
Electrical equipment; Electricity
This is a system by which Internet Service Providers temporarily assign IP addresses. This allows the reassignment of the address when no longer in use.
earth fault protection system
Electrical equipment; Electricity
A protection system which is designed to excite during faults to earth.
earthing transformer
Electrical equipment; Electricity
A three-phase transformer intended essentially to provide a neutral point to a power system for the purpose of grounding.
Sub-categories
- Electricity (7954)
- Emergency systems (0)
- Gas (1175)
- Sewage (66)