My question concerns the requirement for a local (within site of) disconnect for a 2400vac to 120/240vac 25KVA transformer. Here's the installation: a wellhouse is to be fed from a main control/power distribution building. Three wells exist already- they are located on the riverbank approximately 1500' to 2000' from the main control/power distribution building. Each are their own discreet building. A fourth is proposed in the same general area. The building is to be off the ground by approximately 15' or so. The building itself is to be 16'x 16'x 12'. The building will contain a 350HP vertical turbine well pump, a 25kva transformer, a Lighting receptacle panel and all of the required accessories (lights, ventilation fan, electric heater etc.). The transformer will feed the lighting receptacle panel and will be grounded as required. According to Article 430.102 the disconnect for the motor can be located 2000' away in the control/power distribution building, fed from a starter with a fusible disconnect (lockable in the open position). My question is regarding the transformer. My first assumption is that it too falls under Article 430.102 (as it is a controller by definition supplied in Article 100- Controller- A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.). Am I required by the NEC to provide a disconnecting means for the transformer? Article 110.58 would tend to infer that a local disconnect is required but is this general requirement superceded by specific requirements of Article 430.102?