To determine what size transformer you need, analyze your existing power system and use that information to calculate a corresponding transformer. When sizing your transformer, it's important to consider input and output voltage, as well as the VA rating that your specific worksite requires. Additionally, to find the kVA you’ll have to make a series of calculations based on your electrical schematics. Besoin d’aide? Contact one of our equipment experts for further guidance.

United Rentals offers three different types of electrical transformers: step-up, step-down and isolation transformers. Step-up transformers are designed to increase voltage. Step-down transformers decrease voltage. Isolation transformers have isolated primary and secondary windings to reduce voltage spikes in the supply line. Transformers commonly employ multiple types at once. For example, isolation transformers are capable of both stepping up and down voltage levels.

A step-up transformer increases from input to output voltage and is typically used for enhancing and boosting voltage for power equipment with higher voltages. A step-down transformer decreases from input to output voltage, making transmission power cheaper and safer.