In transformer notation, a two-number ratio is used to denote system voltage and primary coil rating. The first number usually represents the system voltage, while the second number indicates the primary coil rating.
In the context of transformers, a notation is commonly used to represent the transformer specifications. The notation is often in the form of a two-number ratio, where the first number represents the system voltage and the second number represents the primary coil rating. This notation is known as the voltage ratio.
For example, if you see a transformer specified as "10/240V," it means that the system voltage is 240V, and the primary coil rating is 10V. The system voltage is the voltage level at which the transformer is designed to operate within a power distribution system, and the primary coil rating is the rated voltage on the primary winding.
So, in this notation, the first number typically represents the system voltage, and the second number represents the primary coil rating.