Edwards 590 Series Class 2 Signaling Transformers are easy to install, low voltage power sources for residential, commercial, and industrial uses. Mounts in a standard 1/2 (13mm) knockout or surface mounts using the provided foot mounts. These transformers are suitable for mounting in both plastic and metal back boxes. May also be used with the Cat. No. 593 transformer plate for enclosed mounting in a standard two gang outlet box. The 592 592Y transformers are for commercial and residential use. The 24V, 20VA secondary is ideal for applications requiring longer wire runs such as that needed in multiple family dwellings.