Two transformers - models 15951 and 15952 - can be used in many industrial control systems. In addition to fire and burglar alarms, the transformers are ideal for intercom systems, paging systems, ...

A line of Class 2 control transformers with multitap primary windings is designed for use in industrial and commercial applications. The transformers are precision layer wound for longer service life.

If the power source is a listed Class 2 transformer or listed Class 2 power supply — or it’s in listed equipment marked to identify the Class 2 power source — you’ve got a Class 2 circuit between the ...

In last month's “Code Basics” article, starting on page 56 of the September issue, we spent most of our time discussing Class 1 circuits. Now, it's time to switch gears and focus on Class 2 and 3.