Which statement about the output voltages in the standards is correct?

Which statement about the output voltages in the standards is correct?

• A. They are not specified
• B. They are specified
• C. They must be DC only
• D. They must be AC only

Answer: (A)

Standards set safety, performance, and testing rules that apply across many devices and applications, not a fixed voltage for every output. Because equipment is designed for different systems with varying voltages, there isn’t a single universal output voltage specified in the standards. Instead, you’ll encounter references to the system voltage, insulation and isolation requirements, and protection criteria appropriate for the device’s rating. Standards also cover both DC and AC outputs, so neither DC-only nor AC-only is correct. So the statement that output voltages are not specified is the best choice.

Standards set safety, performance, and testing rules that apply across many devices and applications, not a fixed voltage for every output. Because equipment is designed for different systems with varying voltages, there isn’t a single universal output voltage specified in the standards. Instead, you’ll encounter references to the system voltage, insulation and isolation requirements, and protection criteria appropriate for the device’s rating. Standards also cover both DC and AC outputs, so neither DC-only nor AC-only is correct. So the statement that output voltages are not specified is the best choice.