Which Cat Meter is used to measure 3 phase at utility connection and any outdoor connections?

Which Cat Meter is used to measure 3 phase at utility connection and any outdoor connections?

• A. Cat4
• B. Cat3
• C. Cat2
• D. Cat1

Answer: (A)

CAT ratings indicate how much transient voltage a meter can safely withstand and where it’s appropriate to use. For measuring 3-phase power right at the utility connection and in outdoor installations, the highest rating is required because you’re at the source of the power and exposed to larger surges from lightning or switching. Cat 4 is designed for measurement at the origin of the electrical supply, including service entrances and outdoor connections, and it provides the necessary protection for both the instrument and the user in these environments. In contrast, Cat III covers distribution-level inside buildings, Cat II covers portable appliances, and Cat I covers circuits not connected to mains. So Cat 4 is the correct choice for utility-side and outdoor 3-phase measurements.

CAT ratings indicate how much transient voltage a meter can safely withstand and where it’s appropriate to use. For measuring 3-phase power right at the utility connection and in outdoor installations, the highest rating is required because you’re at the source of the power and exposed to larger surges from lightning or switching. Cat 4 is designed for measurement at the origin of the electrical supply, including service entrances and outdoor connections, and it provides the necessary protection for both the instrument and the user in these environments. In contrast, Cat III covers distribution-level inside buildings, Cat II covers portable appliances, and Cat I covers circuits not connected to mains. So Cat 4 is the correct choice for utility-side and outdoor 3-phase measurements.