Which Cat Meter is used to measure 3 phase distribution and single-phase lighting equipment?

Which Cat Meter is used to measure 3 phase distribution and single-phase lighting equipment?

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

Answer: (A)

CAT ratings indicate the level of transient voltage protection a meter must handle in different parts of an electrical installation. For measurements on three-phase distribution and lighting circuits inside a building, you’re in the distribution-level zone, which is Category III. This rating covers equipment connected to the building’s distribution wiring, such as panel boards, feeders, and lighting runs, and it’s designed to withstand the typical surges found there. Category IV is for measurements at the service entrance or outdoor wiring, which have higher transient energy; Category II is for portable appliances and tools; Category I is for low-energy, signal-level electronics. So for measuring 3-phase distribution and single-phase lighting, Cat 3 is the appropriate choice.

CAT ratings indicate the level of transient voltage protection a meter must handle in different parts of an electrical installation. For measurements on three-phase distribution and lighting circuits inside a building, you’re in the distribution-level zone, which is Category III. This rating covers equipment connected to the building’s distribution wiring, such as panel boards, feeders, and lighting runs, and it’s designed to withstand the typical surges found there. Category IV is for measurements at the service entrance or outdoor wiring, which have higher transient energy; Category II is for portable appliances and tools; Category I is for low-energy, signal-level electronics. So for measuring 3-phase distribution and single-phase lighting, Cat 3 is the appropriate choice.