2000 Amp CT Cabinet — 600 Volt NEMA 3R

CT stands for Current Transformer. On an electric meter, a CT is a device that steps down a high current to a smaller, measurable signal — typically 5 amps — that the revenue meter can safely read and record. CT-rated meters are used on large commercial and industrial services where running the full current directly through the meter is not practical or safe.

For revenue metering applications, accuracy class 0.3 or accuracy class 0.6 current transformers are most commonly used, with Class 0.3 preferred for higher-accuracy billing requirements. The class defines the percentage error tolerance of the CT. Utility specifications often dictate the required CT accuracy class, burden rating, and ratio for a given installation — always verify with your serving utility before specifying.

NEMA 3R is an enclosure rating that designates the cabinet as suitable for outdoor installation. A NEMA 3R enclosure protects internal components against falling rain, sleet, and external ice formation. For CT metering cabinets installed outdoors — such as at utility service points on commercial buildings or industrial facilities — a NEMA 3R rating is the standard minimum requirement.

A 600 Volt CT cabinet is rated for use on electrical service systems with a maximum voltage of 600V AC. This covers common distribution voltages including 480V, 480Y/277V, 240V, and 208Y/120V systems. The 600V rating is the standard class for low-voltage commercial and industrial metering cabinets and aligns with UL and NEC requirements for these applications.

EUSERC (Electric Utility Service Entrance Requirements Committee) approval is required by many investor-owned utilities in the western United States for service entrance equipment, including CT metering cabinets. For 2000A services in covered utility territories, EUSERC approval confirms the equipment meets utility interconnection standards. Always confirm your serving utility's specific requirements before ordering.

Yes. DEI Power specializes in building CT cabinets and service entrance equipment to approved utility specifications. Because utility standards vary by jurisdiction and serving utility, CT metering cabinets must be configured to match your utility's exact requirements for CT ratios, conductor entry, metering socket type, and labeling. Contact a DEI Power specialist to discuss your project requirements and receive a custom quote.