GROUNDING

ELECTRODE

PER NEC 250-24

Figure 1. Preferred Grounding Configuration, 480 or 600 VAC input and output

7.1.Preferred Grounding Configuration, 480 or 600 VAC Input and Output, Isolated Power Distribution Units, Wye-Connected Service

One of the most-common configurations of the Series 600T UPS is the Single Module System with 480 VAC input, 480 VAC output, and a connected load consisting of multiple Power Distribution Units (PDUs) with isolation transformers in the PDUs to produce 208 VAC. For Canadian customers, the UPS modules usually have 600 VAC input and output. The same principles apply if the connected load is an isolation transformer feeding various loads. Figure 1 above shows a typical installation.

Notice that the UPS module main input and bypass input are connected to a grounded-wye service. In this configuration, the UPS module is not considered a separately derived source. The UPS module output neutral is solidly connected to the building service neutral, which is bonded to the grounding conductor at the service entrance equipment

The isolation transformers in the PDUs are considered a separately derived source. Therefore the PDU neutral should be bonded to the PDU grounding conductor and connected to a local grounding electrode in compliance with NEC 250- 26.

Advantages of this configuration include:

•A measure of common-mode noise attenua- tion, since the isolation (common-mode rejec- tion) occurs as close to the load as practical (i.e. at the PDU).

•The UPS module can be located remotely from the PDU without compromising com- mon-mode noise performance.

•By using UPS modules with 480 VAC input and output and creating 208 VAC at the PDU, smaller and less costly power feeders can be used and less voltage drop (as a percent of nominal) occurs.

NOTE

Impedance-grounded wye sources must be grounded in accordance with Section 7.5.

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Emerson SERIES 600T manual 8Installation Manual
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SERIES 600T specifications

The Emerson SERIES 600T, as part of the SERIES 600 line, is a sophisticated device designed to meet the demands of industrial automation and control systems. Renowned for its reliability and versatility, the SERIES 600T excels in various applications across multiple sectors, including oil and gas, chemical processing, and power generation.

One of the most significant features of the SERIES 600T is its advanced measuring capability. It offers exceptional accuracy, typically within ±0.1% of the full scale. This precision makes it suitable for critical applications where measurement integrity is paramount. The SERIES 600T is also equipped with intelligent diagnostics that can predict and monitor the health of the unit, enabling proactive maintenance and minimizing downtime. This technological advancement improves both operational efficiency and safety.

Another standout characteristic is the device's robust construction designed to withstand harsh environments. The SERIES 600T is made with durable materials that provide resistance to corrosion, vibration, and temperature extremes, making it an excellent choice for rugged industrial applications. Coupled with its IP67 rating, the device is fully sealed against dust and moisture, ensuring long-term reliability in challenging conditions.

The SERIES 600 line employs cutting-edge communication protocols, including HART and Foundation Fieldbus, facilitating seamless integration into various control systems. This capability ensures that users can easily access real-time data and manage devices remotely, significantly enhancing operational efficiency.

Additionally, the SERIES 600T supports a wide range of process connections and configurations, catering to diverse installation needs. This adaptability allows for quick deployments and minimizes the time required for system changes or upgrades.

With easy-to-read displays and user-friendly interfaces, operators can quickly interpret data and metrics from the SERIES 600T. This intuitive design helps reduce the learning curve for new users, further underlining the device's legacy of reliability and efficiency.

In essence, the Emerson SERIES 600T exemplifies cutting-edge technology in the realm of industrial measurement and automation. Its combination of accuracy, durability, diagnostic capabilities, and ease of integration makes it an ideal choice for industries that prioritize reliability and precision in their operations. As industrial processes continue to evolve, devices like the SERIES 600T will undoubtedly play a crucial role in advancing efficiency and productivity in various sectors.
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