Surge Protective Devices

PARALLEL CONNECTIONS

Typical Parallel Connections (without Internal Rotary Disconnect)

Ground

Phases

Neutral

 

 

 

 

 

 

To

 

 

 

 

Protected

 

 

 

 

Loads

 

 

 

Neutral

 

 

 

 

 

Surge

 

 

 

Phase(s)

Protective

 

 

 

Device

 

 

 

Transient

 

 

 

 

Ground

 

Protected

 

Safety

 

 

Panel

Wire should be

Ground

 

 

 

 

 

 

less than 5 feet

 

 

 

 

and straight

 

 

 

 

as possible

 

 

Typical Parallel Connections

(with Internal Rotary Disconnect)

Ground

Phases

Neutral

 

 

 

 

 

 

To

 

 

 

 

Protected

 

 

 

 

Loads

 

 

 

Neutral

Surge

 

 

 

 

 

 

Rotary

 

Protective

 

 

Phase(s)

Device

 

 

Disconnect

 

 

 

 

 

 

Transient

 

 

 

 

Ground

 

Protected

 

Safety

 

 

Panel

Wire should be

Ground

 

 

 

less than 5 feet

 

 

 

 

and straight

 

 

 

 

as possible

 

 

Grounding conductors must be routed with the associated power conductors in the same raceway (conduit). When metallic raceways are used, adequate electrical continuity must be maintained at all raceway connections, particularly raceway terminations to the electrical enclosures.

The use of isolating bushings or other means to interrupt a metallic conduit run is a potential safety hazard and is not recommended.

Grounding Electrode Surge protective devices do not discharge all surges to ground (earth). Surge protective devices can also divert the surge current back to its source to complete the electrical circuit.

In the case of lightning whose potential is developed with respect to the earth, the SPD diverts the surge current to the grounding electrode (earth connection). However, for most transient surges that are developed by switching loads, the SPD diverts the surge current back to its source without involving the grounding electrode.

For proper SPD performance, the service entrance grounding electrode system must comply with the NEC by having all available electrodes (building steel, metal water pipe, driven rods, concrete encased electrodes, etc.) properly bonded together and connected to the power system grounding.

The use of a separate grounding electrode to ground the SPD defeats the effectiveness of the SPD, is a potential safety hazard, may cause equipment damage, is an NEC violation (reference NEC 250-51 and 250-54), and is not recommended.

Neutral Connection

FOR PROPER AND SAFE

OPERATION, THE SPDs

NEUTRAL, MUST BE

RELIABLY

CONNECTED TO THE NEUTRAL OF THE SOURCE. FAILURE TO PROVIDE A RELIABLE NEUTRAL CONNECTION MAY RESULT IN FAILURE!

Installation, Operation and Maintenance Manual

5

IO-70103 Rev 0, 1/2013

Page 6
Image 6
Emerson 510 manual Parallel Connections, Neutral Connection

510 specifications

The Emerson 510 is a cutting-edge, versatile automation controller designed to enhance operational efficiency, improve productivity, and ensure seamless management across various industries. Known for its robust architecture, the Emerson 510 integrates a host of features and technologies that cater to the demands of modern automation processes.

One of the standout characteristics of the Emerson 510 is its modular design, which allows users to customize their systems according to specific application requirements. This flexibility ensures that businesses can scale their operations without having to invest in entirely new systems. The controller supports a variety of I/O modules, communication cards, and power supplies, making it suitable for a wide range of industrial applications, from manufacturing to processing plants.

The Emerson 510 is powered by advanced technologies that promote faster data processing and enhanced connectivity. It features an intuitive user interface that simplifies programming and monitoring, allowing operators to interact with the system effortlessly. The controller also supports various programming languages, including Ladder Logic and Structured Text, catering to the preferences of different users and ensuring that system integration is as smooth as possible.

Another significant advantage of the Emerson 510 is its real-time data acquisition and processing capabilities. This functionality enables operators to monitor system performance, receive alerts, and make data-driven decisions to optimize operations. The controller’s networking capabilities allow for seamless integration into larger control systems, facilitating communication with other devices and systems, such as SCADA and HMI platforms.

Security is a critical aspect of modern industrial control systems, and the Emerson 510 addresses this concern with robust cybersecurity features. It incorporates advanced encryption protocols, user authentication, and access controls to ensure that the system remains protected against potential threats and vulnerabilities.

In conclusion, the Emerson 510 automation controller stands out in the industry with its modular design, advanced processing capabilities, user-friendly interface, and strong security features. It empowers businesses to enhance operational efficiency, streamline processes, and drive innovation, making it an invaluable asset for any organization looking to thrive in an increasingly competitive landscape.