The Form 5S meter is a widely used tool for monitoring energy consumption in three-phase, three-wire systems, making it ideal for certain commercial and industrial applications. Understanding its wiring configuration is essential for proper installation and accurate energy measurement. This blog post accompanies a detailed wiring diagram above of the Form 5S meter when used in a 3 phase, 3 wire delta system without PTs, explaining its key components and connections. If the voltage you are working on is over 240v, it is recommended that PTs are used in conjunction with the CTs to lower the voltage you are exposed to. Also, make sure that your meter is rated for the voltage it will be subjected to.
Overview of the Form 5S Meter
The Form 5S meter is a meter form designed to measure electricity in systems with two hot phases and a neutral. This setup is common in medium-sized commercial settings, such as small manufacturing plants and retail stores, where a three-phase power supply is necessary for equipment or lighting systems. The meter can be self-contained or transformer-rated, depending on the load requirements. The meter base is an eight terminal meter base.
Key Features of the Wiring Diagram
- Voltage Connections
The voltage inputs are connected to the two hot phases and, the third hot phase which is commonly referred to as the common. These connections ensure the meter can accurately measure voltage levels in the system. - Current Transformer (CT) Connections
For transformer-rated meters, the wiring diagram includes CT connections labeled X1 and X2 for each phase. These transformers reduce high currents to measurable levels, allowing the meter to accurately calculate energy usage. - Line and Load Connections
The diagram highlights the current flow from the line side (source) to the load side (equipment). Properly connecting the line and load ensures the meter records consumption accurately.
How to Use the Wiring Diagram
When installing or troubleshooting a Form 5S meter, the wiring diagram acts as a guide to ensure all connections are correct. For transformer-rated systems, pay close attention to the CT placement and polarity (X1 and X2) to avoid measurement errors.
Applications of the Form 5S Meter
The Form 5S meter is commonly used in:
- Small manufacturing facilities
- Retail stores with three-phase loads
- Commercial buildings with medium power demand
- Pumps
- 3 phase, 3 wire Delta systems
Its flexibility and reliability make it a trusted choice for measuring energy in these environments.
Conclusion
Accurate wiring is essential for the proper functioning of a Form 5S meter. Whether you’re installing a new meter or troubleshooting an existing one, the accompanying wiring diagram provides a clear and detailed guide to ensure everything is set up correctly. By following the diagram, you can maximize the accuracy and reliability of your energy measurements. As always, verify everything before energizing.
For more detailed guidance, refer to the wiring diagram provided above!
