How is the interval meter connected to the electrical system?

The interval meter is typically connected to the electrical system through a current transformer (CT) and potential transformer (PT). The CT is connected to the main electrical supply line to measure the current flowing through it, while the PT is connected to the voltage supply line to measure the voltage. These transformers step down the current and voltage to levels that can be safely measured by the meter.

The interval meter is then connected to the CT and PT to measure the current and voltage at regular intervals, typically every 15 minutes. This data is used to calculate the energy consumption of the electrical system over a specific period of time. The interval meter may also be connected to a communication network to transmit this data to a central monitoring system for analysis and billing purposes.

Connecting an Interval Meter to the Electrical System

Step 1: Identify the Meter Panel

- Locate the electrical panel or breaker box in your home or business.
- Look for the main electrical disconnect switch.
- Turn off the main disconnect switch to prevent any accidental electrical shocks.

Step 2: Install the Current Transformers (CTs)

- The interval meter requires current transformers to measure the electrical current flowing through the system.
- Wrap the CT primaries around the main electrical wires entering the panel.
- Follow the manufacturer's instructions for proper installation.

Step 3: Connect the CTs to the Meter

- Run the wires from the CT secondaries to the interval meter terminal block.
- Connect the wires according to the meter's wiring diagram.

Step 4: Install the Voltage Sensor

- The interval meter also needs a voltage sensor to measure the electrical voltage.
- Connect the voltage sensor to the terminal block on the meter as per the wiring diagram.

Step 5: Power the Meter

- Turn on the main electrical disconnect switch to restore power to the system.
- The interval meter should power up and start recording consumption data.

Step 6: Set Up Communication

- If the interval meter has communication capabilities, set up the necessary communication protocols (e.g., Ethernet, cellular).
- This will allow the meter to transmit data to the utility or monitoring system.

Additional Considerations:

- Use the correct size of CTs for the expected electrical current.
- Ensure that all connections are secure and insulated properly.
- Follow all safety precautions and consult an electrician if needed.
- Check the manufacturer's instructions for specific connection details and troubleshooting tips.