3 Phase Meter Connection Diagram
Learn the correct wiring connection for a 3-phase meter with step-by-step guidance, ensuring safe and accurate power measurement for 3-phase electrical systems.
3 phase power meter connection
Under 3-phase meter connection wiring, the connections of the three-phase conductors (L1, L2, L3) are connected to the respective meter terminals together with neutral (in case of its necessity). With this system, it is possible to accurately measure total power used in all phases using the meter. Proper wiring and phase sequence are very important in ideal operation and proper billing.
3 Phase Meter Wiring Formula & Summary:
Voltage (V): 400V line-to-line, 230V line-to-neutral
Current (I): Load current per phase
Power (P):P = √3 × V_L-L × I × Power Factor
Wiring Connections: L1, L2, L3 → Meter input terminals; Neutral → Meter neutral terminal (if required)
Three-phase meter installation
The 3-phase meter connection wiring is the ability to plug the three-phase lines (L1, L2, L3) and a neutral wire (N) to a three-phase energy meter. This meter gauges the use of the electrical energy in three-phase applications that are common in commercial and industrial environments. The line of each phase is joined to the input terminals of the meter, and the output terminals go to the load side. Connected neutral is that which the meter needs to measure, or in order to be safe. The wiring should be properly done to have the right phase connection and order without wrong readings or damage to the meter. There are also protective devices and grounding. This guide discusses the following aspects of metering three-phase power: the terminals in shows and wires, and the type of cable to use, as well as safety measures to take in ensuring efficient and reliable metering.
3-phase meter connection
| Terminal | Connection | Description |
|---|---|---|
| L1 Input | Phase 1 line from supply | First phase connection |
| L2 Input | Phase 2 line from supply | Second phase connection |
| L3 Input | Phase 3 line from supply | Third phase connection |
| Neutral (N) | Neutral line from supply | Neutral connection for meter/load |
| Load Side Outputs | To a 3-phase load | Supplies power to the load |
Frequently Asked Questions - 3 Phase Meter Connection Diagram:
What are the main terminals in a 3 phase meter wiring?
The main terminals are L1, L2, L3 for the three phases, Neutral (N), and load side outputs.
Is neutral always required in 3 phase meter wiring?
Neutral is required if the system or meter needs it for accurate measurement or safety.
Can wrong phase sequence affect meter readings?
Yes, incorrect phase sequence can cause inaccurate readings or damage.
What voltage does a 3 phase meter measure?
It measures line-to-line voltage (400V) and line-to-neutral voltage (230V).
What wire size is recommended for 3 phase meter wiring?
Typically, 10mm² or 16mm² depending on load and regulations.
How is power calculated in a 3 phase system?
Power P = √3 × Voltage line-to-line × Current × Power Factor.
Can a 3 phase meter be used for single phase?
No, a single phase meter is used for single phase loads.
What safety precautions should be taken during installation?
Switch off power, use insulated tools, and follow local electrical codes.
Can multiple loads be connected after the meter?
Yes, loads are connected in parallel after the meter on the load side.
What happens if a phase is not connected properly?
It may cause meter malfunction or incomplete power measurement.
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