HMI & SCADA Systems in Metering & Monitoring Panel

Most metering and monitoring panels use industrial HMIs from 7 to 15 inches, selected based on the number of feeders, meters, and alarm points to be displayed. A 7-inch touchscreen is common for compact submetering boards, while 10- to 15-inch panels are preferred where trends, single-line diagrams, and multiple energy dashboards must be shown simultaneously. The HMI should have an IP65 front, 24 VDC supply, fanless construction, and sufficient brightness for electrical rooms. Under IEC 61439-1, the panel builder must also account for heat dissipation, wiring space, and accessibility. For higher integration, the HMI is often paired with Modbus TCP/RTU gateways and multifunction meters compliant with IEC 61557-12.

SCADA integration is typically achieved through Ethernet or serial communication gateways connected to multifunction meters, protection relays, and PLC I/O modules. Common protocols include Modbus TCP, Modbus RTU, BACnet, Profinet, and IEC 60870-5-104, depending on the BMS or utility interface. The panel design must ensure correct segregation of power and communication wiring, proper shielding, earthing, and EMC control in line with IEC 61439-1. Where the assembly includes managed switches or protocol converters, their power consumption and thermal load must be included in the temperature-rise assessment. Secure user access, event logging, and time synchronization are also essential for reliable SCADA data reporting.

The main assembly standard is IEC 61439-1 and IEC 61439-2 for low-voltage switchgear and controlgear assemblies. The HMI itself is not certified under IEC 61439, but its integration must comply with the assembly rules for temperature rise, dielectric performance, wiring, and short-circuit coordination. For metering devices, IEC 61557-12 is commonly relevant for energy and power quality measurement. Communication interfaces should be assessed for EMC and application suitability, while associated protection devices such as MCCBs or ACBs must comply with IEC 60947-2. In hazardous locations, IEC 60079 may apply, and where arc fault containment is a design requirement, IEC/TR 61641 can be considered.

A metering and monitoring panel commonly reads status and measurements from MCCBs, ACBs, MCBs, motor protection devices, protection relays, energy meters, and sometimes ATS controllers or generator controllers. The SCADA layer can capture breaker trip status, alarms, breaker position, current, voltage, frequency, power factor, demand, and kWh. When the panel is part of an LV main switchboard or sub-distribution board, the monitoring points should be defined early so that CT ratios, digital inputs, and communication mapping are correctly engineered. Devices such as ACBs and MCCBs should comply with IEC 60947-2, and the overall assembly must remain within the current-carrying and short-circuit withstand limits declared under IEC 61439-1/2.

Thermal management is critical because HMIs, industrial PCs, Ethernet switches, power supplies, and gateways add continuous heat load to the enclosure. The panel builder should calculate total losses and compare them with the enclosure’s allowable temperature rise under IEC 61439-1. Fanless devices, 24 VDC power supplies with high efficiency, and appropriately sized ventilated or air-conditioned enclosures are preferred where ambient temperatures are elevated. Placement also matters: heat-generating components should be separated from sensitive displays and communication modules, with clear cable routing and air circulation paths. If the board contains dense metering hardware or is installed in a hot electrical room, derating and environmental class selection become essential for long-term reliability.

Yes. This is one of the most common applications for a metering and monitoring panel. The HMI provides local visualization of feeder loads, demand, kWh, kvarh, power factor, and harmonic data, while the SCADA layer aggregates information from multiple energy meters for tenant billing, plant energy optimization, and utility reporting. Multifunction meters compliant with IEC 61557-12 are typically installed on each outgoing feeder, with CTs sized to the load. In commercial buildings, hospitals, and factories, this architecture supports BMS integration, peak demand control, and abnormal consumption alarms. The panel should be engineered so the communications network, metering accuracy, and supply protection remain reliable and maintainable.

The full assembly short-circuit rating must be checked first, including the busbars, incoming device, and internal distribution system under IEC 61439-1. Depending on the application, the declared withstand may be 25 kA, 36 kA, 50 kA, or higher for 1 second, or an equivalent peak current rating. In addition, the control supply components supporting the HMI and SCADA system, such as MCBs, fuses, 24 VDC power supplies, and terminals, must be suitably protected against fault energy. Communication modules are usually not short-circuit rated as power devices are, so they must be installed within the protective envelope of the assembly. The panel documentation should clearly state the coordinated ratings and test basis.

A typical configuration includes an incoming protective device such as an MCCB or ACB, multifunction meters on key feeders, CTs and voltage sensing circuits, a 24 VDC auxiliary supply, industrial HMI, communication gateway, managed Ethernet switch, and remote alarm outputs. Larger systems may also include a PLC, UPS for ride-through, and interface modules for BMS or cloud monitoring. The arrangement should be designed in accordance with IEC 61439-2, with suitable form of separation, clear wiring segregation, and accessible terminal blocks for testing and maintenance. For utility-style or plant-wide monitoring, redundant communications and time-stamped event logging are often added to improve reliability and diagnostics.