FREQUENTLY ASKED QUESTIONS

It is designed to meet ASHRAE 90.1 Section 8.4.3 Electrical Energy Monitoring Requirements and IECC C405.12 Electrical Energy Monitoring and End-Use metering categories commercial buildings requirements, and other specified codes requiring end-use system monitoring and data aggregation.

Measurement devices shall be installed in new buildings to monitor the electric energy use for each of the following load type separately: HVAC systems, Interior Lighting, Exterior Lighting, Receptacle Circuits, Refrigeration Systems etc. Optional loads such as Process, EV charging or data centers can also be included. *Accuenergy will review project plans and identify the required groupings based on the specific code the Engineer of Record notates on the drawing.

Yes. Accuenergy provides suggested takeoffs with marked up one-lines and panel schedules showing the CTs placement, CT counts and AcuEASI board layouts- all the details needed for a complete suggested code compliance bill of materials.

Our AcuPanel EASI provides the owners with an integrated metering system with multi circuit meters networked to a centralized head end data logger and gateway device for access the data versus having to retrieve raw data from each individual meter scattered throughout a facility. With this easier solution, the AcuEASI system offers the ownership a centralized data management device with the AcuHMI resulting in fewer network drops to devices and vastly simplifying the commissioning process for the contractors while providing a programmed code-compliant reporting platform without expensive data usage fees.

Yes. The system supports both engineer-specified projects and contractor-driven value engineering or design-build substitution.

Dual Ethernet RSTP daisy chain bridge requires 300 ft between devices, maximum 32 devices to the AcuHMI. Or, the Modbus RTU RS485 daisy chain can run to 4,000 feet to the AcuHMI, also maximum 32 devices per daisy chain. Either works. Accuenergy can advise and assist the contractor on determining the best topology per project.

Yes. The AcuRev 4100 supports both Cat6 RJ45 Ethernet daisy-chain networking and traditional 3-wire shielded RS485 connections. The dual Ethernet daisy chain reduces termination errors, labour time, and troubleshooting complexity.

No. A key advantage of our system is that the AcuPanel EASI multi circuit meters can be daisy chained together (either dual ethernet cat 6 patch cable or RS485 Belden 1120a twisted shielded or equal) needing only one network drop to the AcuHMI.

Typically inside UL Listed NEMA4X enclosure, located adjacent to electrical distribution panels in electrical rooms.

Yes. As a standard part of our code metering services offering, Accuenergy provides for onsite commissioning services to include system start up and hardware programming for the purpose of labeling the circuits based on configuration forms provided by the installing contractor. We also provide remote programming should that be preferred.

Circuits are assigned into end-use groups when programmed in to the AcuHMI. Programming is based on the configuration form that must be filled out and submitted by the installing contractor for every multi circuit meter. Our team will group system end use categories such as interior lighting, exterior lighting, and receptacles, HVAC, etc. as custom aggregated totals in the AcuHMI. Making the reporting much easier for the owner as they do not need to spend hours manually downloading raw data spreadsheets trying to analyze individual circuit data.

No. The owner does not have to hire programmers to provide custom reporting with the metered data. Accuenergy provides the programming as part of the project and it is based on the configuration provided by the contractor. Once the system is programmed by Accuenergy, the data accessible remotely at no additional charge using a browser and Web Interface or directly through the HMI touchscreen interface.

The system uses 333 mV output CTs, which are low voltage, safe to handle, and ideal for multi-circuit monitoring in commercial submetering applications.

The current transformers are in compliance with NEC and inspection requirements. Each CT are UL Recognized and UL Listed with 333 mV output for safe installation.

333 mV CTs are safer, with low secondary current, carry no risk of dangerous open-circuit voltage, and feature smaller wire size for easier termination. Ideal for distributed, multi-circuit installations.

CTs appropriate to the application are provided. The CTs are UL Recognized and UL Listed. CTs with 333 mV output are used for safe installation. Accuenergy ensures compliance with NEC and inspection requirements.

The white lead is positive and connects to X1. The black lead is negative and connects to X2 or the corresponding polarity terminals on the meter.

UL Listed covers fully certified, standalone products approved for field installation. UL Recognized applies to components used within larger equipment and not intended for standalone installation.

CT dimensions are provided in product datasheets available on the Accuenergy website.

Accuenergy will determine the size the CT as part of the takeoff. I will be based on breaker size and conductor sizing, ensuring proper accuracy and headroom.

Slight oversizing is acceptable, but excessive oversizing can reduce accuracy at low loads. Accuenergy will size CTs appropriately to avoid this.

Typically, one CT is installed around one phase of the conductor. Follow the provided wiring diagram and CT polarity labeling to maintain proper phase orientation. The CT arrow or polarity marking should point toward the load and routed back to the meter using a low-voltage wiring.

Yes, each measured circuit requires one CT per phase and typically three per 3-phase circuit.

Solid-core CTs require the conductor to be disconnected, whereas split-core CTs can be installed without disconnecting power, so it can be used for retrofit applications.

Yes. Typical extension distances range up to 100–200 feet. Longer distances is possible with proper cable sizing and installation practices. Shielded twisted pair cable is recommended, but parallel CT wiring is not recommended. Separate routing is recommended to reduce electrical noise and improve signal accuracy.

Excessive distance can reduce signal accuracy and introduce noise. Proper cable selection and routing can help maintain signal integrity.

Voltage reference is required to accurately calculate real power (kW) and energy consumption (kWh).

Voltage is typically sourced from the same panel or circuit being monitored and connected directly to the meter voltage inputs.

If the reference voltage wiring is not connected, the panel cannot accurately calculate real power (kW) or energy values (kWh) and lead to incomplete or incorrect data.

Inline fuses help protect meter voltage inputs and installers during commissioning.

Inline fuses are installed on the leads of the voltage reference that feeds to the meter and between the source voltage and the meter inputs.

Dedicated 3 pole breakers are installed in the panel for safety compliance and equipment protection.

Not required for safety like 5A CTs, but shorting blocks are recommended for serviceability which helps during maintenance and troubleshooting.

Common mistakes include incorrect CT polarity, incorrect CT size, missing voltage reference, improper routed wiring, and mixing the phase coordination.

Follow provided diagrams, label circuits clearly, verify polarity before energizing, use provided support if unsure.

No. AcuHMI is typically wall-mounted or panel-mounted in an accessible location.

A centralized AcuHMI system is designed to simplify installation, commissioning, and long-term use, especially on multi-panel and code-driven projects.

Comparison between the AcuHMI centralized approach and traditional distributed systems.

The AcuHMI provides a complete data onsite reporting system, which is immediately accessible, reducing the risk of delays often associated with meters pushing data to cloud-dependent platforms.

The following table provides a direct comparison to help distinguish between the monitoring architectures.

AcuHMI is a central head-end device that collects data from all meters such as the AcuRev 4100, stores interval data, provides local user touchscreen interface, and supports reporting and export functions.

Commonly installed in a clean, accessible locations including electrical rooms, main switchgear, IT or telecom rooms. It can be panel-mounted or wall-mounted near distribution equipment.

Typically the electrical contractor, with light coordination from IT for network connection.

Recommended best practices include following wiring diagrams, labelling circuits clearly, verifying polarity before energizing, and project coordination support with Accuenergy.

AcuHMI is connected using a standard CAT6 Ethernet cable. A single cable from the AcuHMI is used to connected to the building network switch.

No. The network switch is typically provided by the building’s IT infrastructure. The contractor pulls the CAT6 cable to the designated network drop.

An IT professional can be requested to install a drop by extending CAT6 from the nearest switch. In some cases, it can use a small dedicated switch.

No. Only the AcuHMI connects to the building network. All the other meters are connected through daisy-chain to the AcuHMI.

Yes. One static IP address is typically recommended.

No. Meters are networked internally through the AcuHMI. No additional IT involvement required.

HTTP uses port 80 and HTTPS port 443. Remote access needs outbound ports are required depending on configuration.

For local operation, it is not usually required when within the building network. Remote access can be configured based on IT policy.

Yes. Remote viewing and export can be configured based on IT policies; it may require VPN access or specific outbound port allowances.

No. The system operates fully as a local solution. Cloud or remote access is optional.

AcuHMI is accessible directly through the HMI touchscreen interface or through a browser Web Interface using the IP address.

No. Only a standard web browser access is supported. No licenses required for local use.

Yes. Accuenergy supports startup and configuration. Contractors perform the actual physical installation. Minimal IT co-ordination is required during this process.

The AcuHMI stores long-term interval data for several years depending on configuration. It will also store the historical data and grouped circuit data.

Yes. Reports can be exported in Excel or CSV format.

Yes. Data remains stored locally even during network interruptions.

Electrician installs system and IT provides the network drop and IP address.

No. It is not a complex network architecture. The system can be installed by IT using one network drop and configuring a single IP address.

To avoid hindrances, plan to coordinate the network drop early, avoid installing AcuHMI too far from network access and not assigning an IP address.

Yes. The system provides local touchscreen access, exportable reports and optional remote and cloud access.

The available data from system includes kWh energy consumption, kW demand at 15-minute intervals, and historical trends.

The AcuHMI can store long-term interval data for several years.

Yes. The owner can access reports through the built-in interface. No subscription is required for local access.

Yes. The AcuHMI system can export time and energy stamped data for use with third-party billing providers.

The AcuHMI can generate CSV files with interval data typically 15-minute or every hour kWh. Data can be organized by tenant, panel, or virtual grouping. Files can be pushed to designated servers based on a schedule for automatic exports.

Yes. AcuHMI can be configured to push either .CSV or .JSON files on scheduled basis: daily, weekly, monthly based on project requirements, deliver data via network transfer. This allows seamless integration of AcuHMI with third-party billing platforms.

No. The CSV is an open file format. It is compatible with virtually all billing and energy management systems.

Using the AcuHMI, circuits can be grouped into virtual meters and assigned to tenant units during programming. This allows accurate aggregation across multiple panels and clean data output for billing providers.

No. The AcuHMI provides the metering data foundation while third-party billing providers manage invoice generation, tenant billing compliance, and rate structures.

Yes. When properly installed and configured, the panel uses revenue-grade metering hardware and records data at regular interval to support standard billing practices. Accuenergy can coordinate with billing providers to meet data requirements.

Benefits include no mandatory subscriptions, local data ownership, flexible integration with preferred billing provider, and immediate local data access.