# Instance: 2.6 + 3.5.3 — BMS Power-Monitoring Interfaces

Module: [bms/field-devices-power](../../../_playbook/modules/bms/field-devices-power.md)
WBS leaves: 2.6 (supply), 3.5.3 (installation)

## Project-specific values

- **Power meters monitored (per A2 / A1):** 8 — PM-MAIN-LG (main), PM-CHILLER, PM-COOLING, PM-AIR-2F, PM-AIR-GF, PM-CASINO, PM-BOILER, PM-PLUMB, PM-FIREPMP.
- **HLI mode:** Modbus RTU daisy-chain back to PNL-PM-LG gateway; PNL-PM-LG bridges Modbus → BMS BACnet/IP.
- **Meter supply scope:** Equipment Supplier provides Modbus-equipped meters at switchgear (`A-018` / Q-020). BMS Contractor terminates Modbus at meter side and configures gateway.
- **Per-feeder data points per A1 `pm_feeder` template:** V (3φ) + I (3φ) + kW + kWh; main meter additionally includes kVAR, PF, frequency.
- **Modbus bus segmentation:** 2 buses to keep total drop count < 16 per bus (A-018-bis).

## Quantities driving BOQ

- 1× Modbus gateway in PNL-PM-LG.
- Modbus shielded twisted-pair cable (~250 m total — per A3).
- Manhours per B4 — ~40 hr (gateway + commissioning + meter address mapping).