Selection of an electrical fire monitoring system on Chinese low-voltage distribution is governed by GB 14287.1-2014 for the host equipment and GB 14287.2-2014 for the residual-current detector, both of which were re-confirmed in the 2026-02-04 and 2026-06-09 standardisation references [S3][S1]. The two-part standard split is the first gate: anything billed as an "electrical fire monitoring system" must pair a GB 14287.1 host with GB 14287.2-compliant field detectors, otherwise the installation does not pass the local fire-protection acceptance review.
GB 14287.2-2014 formally defines the residual-current electrical fire monitoring detector as a device that monitors the residual current in the protected circuit and is "generally composed of a residual current sensor and a signal processing unit" [S3]. That sensor-plus-signal-processing architecture is what separates a true GB 14287.2 detector from a generic RCCB/RCBO residual-current breaker, and the distinction is the reason most low-voltage cabinets now carry both: a breaker for disconnection plus a GB 14287.2 detector for trend logging and alarm.
Detector classes, alarm ranges, and where each one fits
GB 14287.2-2014 covers the residual-current (leakage) detector, while GB 14287.1-2014 covers temperature-sensing (thermal) detectors in the same host system [S1][S3]. On a 400 V three-phase four-wire feeder, the residual-current detector is the primary pick because cable insulation degradation, terminal oxidation, and N-line imbalance all show up as a slowly rising earth-leakage current long before they reach thermal-runaway conditions.
The detector must also report both the trip threshold and the actual measured value to the host, which is what enables the trend-logging that distinguishes a fire-monitor from a plain RCD.
For busbar and cable-joint monitoring, GB 14287.1-2014 specifies a separate temperature-sensing detector with an upper monitoring range that commonly reaches 0–140 °C [S2]. This is the correct choice where load current is steady but connections are the failure mode — busbar joints, drawer-type cubicle contacts, and dry-type transformer low-voltage bushings — because a joint resistance rise of even 20 mΩ at 400 A dissipates 3.2 W locally and will not move the residual-current reading at all.
Independent vs non-independent detector architecture
GB 14287.2-2014 draws a hard line between independent and non-independent detectors, and the choice is driven by cabinet layout [S3]. An independent detector has its own display, alarm, and trip outputs and can be installed on a single outgoing circuit; a non-independent detector only senses and reports back to the GB 14287.1 host, with all display and alarm logic centralised.
For small distribution boards under 8 ways, non-independent detectors are the cost-effective pick and reduce wiring to a single four-core bus. For larger floor-by-floor risers, mixing independent detectors on each tenant feeder with a non-independent summary detector on the main breaker gives both local fault-finding and central reporting. Shanghai Jindun's product manual lists this exact combination — modular electrical fire detector plus a fire power monitoring system host — as a standard build [S2].
Selecting the wrong class is a common failure mode: installers specify non-independent detectors on circuits where local disconnection is required, and the host then has to carry a tripping contactor, which defeats the modular advantage. The GB 14287.2-2014 definitions are explicit: a non-independent detector "can detect residual current in the protected circuit and transmit related information to the electrical fire monitoring equipment" — it does not, by definition, actuate a breaker on its own [S3].
Where GB 14287 does and does not apply
GB 14287.1-2014 and GB 14287.2-2014 are written for 1 kV and below AC distribution, which covers the bulk of building and industrial low-voltage work [S1]. For medium-voltage switchgear above 1 kV, the residual-current principle still applies but the detector and host are not within GB 14287 scope, and distributed fibre-linear heat detection on the busbar surface is the typical substitute in Chinese MV cubicles.
The two standards are also not a substitute for automatic fire alarm (FA) and gas-extinguishing systems. A GB 14287 system is an early-warning layer that catches insulation and joint faults before ignition, while FA systems handle smoke and heat detection post-ignition and gas systems handle suppression. Procurement specifications that bundle GB 14287 monitoring with fire extinguisher cabinets, fire door monitoring, and gas-extinguishing control are now standard on Class A office and data-centre projects [S2].
For a process plant or hazardous area, the GB 14287 envelope is still the electrical layer, but the cabinet must also satisfy GB 50058 for hazardous-area zoning and any explosion-proof electrical requirements on the detector housing. Selecting a GB 14287.2 detector that lacks the right Ex marking is a common mistake when the feeder runs through a Zone 1 paint booth or solvent store.
Comparison of detector options against four decision criteria
The three realistic options for an electrical fire monitoring detector on a 400 V feeder can be lined up against four decision criteria: applicable voltage, measurable signal, alarm range, and whether the device trips locally. Residual-current detectors per GB 14287.2-2014 cover 0.4 kV and below with 20–1100 mA settable alarms and a non-tripping default (trip only via host) [S3]. Temperature-sensing detectors per GB 14287.1-2014 cover 0.4 kV and below with 0–140 °C and a non-tripping default, used where leakage is not the dominant failure mode [S1][S2].
Combined residual-current plus temperature detectors in a single housing cover 0.4 kV and below with both 20–1100 mA and 0–140 °C ranges and a non-tripping default, but they cost roughly 1.5–2× the single-function unit and are worth specifying only on critical feeders such as data-centre PDU incomers or ICU distribution. Independent residual-current detectors with their own display and trip output sit at the top of the range and are the right pick for tenant metering cabinets where the local user must see the trip cause before central engineering arrives.
A practical decision tree is: start with voltage level (≤1 kV: GB 14287 in scope; >1 kV: fibre-linear heat or other MV-rated detector); then with failure mode (insulation leakage: residual-current detector; joint overheating: temperature detector; both: combined unit); then with cabinet size (≤8 ways: non-independent; >8 ways or multi-tenant: independent on each feeder); and finally with hazardous-area zoning (Zone 1 or 2: add the correct Ex marking to whichever detector is selected).
Integration with power monitoring, fire alarm, and condition monitoring
An electrical fire monitoring system is rarely specified as a standalone system in 2026; it is typically integrated with a power monitoring system that reads the same CTs and reports load current, voltage, and energy. The GB 14287.1 host then supplies the fire-relevant subset — residual current and temperature — to the same upstream platform, so the operations team sees a single dashboard rather than two parallel systems [S2].
On rotating equipment and motor-control centres, the fire-monitor's temperature channels double as a condition monitoring system input: a bearing housing or cable gland that drifts from 60 °C to 95 °C over six weeks is a maintenance event, not a fire event, and the platform should be configurable to route that trend to the maintenance work order. This is where the "fire" and "condition" monitor layer merge into a single temperature-mapping workflow on the same detector.
For cabinets that also contain a smoke or gas detection layer, the electrical fire monitor becomes one node on a multi-hazard panel: smoke, gas, residual current, and temperature all report to the same host, which then arbitrates whether the event is a fire, a fault, or both. The signal logic is set in the GB 14287.1 host configuration and must be documented for the fire-protection acceptance review.
Acceptance documentation and procurement checklist
Procurement should require a current GB 14287.1-2014 host certificate and a current GB 14287.2-2014 detector certificate from the same vendor, plus a type-test report covering alarm accuracy, trip time, and communication protocol. The 2026-06-09 standard reference confirms GB 14287.1-2014 is in "现行" (active) status and is the current binding version for compliance review [S4][S1].
For ongoing work, track two signals: any revision notice published on openstd.samr.gov.cn for GB 14287.1 or GB 14287.2, and any new GB 14287.x part (parts 3 and onwards) covering arc-fault detection, which has been a draft topic in the Chinese fire-protection standards community. For selection guidance on adjacent fire-protection and detection hardware, see the flame detector vs gas detector spec map and the smoke detector vs gas detector spec map.