Wire & Cable Fire Resistance Test Machine: Proving Circuit Integrity at 830°C
Thirty minutes into a fire, is the alarm still ringing?
In a real fire, what people fear most usually isn’t the flames themselves — it’s the systems failing. Sprinklers that never kick on. Alarms that go silent. Emergency lighting that cuts out right when it’s needed most. Whether those systems hold up often comes down to something easy to overlook: the wires and cables running through the walls and along the cable trays, and whether they can keep the circuit intact while being burned, sprayed with water and hit with mechanical shock all at once. That is the entire point of fire-resistant cable — and exactly why fire safety systems, rail transit, nuclear power and marine applications, where the safety bar sits especially high, are so strict about cable fire resistance testing.
As a professional manufacturer of fire testing instruments and material testing equipment, Baoruitong Automation Equipment Co., Ltd. (BRT) presents this guide to cable fire resistance testing and introduces the NH-016 Wire & Cable Fire Resistance Test Machine — engineered to turn “fire-resistant” from a spec-sheet claim into hard, certification-ready data.
Why Cable Fire Resistance Testing Matters
The real question is how to actually prove a cable is fire-resistant — not through a claim on a datasheet, but through standardized data from a proper burn laboratory. Under GB/T 19216.21, 19216.23 and 19216.25, a cable must maintain circuit continuity while exposed to an open flame at no less than 830 °C, while simultaneously weathering water spray and mechanical impact, with circuit continuity monitored throughout the entire test.
The principle sounds simple, but it demands a lot from the equipment: can the combustion chamber hold high temperature steadily? Is the gas circuit precisely controlled? Can the load system absorb a heavy current surge without flinching? Slip on any one of these and the test data won’t hold up — let alone survive product certification.
NH-016: Built for These Pressure Points
The NH-016 cable fire resistance test machine was designed with exactly these challenges in mind, delivering a complete solution for circuit integrity testing of fire survival cables.
Rugged, high-temperature combustion chamber
- 304 stainless steel chamber shell with fireproof board lining rated for 700 °C
- 750 °C heat-resistant observation window for safe, real-time visual monitoring
- Interior space of roughly 3 meters on each side — enough to hold a standard test rack and multiple cable specimen sizes, including large-diameter cables on cable trays
Precision combustion control for stable, repeatable flames
- Imported mass flow controllers precisely manage the air-to-propane ratio
- Two pressure-reducing valves hold gas pressure steady at 0.1 MPa
- Two 1.5 mm K-type thermocouples track fire source temperature in real time
- Fully automated burn process: gas and flame shut off automatically once the test ends; if the flame goes out unexpectedly, an alarm triggers automatically — protecting both the specimen and the operator
Heavy-duty load system for current-surge stability
- Three-phase transformer rated at 5 kW, powering five three-phase, five-wire circuits simultaneously
- Each circuit fitted with its own ammeter, indicator light, fuse and adjustable resistor
- Test voltage 0–1000 V adjustable; load current settable in the 0.1–3 A range per the standard — even approaching the 3 A ceiling, the specimen keeps testing without a hitch
- The same load capacity covers the demands of water-spray and impact testing
Two burner configurations for international standards
- One burner for standard fire resistance test runs
- A second burner built specifically to meet the fire-source requirements of BS 6387:2013 Protocol C, with nozzle length and hole layout following the standard precisely
Flexible specimen handling
- Test ladder height and spacing adjust to fit different cable sizes
- Seven freely repositionable metal rings make securing cable specimens noticeably easier
Who Needs the NH-016?
- Cable certification laboratories performing third-party fire resistance testing for product certification filings
- Quality control teams inside cable manufacturers verifying every production lot of fire-resistant cable
- Fire safety and life-safety system suppliers, rail transit, nuclear power and marine cable projects requiring traceable test evidence
For these users, the real value of equipment like this is converting “fire-resistant” from a marketing phrase into a set of hard numbers that hold up under review and can go straight into a certification file. When customers choose fire-resistant cable, what they trust isn’t the copy on the packaging — it’s the numbers on a third-party test report. And those numbers, at the root, come down to how precise and stable the testing equipment actually is.
FAQ
What is a cable fire resistance test? A cable fire resistance test verifies that a cable maintains electrical circuit continuity while exposed to an open flame at high temperature — typically no less than 830 °C — often combined with water spray and mechanical impact, per standards such as GB/T 19216.21 and BS 6387.
What standards does the NH-016 cable fire resistance test machine support? The NH-016 supports GB/T 19216.21, GB/T 19216.23 and GB/T 19216.25, and includes a dedicated burner configuration for BS 6387:2013 Protocol C fire-source requirements.
What is circuit integrity testing of cables? Circuit integrity (or circuit continuity) testing confirms that a fire-resistant cable keeps conducting current throughout and after a fire test — so fire alarms, sprinkler systems, emergency lighting and other life-safety circuits keep working when they are needed most.
Why are water spray and mechanical impact included in cable fire testing? Real fires rarely burn a cable in isolation. Firefighters spray water and falling debris strikes cable trays, so standards such as GB/T 19216 combine flame, water spray and mechanical impact to simulate realistic fire conditions.
Which industries require fire-resistant cable testing? Fire safety and life-safety systems, rail transit, nuclear power, marine and offshore applications, tunnels, and high-rise buildings — any environment where circuit survival during a fire is critical.
Get a Quote
Need a reliable cable fire resistance test machine for your certification lab or cable manufacturer QC department? Contact Shenyang Baoruitong Automation Equipment Co., Ltd. today for the NH-016 datasheet, test procedure guidance and a customized quotation. Every BRT instrument is backed by a 1-year warranty, installation guidance, operation training and long-term after-sales support.
Email: info@brt-test.com | WhatsApp: +86 15604057553 | Web: www.brt-test.com