Minerals Fire-resisting Busway Superiority

Abstract: 200A or more minerals fire busbar for fire-fighting equipment supply mains and branch lines. It has a more complete standards and testing methods ensure that the fire in the fire when the distribution system running more secure. With mineral insulated cables and flexible mineral insulated cable, compared with significant performance and price advantage. The product uses a flat conductor material with good heat dissipation, low impedance and load flow characteristics. Fire distribution lines use it not only safe, reliable and efficient energy saving, reducing the project cost, but also for the country save a lot of valuable copper.

Keywords: Busway refractory minerals, mineral insulated cables, flexible mineral insulated cable, safe, reliable, cost-effective, efficient and energy-saving, saving copper.

As technology and rapid economic development, China's growing number of modern buildings, leading to the risk of fire is also increased. In recent years, causing an electrical fire on the building of our country more and more attention. In a related specification clearly defines the fire distribution lines, under fire conditions required to maintain continuity of supply, ensuring personnel evacuation and fire fighting time, the current products are better fire resistance mineral insulated cables and minerals fire busbar. Now product-related standards and the type of pilot projects are described below:

First, mineral insulated cable type testing standards and methods:

As early as 1991 mineral insulated cables of the relevant national standards GB/T13033.1-1991 in 2007 revision GB/T13033.1-2007; GB/T13033.1-2007 fire resistance test: cable or wire cable, under fire conditions - Test methods for maintaining the integrity of the line. GB/T19216.21-2003; The two standard equivalent to the IEC standard conversion in GB.

Mineral insulated tubular type test according to GB/T13033.1-2007 project
Pilot project Standard clauses No. Testing purposes
Conductor resistance 5 Conductor material resistivity
Insulation Resistance 11.3 Insulation resistance performance
Insulation thickness 13.4 Thickness is uniform production
Copper protective shell resistance 13.3 Copper shell protection resistor (Material)
Copper protective shell thickness 13.5 Uniform thickness
Test voltage 13.2 Withstand voltage performance
Bending test 13.5 Not affect the performance of the bending
Flattening test 13.7 Whether damaged by weight
Fire test 13.8
Press GB/T19216.21 for fire 750 ℃ ​​-800 ℃, refractory time 3 hours
Whether to keep under fire conditions - Circuit integrity -
A, flexible mineral insulated cables criteria and test

Flexible mineral insulated copper cable performance and style are different, at present, has a national standard, mineral insulated cable test, in accordance with British BS6387 standard test.

BS6387 commissioned pilot project
Pilot project Standard clauses No. Testing purposes
Conductor resistance test 7.1 Detection conductor resistivity (Material)
Routine tests 7.2.1 A1, A2 Detect insulation (withstanding voltage)
Length test 7.2.2 A1, A3 Water insulation
Bending characteristic test 8 B1, B3 Detect curvature
Ambient temperature bending test 8 B2, B3 Water environment in the fire bending
Impact resistance test 9.1, Appendix C Anti-shock performance object
Jacket cold impact test 9.2 Impact at ambient temperature would not affect the degree of damage to the sheath insulation
Tests under fire conditions:
A, 650 ℃ ± 40 ℃ 3 hours
B, 750 ℃ ​​± 40 ℃ 3 hours
C, 950 ℃ ± 40 ℃ 3 hours
D, 950 ℃ ± 40 ℃ 20 minutes
11.1 D1, D2 Fire resistance:
Fire detection cable temperature and time
Resistance to mechanical shock and fire test BS6207 Under fire performance in mechanical shock

BS6387 pilot project perspective: the test items than GB/T13033.1 particularly reflected in the fire the fire and fire performance; But within two standard feature on the current carrying capacity of the testing.

Second, fire busbar standards and tests:

Minerals fire busbar: Low-voltage switchgear is a unified standard GB7251 Particular requirements for busbar is GB7251.2 equivalent IEC60439.2 fire resistance test according to the international standard IEC60331; fire resistance test by our GA/T537 -2005 4.3 requirements.

Minerals fire busbar type test project
Pilot project Standard No. GB7251.2 Testing purposes
Temperature rise limit verification 8.2.1 Current carrying capacity verification
Busbar system electrical performance validation 8.2.9 A, Conductor resistance
B, Conductor reactance
C, Total impedance
D, Conductor size
Dielectric performance verification 8.2.2 Insulation
Protection circuit validation 8.2.4 Fault current evacuation capability
Protection Level Authentication 8.2.7 Room temperature, dust, water capacity
Structural strength verification 8.2.10 Withstand mechanical stress
Short circuit withstand strength verification 8.2.3 Short circuit mechanical strength
Mechanical operation verification 8.2.6 Plug the operational performance of the switch box
Pressure resistance performance verification 8.2.12 Pressure
Abnormal heat resistant insulating material verification 8.2.13 Heat resistance of insulating materials
Fire performance verification GA/T537-2005 4.3.1 Fire Resistance: Fire 60 minutes
Compared with GB/T19216.21-2003 or BS6387,
For fire 950 ℃, more than three hours
Fire water test GA/T537-2005 4.3.2 On fire 30 minutes after the fire sprinkler test water resistance test

Products in the above three different test methods, reflected in: Mineral fire busbar pilot project more complete; include: carrying capacity, at room temperature under conditions of fire or flame and water resistance, mechanical strength, short-circuit strength and so on. In particular the limit temperature of the test The test proved the test bus carrying capacity, can withstand full load operation.

Refractory minerals and mineral insulated cables busbar cost
Refractory minerals bus Rigid mineral insulated cable Flexible mineral insulated cable
Standard fire test GB7251.2-2006
GA/T537-2005
GB/T192161.21-2003
GB/T13033.1-2007
GB/T19216.21-2003
BS6387
Certification Compulsory 3C certification type test Type test Commissioned test
Specifications 200A-6300A 4mm ²-400mm ²
25A-700A
2.5mm ² -630 mm ²
16A-1000A
Laying Laying out from the surrounding thermal effects Be laying out and laying tank Laying vessel carrying capacity due to thermal issues, changes in the larger carriers
Price 1000A busbar more refractory minerals mineral insulated cable lower than the 30% -50%
500A-1000A busbar refractory minerals mineral insulated cable lower than 15% -30%
200A-500A busbar refractory minerals mineral insulated cable lower than 5% -15%
200A the following is not a mineral fire busbar
Saving copper resources 1000A busbar more minerals than mineral insulated cable refractory copper resources saving 60% -90%
500A-1000A busbar refractory minerals mineral insulated cable than copper resources saving 30% -60%
200A-500A busbar refractory minerals mineral insulated cable than copper resources saving 10% -30%
Save energy 1000A above the no-load line loss savings of 30% to 50%, with a load line loss savings of 20% ~ 30%
500A ~ 1000A unloaded line loss savings of 15% to 30%, with a load line loss savings of 10% ~ 20%
200A ~ 500A No-load line loss savings of 8% to 15%, with a load line loss save 5% ~ 10%
Green Busway production and recycling of refractory minerals than mineral insulated cables environmentally
construction Busway at the scene of the actual project needs to be customized for each section of the site needs to be formed by bend, easy construction
Carriers and environmental impact Refractory minerals busbar current carrying capacity limit has been done temperature rise test, without additional housing, the carrier runs;
If the current is laying in the tank due to changes in ambient temperature carrying capacity declined severely, no test data to design selection and configuration of the upper switching currents cause difficulty setting
Mineral insulated cables with a large number of current-carrying capacity, no basis;
Is uncertain current data, design to withstand greater risk of carrying capacity and the introduction of the configuration of the upper switch rated current technical problems

200A or more minerals fire busbar supply mains for fire-fighting equipment and branch lines. It has a more complete standards and testing methods ensure that the fire in the fire when the distribution system running more secure. With mineral insulated cables and flexible mineral insulated cable, compared with significant performance and price advantage. The product uses the flat conductor material with good heat dissipation, low impedance and load flow characteristics. Fire distribution lines use it not only safe, reliable, efficient and energy saving, reducing the project cost, but also for the country save a lot of valuable copper.