Fire resistant and fire-resistant bus duct NHMC-2200A

The fire-resistant busbar trunking consists of an outer shell coated with fire-resistant paint, busbars wrapped with fire-resistant mica tape, and brackets made of fire-resistant insulation materials. There are multiple grooves on the bracket, in which busbars are embedded and fixed. There is a bus duct connection box at one end of the bus duct, and a bus tap box inside the bus duct. Fire resistant busbar trunking has excellent insulation performance, which can be used continuously in normal environments or for more than one hour in fire environments. It can be used in high-rise buildings and important facilities to replace fire-resistant cables for power transmission and distribution.

Fire resistant and fire-resistant bus duct NHMC-2200A

The busbar trunking should locally interconnect the ends of the two busbar conductors that need to be connectedParallel alignment, docking type bus duct. Insert the copper connecting piece and insulation partition into the end of the busbar, and clamp one copper connecting piece on each side of the busbar for each phase of the neutral gear. Place an insulation partition between the copper connecting pieces. After confirming that there are no issues, insert the insulation bolt and pay attention to whether the connection holes of the copper connecting piece, busbar end, and insulation partition are aligned, whether the copper connecting piece and insulation partition are in place, and tighten the bolt. The plug-in box cannot be unplugged without disconnecting the switch. Generally, three plug-in boxes can be connected to a 2-meter straight bus duct. Due to the low current of the plug-in boxes, the plug-in boxes are directly connected to the bus duct through connectors with corresponding interlocking. For external output, cables are usually used to confirm that there are no issues. Then, connect the two bus ducts to the connector bus and check the conductor connection surface at one end of the bus duct and whether the connector is damaged or bumped. The bus duct conductor should be inserted into the connector and secured in place using a torque wrench.

The FH type fire-resistant insulated busbar trunking produced by our factory complies with the IEC439-2 standard, as well as the JB8511-1996 air insulated busbar trunking departmental standard and the GB/T9978-88 building component fire resistance test standard.
2. FH type fire-resistant insulated bus duct is used with a rated voltage of 660V or below and a frequency of 50Hz or 60Hz.
3. The FH type fire-resistant insulated bus duct has a test voltage of 1000V and an insulation resistance of over 10M Ω within 30 minutes of ignition. At 60 minutes of ignition, the insulation resistance is 0.5 Ω and the test voltage is above 1000V.
4. FH type fire-resistant insulated bus duct adopts double row bolt connection, with extremely stable performance, easy installation, and shell protection level meeting the requirements of IP40.
5. Heating curve diagram for fire resistance test: The shell is composed of a mixture of cold drawn thin steel profiles. The two side panels are our company's double-layer hollow structure. Effectively preventing high-temperature gases or open flames from directly entering the interior of the busbar through a sealed hollow structure. The surface of the busbar shell is galvanized and sprayed with fireproof coating (when exposed to fire, the coating can quickly expand at a geometric speed on the surface of the busbar to form a dense carbonized insulation layer. Seal all gaps in the busbar shell to prevent high temperatures from directly entering the interior of the busbar).

The joint adopts fire-resistant insulation components, which are reliable and convenient to connect.

Selection of busbar trunking and calculation of technical parameters

The selection of busbar trunking is usually considered comprehensively from the following aspects: fire protection requirements, insulation materials should be flame retardant and have good heat resistance, do not release toxic gases at high temperatures, and structurally prevent chimney effects. Dense insulated busbar trunking should be preferred. If air insulated type or 3200 busbar trunking is selected, fire-resistant partitions should be installed in each unit of the trunking shell; For particularly important places, fire-resistant troughs should be selected to ensure the maintenance of emergency power supply in case of fire.

As for the installation site, the first consideration is the protection level of the slot shell, followed by the influence of the building structure on the shape, installation bracket form, and span of the trunking. For indoor workplaces such as large capacity substations, IP30 rated bus ducts can be used to improve their heat dissipation effect; For ordinary indoor work, such as electrical shafts and distribution rooms on floors, to ensure safety, bus ducts with a rating not lower than IP40 should be selected; For indoor damp places or places with splash proof requirements, in order to ensure that they can still work normally in the event of splashing, bus ducts with a rating not lower than IP54 should be selected; For outdoor or special requirements such as anti spray, anti wave, and anti-corrosion places, resin insulated bus ducts can be used separately

Fire resistant and fire-resistant bus duct NHMC-2200A

parameter
1. Working voltage: AC380V ± 10% 50Hz; Power consumption: 5KW
2. Furnace pressure measurement range: 0-100Pa Measurement accuracy:
3. Air flow rate: 0-50m3/min Measurement accuracy: ≤± 0.5 m3/min
4. Combustion gas source: propane, liquefied gas
5. Gas tank capacity: 50kg × 4
6. Test temperature: Program heating for 60 minutes, room temperature -925 ℃, 120 minutes
7. Room temperature -1050 ℃ 180min Room temperature -1115 ℃ 240min
8. Room temperature -1150 ℃
9. Furnace temperature: ± 15 ℃
10. Internal temperature of the specimen: ± 10 ℃
11. Test piece backfire temperature: ± 4 ℃
12. Temperature sensor:
13. Furnace: 6 armored nickel chromium nickel silicon K-value thermocouples Accuracy level: Level II
14. Back fire: 6 armored nickel chromium nickel silicon K-value thermocouples Accuracy level: Level II
15. Timing range: 0-360min Timing accuracy: 16. Sample horizontal * large combustion length: 2.4m
Flame retardant testing machine for power cable busbar trunking, sample vertical * large combustion length: 1.6m
Equipment dimensions: length x width x height (3 x 2 x 2.5) m;
Equipment weight: approximately 4000 Kg, installed on site.

eco-friendly products

In the event of a fire, the fireproof busbar does not release any toxic gases and will not form secondary combustion, making it a new generation of environmentally friendly electrical products

1) All performance indicators of the busbar comply with the standards of IEC439-1~2, GB7251.1~2-1997, JISC8364, and GB9978.

2) The bus duct can withstand a 2500V power frequency withstand voltage without breakdown or flashover for 1 minute.

3) Due to the use of high-strength ceramics as phase separation materials, bus ducts can withstand strong electrical and thermal stresses.

The bus duct is a fully enclosed structure with a protection level of up to IP54.

The protection level of the shell reaches IP68, and it can be immersed in water for a long time, and can resist the fierce spray of fire on it;
Adopt overall vacuum casting to ensure that there are no gaps in the bus duct;
Using insulation materials, toxic gases will not be emitted even in flames, ensuring the safety of personnel;
Using special thermal conductive materials, it has good heat dissipation function in normal working environment.

This product has electrical performance equivalent to other types of bus ducts under normal conditions. Please refer to the technical parameters and current rating of FH fireproof bus ducts for ordering. The installation structure is the same as other bus ducts, please refer to the selection for reference