Shock, Vibration, Rain, Combustion Testing Machine, Fire Resistance, Water Spray

Product Specification

Introduction:

The performance requirements of this testing machine include fire resistance test, water spray fire resistance test, and mechanical fire resistance test. It is suitable for mineral insulated cables with a rated voltage not exceeding 450/750V, and can maintain circuit integrity for a long time under flame conditions.

Compliant with standards:

Complies with the test standard requirements of the British Fire resistant Cable Standard BS6387 "Specification for Performance Requirements of Cables to Maintain Circuit Integrity in Fire Conditions".

Equipment composition:

Fire resistance test: The fire resistance test bench includes the following parts: cable support system, continuous detection device, heat source, etc;

1. Cable support system: The cable is horizontally clamped at both ends of the cable sheath through clamps. The middle part of the cable is fixed by two metal rings (spaced 300mm apart), which are grounded to the other metal parts of the device. The cable support device is shown in Figure 1. For unarmored cables with a diameter less than 10mm, or other cables that experience significant displacement during testing, three metal rings are used, each fixed approximately 150mm away from the original metal ring.

2. Continuous detection device: During the test, the current is allowed to pass through all cores of the cable, one three-phase star connected transformer or three single-phase transformers (or one single-phase transformer, if the test is a single core cable), and has sufficient capacity to maintain the maximum allowable leakage current of 3A at the test voltage. Connect a lamp to each core wire at the other end of the cable and load a current close to 0.25A at the rated voltage of the cable.

3. Heat source:

• Heat is a 610 millimeter long tubular gas burner that can forcibly supply methane and has a dense flame.
• Temperature measurement: A 2mm diameter armored thermometer is placed near the air inlet, parallel to 75mm above the burner

3. Test flame temperature and time: (see BS6387 combustion level)

A 650. C ± 40 ° C -3 hours

B 750. C ± 40 ° C -3 hours

C 950. C ± 40 ° C -3 hours

S 950. C ± 40 ° C -20 minutes

4. Sample: The sample is a section of the finished product, not less than 1200mm, with 100mm of sheath and cover removed from each end. The wires at both ends of the cable should be connected electrically.

5. Test voltage: 200-1000V, adjustable as shown in Figure 7

*BS6387 flame retardant grade requires passing horizontal combustion experiments, water spray experiments, and mechanical shock vibration combustion experiments.

Horizontal combustion test: A grade 650 ℃/3h, B grade 750 ℃/3h, C grade 950 ℃/3h, and S grade 950 ℃/3min. A level indicates no breakdown after burning at a voltage level of 300 volts for 3 hours at 650 ℃; B-level indicates no breakdown after burning at a voltage level of 300 volts for 3 hours at 750 ℃; C-level indicates no breakdown after burning at a voltage level of 300 volts for 3 hours at 950 ℃; S-level indicates no breakdown after burning at a voltage level of 300 volts for 3 minutes at 950 ℃.

Water spray combustion test: divided into W levels, indicating that no breakdown occurs after applying a 300 volt voltage to burn for 15 minutes and then spraying water to burn for 15 minutes.

Impact vibration combustion test: divided into X level 650 ℃/15min, Y level 750 ℃/15min, and Z level 950 ℃/15min. X level represents the mechanical impact vibration without breakdown for 15 minutes every 30 seconds when applying a voltage of 300 volts while burning at 650 ℃; Y-level indicates applying a voltage of 300 volts at 750 ℃ while burning, and mechanical shock vibration every 30 seconds for 15 minutes without breakdown; Z-level refers to a mechanical shock vibration every 30 seconds for 15 minutes without breakdown when applying a voltage of 300 volts at 950 ℃ while burning. The highest level model required by BS6387 is CWZ.