IEEE 2780-2019 pdf download

IEEE 2780-2019 pdf download.IEEE Standard for Insulation-Piercing Connectors.
For the IPC covering a certain conductor cross-sectional area range, the maximum size should he selected from both the main cable and the branch cable for tests.
5.3.3 Test equipment
The test equipment is a digital torque wrench with accuracy of’ not less than 4% and a division value of’ not
more than 0. 1 N•m.
5.3.4 Test procedure
The IPU shall be installed according to installation instructions supplied by the manufacturer.
It is recommended that on the application of’ torque. the initial f’astening process can he done by hand and the following fastening process shall he done with the tool at the speed of approximately 8 s a full rotation, or the speed specified by the manufacturer’s installation instructions.
The shear-torsion moment of shear bolts/nuts at break shall comply with 4.1 .1.
5.4 Coating thickness measurement
The ferrous metal of the IPC components shall be tested for coating thickness. The test equipment. procedure and requirements shall be in accordance with Clause 5 to Clause 7 of ISO 2178:2016.
5.5 Flame-retardant performance test
5.5.1 Test equipment
The test equipment includes a holder, a timing device, a flame nozzle, a fuel supply device, fuel, and a box, described as follows:
— the holder shall he able to grip the IPC shell tightly during test, and the distance between the IPC and the flame nozzle could he adjustable.
Timing device: the measuring accuracy of the timing device shall be ± 1 %. The timing device is used to record the duration of the flame beginning and lasting on the IPC.
— Flame nozzle: a horizontally placed fuel nozzle with an inner diameter of 10 mm.
— Fuel supply device: a device with a pressure-regulating valve, a gas-regulating valve, and a gas tank. This device shall help ensure that the flame nozzle can stably jet out a 50-mm-long blue flame.
— Fuel: industrial methane gas.
– – Box. a box large enough to avoid air draft influence.
5.5.2 Test procedure and requirements
The IPC shall he clamped to the holder. The flame nozzle shall he fixed 50 mm above the IPC bottom edge.
The IPC test area shall he 45 mm from the flame noz7le. Open the gas regulation valve and the flame shall
keep a total length of 50 mm and a blue segment length of at least 15 mm. The gas source shall be cut oil after
10 s. The continuous burning time shall be recorded and shall not exceed 5 s. The test arrangement is shown in Figure 1.
5.6.1 Laboratory environment
In the laboratory, the temperature shall keep at 10 °C to 35 °C.
5.6.2 Test pretreatment
The pre-test IPCs and their matching cables shall be placed in a laboratory for4 h to reach ambient temperature. If the difference between laboratory indoor and outdoor temperature is within 5 °C. the placing time can be reduced to 2 h.
5.6.3 Impact test
5.6.3.1 Impact test at ambient temperature
5.6.3.1.1 Test equipment and arrangement
Test equipment shall include a I 000-g steel hammer with an arc-shape bottom surface of approximately
20 mm to 40 mm in radius and an impact tester. The TPC is fixed on the rigid base of the impact tester. The central point of steel hammer and the IPC shall keep superposition. The drop distance of the steel hammer is 200 mm. The test arrangement is shown in Figure 2.
5.6.3.1.2 Test procedure and requirements
The steel hammer shall drop freely and impact the IPC on the top surface [Figure 1(a)] and the side surface [Figure 1(b)] each once. There shall he no visible cracks on the TPC shell after tests.
5.6.3.2 Lowdemperature impact test
The IPC shall he placed at a temperature of—40 °C ±2 °C br 2 h and then have an impact test within I mm after being taken out from the temperature chamber as per 5.6.3.1.
5.6.4 Operating cable tensile breaking force test
5.6.4.1 Test cables
Test cables shall be new and match the IPC specification. The length of each cable shall not be less than 100 times of its conductor diameter and should not be less than 2.5 m.