In an explosive atmosphere, such as gas stations, oil, fuel tank and other equipment must be explosion-proof products. According JJF2-2003 "type anti-static grounding device detection norms", the main station to be tested following the grounding resistance and connection resistance facilities. Instrument testing must meet GB3836-2000 "explosive gas environment with electrical equipment" requirements.
Ex pump
Grounding system at the gas station, oil tank and auto fuel dispenser A ground electrode is connected to a ground electrode loading point C is a separate grounding. Find a separate ground electrode as an auxiliary ground electrode B (such as water pipe, etc.), according to the three-point method were measured with the Meter R1, R2 and R3.
Then find a fuel dispenser grounding mutually independent grounding, such as loading and unloading point grounding so on. With a test line connecting the two points, measured by the Meter readings RT. Where: RT is measured clamp resistance. RC for the loading and unloading point grounding resistors. The fuel dispenser grounding resistance: R = RT-RC
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