Factory Price For XJM7 Measuring Box (Low Voltage Power Measurement Box) Wholesale to Seattle
Exterior and dimensions
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XJM7 series of lighting Power metering box is suitable in power centralized measurement management of apartment buildings office buildings. Pulse-type power meter can be installed to according to the design needs to achieve computer management. Besides, proper location is preserved to install remote-measuring remote sensing equipment. There are small circuit breakers installed in the cabinet to protect the line from overload, short circuit. The power meter and circuit breaker rated current are selected by design.
In line with GB7251.1-1997 and 7251.3-1997 standards.
IEC 60909 Standard for calculating Short Circuit Currents in 3 Phase AC Systems
Practical Examples and Tutorial
Test set up with an overhead line to a 20 Amp MCB protected piece of 1.5 mm² TPS cable.
Later the MCB was bypassed to see what happened.
The 1.5mm² TPS overheated rapidly and burnt out.
A bolted short was made on the OH line.
The overhead line 2.5mm² overheated rapidly and the pvc insulation melted as well as the line sagged.
At the end of the video an other piece of 1.5mm² TPS cable was used again.
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