12 Years Factory wholesale XJM7-W Measuring Box (Outdoor Energy Measuring Box) for Zurich Factories
Exterior and dimensions
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XJM7-K measuring cabinet (outdoor street lamp measurement control box) is suitable in power supply line with AC 50HZ, rated insulation voltage 660V, rated voltage 380/220v, as energy measurement equipment of residential quarters, villas energy measurement etc.
In line with GB7251.1-1997 and GB7251.3-1997 standards.
Household power supplies in North America use what’s called a split-phase system. The transformer on the pole outside the house takes grid power and steps it down to 240 VAC from end to end on the secondary winding. The secondary winding has a center-tap in it which splits this 240 VAC into two 120 VAC voltages from either end to the center tap. This center tap is defined as Neutral and it is tied to Ground in the circuit breaker box inside the home. The two 120 VAC voltages are 180 degrees out of phase with each other and it is this very antiphase relationship that creates the voltage difference of 240 vac between L1 and L2.
There’s a lot of disinformation and tech myths out there about 120/240 split-phase household power supplies. You may have even seen videos online claiming that the split phases are in-phase with each other. This is complete hogwash and I prove it to you in this video.
I show the proper phase relationship (180 degrees) between Line 1 to Neutral and Line 2 to Neutral right at the circuit breaker box using an oscilloscope.
I challenge anyone to show differently and to clearly show how you’re measuring.
Learn electricity, circuits, and troubleshooting from a proven master with verifiable credentials at the Master Samurai Tech Academy. http://mastersamuraitech.com