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# ADE7953 single phase connection for Dual live wire

Hello

In Taiwan for single phase. we can connect L,N with ADE7953/ADE7854 as below. But in America, there are two phase (L1, L2, N) on single phase application. How to connect L1/L2/N  to input VP/VN of ADE7953 for voltage and current measurement? Thank you.

BR

Patrick

Parents
• there are a couple ways to do this

1.  measure line to line voltage and current in each leg.    after calibration    power line 1 = voltage/2 * IA   power line 2 = voltage/2 * IB

2. measure line to line voltage and use one ct to measure both line 1 and line 2 currents. The link below explains this method

3. If you need all voltages and currents use a 3 phase part only connecting 2 phases.

Dave

• Dear Dave

Some questions as below. Could you help it?

1.  for CNS connection , is it correct for Fig 1?

2. For UL connection, N phase is replaced by L2. Has any problem for it?  If not use the same board for UL and CNS, how  to design for CNS & UL board?

3,  if connection is for differential, is it ok also for Fig 3? Thank you.

Fig 1

Fig 2

Fig 3

BR

Patrick

• Figure 1 and 2 are basically the same which are correct implementations just exchanging neutral for L2 . when usign figure 1 you have to assume Line and neutral may be swapped at installation the GND may be live even in figure 1. figure 2 gnd will be Live(L2 to earth)

3. What is the purpose of figure 3? Is this for protective impedance ? As far a voltage measurement it is similar to figure 1 and 2.

Dave

• Hello Dave

Per my understanding, if figure 1 and figure 2 maybe have Live to earth while Line and neutral swapped. The GND of ADE7953 is connected to neutral but nor connect to earth, right? Or have any standard connection compatible CNS & UL to suggest?

Other questions:

1. The current of neutral must be measured by CT? Or just only measure L phase current is enough.

2. If we not measure the current of  neutral . Could IBP、IBN be used for leakage current measurement?

3. If we would like IBP、IBN for  leakage current measurement,  have any sample code or scenario to implement this function? Thank you.

BR

Patrick

• Hello Dave

Could you help comment as above? Thank you.

BR

Patrick