The code below gets readings from 2 sensors on AC 'live' wires. In the UK, our AC supply is 50 Hertz so to get the peak amps at any given time, the wave form needs to be sampled over 20 micro seconds. NB. The sensors have not been calibrated.

int i=0;
int sensorValueOne;
int sensorValueTwo;
float maxValueOne;
float maxValueTwo;
float runningMaxValueOne = 0;
float runningMaxValueTwo = 0;
unsigned long currentMillis = 0;
unsigned long previousMillisOne = 0;
unsigned long previousMillisTwo = 0;
int intervalOne = 0;
const int intervalTwo = 1000;
int millisCalcOne =0;
int millisCalcTwo =0;
int ACFrequency = 50; // Hertz

void setup() 
{
  Serial.begin(115200);
  intervalOne = 1000 / ACFrequency; // Capture data over one complete AC cycle.
}

void loop() 
{
  currentMillis = millis();
  millisCalcOne = currentMillis - previousMillisOne;
  millisCalcTwo = currentMillis - previousMillisTwo;  
  i++;
  //Serial.print("  i:  ");Serial.println(i);
  sensorValueOne = analogRead(A0);
  sensorValueTwo = analogRead(A1);
  if(sensorValueOne > maxValueOne)
  {
    maxValueOne = sensorValueOne;
  }
  if(sensorValueTwo > maxValueTwo)
  {
    maxValueTwo = sensorValueTwo;
  }
//////////////////////////////////////////////////////////////////////////////
  if (millisCalcOne > intervalOne)
  {
    runningMaxValueOne = (maxValueOne - 523)/80;
    runningMaxValueTwo = (maxValueTwo - 523)/80;
    //Serial.print("  LHS amps max:  ");Serial.print(runningMaxValueOne,2);Serial.print("  RHS amps max:  ");Serial.println(runningMaxValueTwo,2);
    maxValueOne = 0;
    maxValueTwo = 0;
    i=0;
    previousMillisOne = currentMillis;
  }
  if (millisCalcTwo > intervalTwo)
  {
    //Serial.print("sensorValueOne:  ");Serial.print(sensorValueOne); 
    Serial.print("  LHS amps max:  ");Serial.print(runningMaxValueOne,2);Serial.print("  RHS amps max:  ");Serial.println(runningMaxValueTwo,2);
    previousMillisTwo = currentMillis;
  }
}