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#1
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Installing a separate watthour meter and confused by bonding neutral and ground
I am installing a separate watthour meter in my home to monitor the
power usage of a high load appliance in my garage. The meter is 2 phase 3 wire and is designed w/ the neutral (center pole) bonded to the housing; there is no way around this, nor have I seen any meters that make this an option. I plan to run THHN 4446 wire from my main panel through metal conduit to the meter housing; the conduit and the meter housing would both be ground. Thus, when I tie down the neutral to the meter I would have no choice but to bond it to ground (as the housing is designed). From my understanding, neutral and ground are only supposed to be bonded together in one location: the main service entrance breaker box. If I am bonding neutral to ground at this second location (my meter housing), isn't that bad? What am I supposed to do w/ the ground in a meter housing? Am I not supposed to bring ground in to the meter housing? Is it OK to bond ground and neutral in a meter housing? If not, do I not connect the conduit/housing to the main service ground, and then just run a separate ground for my garage conduit/housing? Thanks! Pv |
#2
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Installing a separate watthour meter and confused by bonding neutral and ground
I have seen a meter for just this -- you plug in the appliance and it
gives you the wattage drawn (I assume it is calculating real power, not VA's) |
#3
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Installing a separate watthour meter and confused by bonding neutral and ground
It's single phase three wire, not two phase. Typical watt hour meters used
by utility companies bond their neutral to the fifth jaw of the meter, which is grounded by the utility companies neutral and you don't run a separate ground to the meter box. If you are trying to sub meter, you may be better off using something like an "emon demon" designed for that purpose wrote in message ups.com... I am installing a separate watthour meter in my home to monitor the power usage of a high load appliance in my garage. The meter is 2 phase 3 wire and is designed w/ the neutral (center pole) bonded to the housing; there is no way around this, nor have I seen any meters that make this an option. I plan to run THHN 4446 wire from my main panel through metal conduit to the meter housing; the conduit and the meter housing would both be ground. Thus, when I tie down the neutral to the meter I would have no choice but to bond it to ground (as the housing is designed). From my understanding, neutral and ground are only supposed to be bonded together in one location: the main service entrance breaker box. If I am bonding neutral to ground at this second location (my meter housing), isn't that bad? What am I supposed to do w/ the ground in a meter housing? Am I not supposed to bring ground in to the meter housing? Is it OK to bond ground and neutral in a meter housing? If not, do I not connect the conduit/housing to the main service ground, and then just run a separate ground for my garage conduit/housing? Thanks! Pv |
#4
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Installing a separate watthour meter and confused by bonding neutral and ground
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#5
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Installing a separate watthour meter and confused by bonding neutral and ground
From my understanding, neutral and ground are only supposed to be bonded together in one location: the main service entrance breaker box. If I am bonding neutral to ground at this second location (my meter housing), isn't that bad? Yes bonding the neutral and ground at a second location is bad and it violates NEC. If you do bond them here you will split the neutral current across the neutral conductor and the ground conductor. The ground conductor should not have current on it during normal operation. You must find a way to isolate them. What exactly are you trying to meter? |
#6
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Installing a separate watthour meter and confused by bonding neutral and ground
Eric9822 wrote: From my understanding, neutral and ground are only supposed to be bonded together in one location: the main service entrance breaker box. If I am bonding neutral to ground at this second location (my meter housing), isn't that bad? Yes bonding the neutral and ground at a second location is bad and it violates NEC. If you do bond them here you will split the neutral current across the neutral conductor and the ground conductor. The ground conductor should not have current on it during normal operation. You must find a way to isolate them. What exactly are you trying to meter? An electric vehicle charger. A MagneCharger to be precise. It will draw ~33amps @ 240V. |
#7
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Installing a separate watthour meter and confused by bonding neutral and ground
RBM (remove this) wrote: It's single phase three wire, not two phase. Typical watt hour meters used by utility companies bond their neutral to the fifth jaw of the meter, which is grounded by the utility companies neutral and you don't run a separate ground to the meter box. If you are trying to sub meter, you may be better off using something like an "emon demon" designed for that purpose Sorry, I meant 2 pole (single phase), not 2 phase. At first I considered getting an emon, but it seemed that a watthour meter and housing was more professional looking. I am using an Itron Centron meter. Do I need a "neutral isolation kit" in order to properly set up a submeter? Thanks! Pv |
#8
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Installing a separate watthour meter and confused by bonding neutral and ground
I'm not familiar with that meter, that's why I suggested an Emon, to avoid
the problem wrote in message oups.com... RBM (remove this) wrote: It's single phase three wire, not two phase. Typical watt hour meters used by utility companies bond their neutral to the fifth jaw of the meter, which is grounded by the utility companies neutral and you don't run a separate ground to the meter box. If you are trying to sub meter, you may be better off using something like an "emon demon" designed for that purpose Sorry, I meant 2 pole (single phase), not 2 phase. At first I considered getting an emon, but it seemed that a watthour meter and housing was more professional looking. I am using an Itron Centron meter. Do I need a "neutral isolation kit" in order to properly set up a submeter? Thanks! Pv |
#9
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Installing a separate watthour meter and confused by bonding neutral and ground
wrote in message ups.com... Eric9822 wrote: From my understanding, neutral and ground are only supposed to be bonded together in one location: the main service entrance breaker box. If I am bonding neutral to ground at this second location (my meter housing), isn't that bad? Yes bonding the neutral and ground at a second location is bad and it violates NEC. If you do bond them here you will split the neutral current across the neutral conductor and the ground conductor. The ground conductor should not have current on it during normal operation. You must find a way to isolate them. What exactly are you trying to meter? An electric vehicle charger. A MagneCharger to be precise. It will draw ~33amps @ 240V. I am not sure but I seem to recall that at least some 240V meters do not use a neutral connection. If not, you could just run the neutral thru the socket and tie the grounds to the meter base. Don Young |
#10
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Installing a separate watthour meter and confused by bonding neutral and ground
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#11
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Installing a separate watthour meter and confused by bonding neutral and ground
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