[RE-wrenches] Redundant Bonding

[August Goers]

Hi Karl -



I'll send you a picture off list showing how we typically wire up
7-terminal meter sockets. In the Milbank meter sockets we typically use the
neutral bar is factory bonded to the can. So, we pass the neutral through
the can and then connect a ground in the can. This provides the power
necessary to run the meter without bonding the neutral to ground in two
locations.



I'm not sure that I'm following your issue relating to the inverter and NEC
250.142(B). The Power One 10k unit has HF isolation and still needs a DC
GEC as far as I know.



Best,



August

415.559.1525



*From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Karl Jaeger
*Sent:* Wednesday, February 20, 2013 8:13 AM
*To:* RE-wrenches at lists.re-wrenches.org
*Subject:* [RE-wrenches] Redundant Bonding



Greetings Wrenches,

I am having issues with the electrical plans reviewer approving our drawing
package. The system consists of a  PVI 10.0, 3-phase inverter to be
interconnected via backfed breaker to a 120/208 service. We have a feed in
tariff program which requires a solar generation meter base. The solar
meter base is provided by the utility, it is 7-terminal therefore it has a
neutral connection and a bond between neutral and ground. The service is
also bonded, of course. We have two bonds resulting in a ground loop. The
utility refuses to allow us to remove the bonding jumper in the solar meter
base and we can’t float the neutral thru because the meter must see a
neutral  to spin. The inverter has an isolated transformer which I believe
steers us around 250.142 (B). However, Power One does not specify a GEC
termination point in their inverter so the reviewer is reluctant to accept
this solution. Has anyone ran into this issue? Any thoughts?

Thank you for your help!



*Karl Jaeger*

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(Small)]<http://lightwavesolarelectric.com/>












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