On a pole mounted service with a 200amp breaker panel installed under the metercan ,I have seen several where a #6 bare grounding electrode conductor was stuck out of the meter can and split bolted to the poles #6 ground wire that the power co. installs on thier poles,,,,,is this an acceptable grounding electrode or should a ground rod be driven to supplement and bond to the power co. ground wire.Although this is a sufficient ground for the power co. high voltage I do not think this is an acceptable grounding electrode conductor for a service.Also,I always ground the neutral in the meter can and then extend an insulated ground wire down into the panel on its own bar,remove the jumper between the neutral bar and ground bar and install the bonding screw from the ground bar into the panel to bond the panel to ground and leave the neutral insulated from the ground in the panel,,,can the jumper between the ground bar and the neutral bar be left in place,seeing as how this is the main service entrance panel even though it is bonded in the meter can?
new service
- Thread starter jap2525
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
Re: new service
Don
That would be a violation of 250.64(C).
That would be a violation of 250.24(B) which requires that the grounded conductor be bonded to the service disconnect enclosure in at each service disconnect. The grounded conductor is permitted to be used for all required grounding and bonding on the line side and within the service disconnect enclosure. You should leave the bond in the service disconnect and eliminate the grounding jumper between the meter and the service disconnect.
Don
Re: new service
the neutral bar in the meter is bolted directly to the metal enclosure it is not insulated, so in a sense the neutral is bonded to the service disconnect enclosure through the ground wire brought from the meter to the service disconnects ground bar which is bonded through the screw to the enclosure,a fault on a branch circuit to ground would return to the ground bar up into the meter can on the insulated ground wire and to the neutral through the can for a fault path,a fault in the service disconnect would travel through the bonding screw to the ground bar or through the metal enclosure back to the neutral in the metercan,the neutral is bonded to the service disconnect through the ground wire brought from the groundlug in the meter to the groundbar in the panel.
the neutral bar in the meter is bolted directly to the metal enclosure it is not insulated, so in a sense the neutral is bonded to the service disconnect enclosure through the ground wire brought from the meter to the service disconnects ground bar which is bonded through the screw to the enclosure,a fault on a branch circuit to ground would return to the ground bar up into the meter can on the insulated ground wire and to the neutral through the can for a fault path,a fault in the service disconnect would travel through the bonding screw to the ground bar or through the metal enclosure back to the neutral in the metercan,the neutral is bonded to the service disconnect through the ground wire brought from the groundlug in the meter to the groundbar in the panel.
charlie
Senior Member
- Location
- Indianapolis
Re: new service
Don, if the AHJ would permit it and with a bit of a stretch, 250.64(D) could be applied to the first part of the question. The reason for framing the answer that way is that the pole ground is not from service equipment. However, it seems appropriate to me to permit this type of installation where a connection is made from a service to a pole down ground.
Don, if the AHJ would permit it and with a bit of a stretch, 250.64(D) could be applied to the first part of the question. The reason for framing the answer that way is that the pole ground is not from service equipment. However, it seems appropriate to me to permit this type of installation where a connection is made from a service to a pole down ground.
Re: new service
Dons making me want to call the power company back and cut the seal so I can pull the grounding jumper out from the meter to the panel.It passed inspection but if it is not right I feel I need to fix it,it may have been an oversight on his part.I guess the best way to do it is to leave the jumper bar in between the neutral and ground bar in the service panel,bond the neutral with the bonding screw to the can,land the grounding electrode conductor on the neutral or ground bar in the service panel,and land all the neutrals and grounds to either of the bars in the service panel,correct?
Dons making me want to call the power company back and cut the seal so I can pull the grounding jumper out from the meter to the panel.It passed inspection but if it is not right I feel I need to fix it,it may have been an oversight on his part.I guess the best way to do it is to leave the jumper bar in between the neutral and ground bar in the service panel,bond the neutral with the bonding screw to the can,land the grounding electrode conductor on the neutral or ground bar in the service panel,and land all the neutrals and grounds to either of the bars in the service panel,correct?
A
a.wayne3@verizon.net
Guest
Re: new service
From the meter to the primary panel there is no insulated ground used.All needed is 2 hots and a neutral the meter and ground are one at the meter and the primary panel.Now if the meter feeds a main breaker panel and then feeds a distribution panel yes at that point a seperate ground is needed and the neutral is not bonded to the panel at that point but the grounds are and have to be seperated from the neutrals IE: remove the bonding jumper depending on the manufacturer or add a ground bar.
From the meter to the primary panel there is no insulated ground used.All needed is 2 hots and a neutral the meter and ground are one at the meter and the primary panel.Now if the meter feeds a main breaker panel and then feeds a distribution panel yes at that point a seperate ground is needed and the neutral is not bonded to the panel at that point but the grounds are and have to be seperated from the neutrals IE: remove the bonding jumper depending on the manufacturer or add a ground bar.
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