Meter Enclosure Discrepancy

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DanVal

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Location
Boston
Occupation
Electrician
Hi,

I recently completed a service for a residential 3 unit apartment. When I planned this service i had to address the local utility(National Grid). The Meters where located in the basement and there was also no public meter. National Grid wanted a disconnect on the outside of the house for each meter and lever bypass for the public meter. I told them due to supply shortages that I could install a 3 gang meter with tenant disconnects and would have a regular lever bypass no disconnect nippled off of it. They said that would satisfy their needs. I called the local AHJ and told them my plans as well, they told me disconnects are only required for one and two family dwelling but had no objections.

When I called for inspection the inspector picked out two things. Number one..............He is calling my disconnects in the meter enclosure service disconnects and not emergency disconnects. Since the dwelling is a 3 family and not a 1 or 2 he says they are simply service disconnects. The code needs to address this better and define what is and isn't an emergency disconnect. The code says meter sockets are not service equipment so why would the entire enclosure be? I think a disconnect that is part of the meter enclosure should be considered an emergency disconnect. 230.82 states that a meter disconnect shall be legibly field marked on its exterior in a manner suitable for the environment as follows: METER DISCONNECT NOT SERVICE EQUIPMENT. So we have equipment being referred to as service , meter , and emergency disconnects. Can somebody help me out here? The problem he has is that since he believes they are service disconnects that they are not grouped because the public doesn't have one and therefore would be located in the basement.

Number two of my nightmare. The Meter enclosure I have is a Siemens WP3311RJ. I has 3 Sections with barriers from top to bottom . The first left section has the 3 tenant breakers that feed your'e loads. The middle section has the three meters stacked vertically with individual covers. The right section has your lugs which you land your service drop. On the far left section where the tenant breakers are there is about an inch of bus bar exposed above each breaker. The bus is built to accept 225 amp breakers which would cover the entire bus. It is also meant to be interchangeable with QP breakers for smaller loads, in my case 100 amps. With the smaller QP breaker in and the exposed inch of bus he is bringing up article 230.62. Enclose, Guarded and Barriers. The only one that applies to me is Barriers. There is no protection to stop accidental contact to those exposed bus bars. Which also is related to my issue from before, is the meter service equipment? This only applies to service equipment. I cant find a multi-gang meter online that has barriers in between each tenant load or no possible contact with live parts. I suggested I cover the inch of bus with 3M Mastic pad so that there would be no more hazard. He wants individual barriers in between each tenant breaker made by the manufacturer which they do not produce.


Any help here would be appreciated. Why are we treating electrical equipment like there's gonna be a refrigerator repair man servicing it? If your'e not an electrician you shouldn't be taking off the 1/4 thick metal cover that's held in with 8 screws exposing the extremely dangerous inch of live bus. Why is the code so bland on how they define things? Why did the inspector make me take off all 3 covers of the meter enclosure while it was 10 degrees out and snowing then proceeded to have me take off all four panel covers to tell me you do neat professional work but lets have code dual? Why did I choose to take this job?

Rants over please help!
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
230.85 only applies to one- and two-family dwellings. The inspector is correct that the breakers at meters are service disconnects.
The meter disconnects, in 230.82, only exist where they are on the line side of the meter and your disconnects are on the load side of the meter.
In addition it is very unlikely that the meter enclosure complies with the rules in 230.71(B). As far as I know there are no meter/main assemblies with more than two meters that comply with that rule.
 

kwired

Electron manager
Location
NE Nebraska
230.85 only applies to one- and two-family dwellings. The inspector is correct that the breakers at meters are service disconnects.
The meter disconnects, in 230.82, only exist where they are on the line side of the meter and your disconnects are on the load side of the meter.
In addition it is very unlikely that the meter enclosure complies with the rules in 230.71(B). As far as I know there are no meter/main assemblies with more than two meters that comply with that rule.
230.71(B)(4) - where disconnects are in separate compartments? Aren't they usually in separate compartments?
 

DanVal

Member
Location
Boston
Occupation
Electrician
230.85 only applies to one- and two-family dwellings. The inspector is correct that the breakers at meters are service disconnects.
The meter disconnects, in 230.82, only exist where they are on the line side of the meter and your disconnects are on the load side of the meter.
In addition it is very unlikely that the meter enclosure complies with the rules in 230.71(B). As far as I know there are no meter/main assemblies with more than two meters that comply with that rule.
I’m fine with putting a disconnect on the public to make all of them grouped. It doesn’t really make sense that they would only require this for single and two family dwellings. My main issue is the barrier situation.
 

DanVal

Member
Location
Boston
Occupation
Electrician
230.71(B)(4) - where disconnects are in separate compartments? Aren't they usually in separate compartments?
Not in a tenant meter enclosure. All disconnects are separated from the meters but they don’t have individual dividers between themselves.
 

don_resqcapt19

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Location
Illinois
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retired electrician
230.71(B)(4) - where disconnects are in separate compartments? Aren't they usually in separate compartments?
Other than one two meter panel, there is exposure to the line side of the other disconnects when you open the disconnect cover.
The 2023 first draft says that this type of equipment will require a line side disconnect, however, some utilities will not permit a disconnet on the line side of their cash registers, other than where they require it for cold sequence metering. Typically that is only require for self contained 480 volt meters.
 

kwired

Electron manager
Location
NE Nebraska
Other than one two meter panel, there is exposure to the line side of the other disconnects when you open the disconnect cover.
The 2023 first draft says that this type of equipment will require a line side disconnect, however, some utilities will not permit a disconnet on the line side of their cash registers, other than where they require it for cold sequence metering. Typically that is only require for self contained 480 volt meters.
Maybe not all will comply, pretty sure I have seen some that would. Been a while since I installed one but pretty sure Square D EZ meter centers have isolated compartments where the disconnects are located. Of course if you have more than six tenants you will have a main disconnect module but if six or less you can install a main lugs module and use the six disconnect rule. From recollection I don't recall being exposed to other live components if you only have a single disconnect compartment open. Also from recollection you are not exposed to any live parts if a breaker is installed and is in the off position
 

DanVal

Member
Location
Boston
Occupation
Electrician
Maybe not all will comply, pretty sure I have seen some that would. Been a while since I installed one but pretty sure Square D EZ meter centers have isolated compartments where the disconnects are located. Of course if you have more than six tenants you will have a main disconnect module but if six or less you can install a main lugs module and use the six disconnect rule. From recollection I don't recall being exposed to other live components if you only have a single disconnect compartment open. Also from recollection you are not exposed to any live parts if a breaker is installed and is in the off position
Here’s a pic of my enclosure. I have a case open with Siemens to see if they make a covering for the uninsulated bus. The sticker on the housing says made in 2021 so I don’t see why they would leave the bus open. 7EE0008A-6893-4044-8B0B-104B7D0606A9.jpeg
 

kwired

Electron manager
Location
NE Nebraska
Here’s a pic of my enclosure. I have a case open with Siemens to see if they make a covering for the uninsulated bus. The sticker on the housing says made in 2021 so I don’t see why they would leave the bus open. View attachment 2559396
What is just beyond right edge of photo and has both a grounded and grounding conductor run to it? Should still be service equipment and the green is not needed until you leave first disconnecting means.

See it is mounted plumb though.
 

kwired

Electron manager
Location
NE Nebraska
That is the public bypass meter. The load leaves from the backside of it.
Does it have a service disconnecting means within? If not don't you have violation of grouping of the service disconnecting means?

A meter bypass lever is not a service disconnecting means., is simply a way for POCO to swap meters without interrupting power, the lever is typically behind the cover and the cover locked/sealed and there is no general access to it by the user.

Going back to your OP, those breakers are the service disconnecting means. Where required they also can be the emergency disconnecting means, so I think your inspector is barking up the wrong tree from that perspective, and since this is a three family dwelling 230.85 doesn't apply.

I'd say he is correct that this particular unit would not comply with 230.62, if the manufacturer makes barriers for those exposed bus segments it possibly could comply, but then there is 230.71(B)(4) that would still require each disconnect to be in separate compartments. This gear would be compliant with older codes the 2020 changes made it non compliant and the manufacturer needs to change their design if they want to be able to sell these to places that have adopted 2020.
 

don_resqcapt19

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Location
Illinois
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retired electrician
Here’s a pic of my enclosure. I have a case open with Siemens to see if they make a covering for the uninsulated bus. The sticker on the housing says made in 2021 so I don’t see why they would leave the bus open. View attachment 2559396
The UL Listing standard did not change to keep up with the changes made in the 2020 NEC in 230.71(B) because they could not get a consensus of the Standards Technical Panel members as to what the requirements should be.
Even with a covering for any exposed bus, the breakers are not in separate compartments from each other, and do not comply with the requirements of 230.71(B) in the 2020 code.

It appears that the 2023 code, as result of the listing standard not being updated for compliance with the 2020 NEC, will require a line side disconnect for all multi meter assemblies that include disconnects on the load side of the meter.
 

kwired

Electron manager
Location
NE Nebraska
The UL Listing standard did not change to keep up with the changes made in the 2020 NEC in 230.71(B) because they could not get a consensus of the Standards Technical Panel members as to what the requirements should be.
Even with a covering for any exposed bus, the breakers are not in separate compartments from each other, and do not comply with the requirements of 230.71(B) in the 2020 code.

It appears that the 2023 code, as result of the listing standard not being updated for compliance with the 2020 NEC, will require a line side disconnect for all multi meter assemblies that include disconnects on the load side of the meter.
I suppose if you had an existing 6 meter unit but was not initially using all six but wanted to add one more occupant you are SOL?
 

don_resqcapt19

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Staff member
Location
Illinois
Occupation
retired electrician
I suppose if you had an existing 6 meter unit but was not initially using all six but wanted to add one more occupant you are SOL?
There is no provision in the 2020 code to permit that but the following appears 230.71(B) in the first draft of the 2023.
Exception to (2), (3), (4), (5), and (6): Existing service equipment, installed in compliance with previous editions of this Code that permitted multiple service disconnecting means in a single enclosure, section, or compartment, shall be permitted to contain a maximum of six service disconnecting means.
 

kwired

Electron manager
Location
NE Nebraska
There is no provision in the 2020 code to permit that but the following appears 230.71(B) in the first draft of the 2023.
Does that just mean existing can remain in place? Can you add a circuit to one that wasn't fully utilized? Think it might need more clarification or you will get some AHJ's allowing the added circuit and others won't allow it.
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Here’s a pic of my enclosure. I have a case open with Siemens to see if they make a covering for the uninsulated bus. The sticker on the housing says made in 2021 so I don’t see why they would leave the bus open.
What exposed bus? I only see the line terminals. That compartment is usually sealed by the POCO, isn't it?
 

kwired

Electron manager
Location
NE Nebraska
Aha, didn't notice them. Yeah, unlike in panels, there's no reason for those parts to be exposed.
another problem with this particular one is you still have exposed bus if there is no breaker installed, though if it were an unused meter position that particular bus set shouldn't be energized anyway.
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Does that just mean existing can remain in place? Can you add a circuit to one that wasn't fully utilized? Think it might need more clarification or you will get some AHJ's allowing the added circuit and others won't allow it.
The panel statement on the PI that added the exception says: "This exception provides the AHJ with the ability to permit the installation of up to six disconnects in a single enclosure in equipment installed in compliance with editions prior to the 2020 NEC."
That is also how I read the text of the Exception, but it could be clarified.
 
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