Conductors In The Electrical Panelboard

[globe trekker]

I have a question, ..or two for ya'll!

According to Article 408.41 in the 2008 NEC & E3606.4 in the 2006 IRC: "Each grounded conductor

shall terminate within the panelboard in an individual terminal that is not also used for another

conductor. Exception: Grounded conductors of circuits with parallel conductors shall be permitted to

terminate to a single terminal if the terminal is identified for connection of more than one conductor."

This is a Residential application.

QUESTION #1: Can more than one grounded conductor, installed in the interior panelboard, be

installed under one set screw? If so, which code sections / articles allow this? The article & code

section above to limit only one per each set screw within the panelboard, except for the terminal

being identified for this.

QUESTION #2: If the particular panelboard is identified for this type of installation, where can I

look to verify this?

I recently observed this type of installation, where there was more than one bare copper conductor

installed under a single set screw.

Thank you for your input!

.

 

[raider1]

I have a question, ..or two for ya'll!According to Article 408.41 in the 2008 NEC & E3606.4 in the 2006 IRC: "Each grounded conductor

shall terminate within the panelboard in an individual terminal that is not also used for another

conductor. Exception: Grounded conductors of circuits with parallel conductors shall be permitted to

terminate to a single terminal if the terminal is identified for connection of more than one conductor."

This is a Residential application.

QUESTION #1: Can more than one grounded conductor, installed in the interior panelboard, be

installed under one set screw? If so, which code sections / articles allow this? The article & code

section above to limit only one per each set screw within the panelboard, except for the terminal

being identified for this.

QUESTION #2: If the particular panelboard is identified for this type of installation, where can I

look to verify this?

I recently observed this type of installation, where there was more than one bare copper conductor

installed under a single set screw.

Thank you for your input!

.

408.41 is dealing with GROUNDED conductors (Neutral) conductors. This requirement only allows a single neutral conductor to be landed under a terminal.

As for bare equipment grounding conductors many panels are listed for more than 1 equipment grounding conductors to be terminated under a single screw. This information will be found on the labeling inside of the load center or the installation instructions with the panelboard.

Chris

 

[globe trekker]

Thanks Chris for your input!

I typically do not have the installation instructions available when performing

inspections, but I WOULD like to be able to identify the approval of this type

installation. Specificically, what wording should I be looking for that grants

this approval?

.

 

[raider1]

Thanks Chris for your input!I typically do not have the installation instructions available when performing

inspections, but I WOULD like to be able to identify the approval of this type

installation. Specificically, what wording should I be looking for that grants

this approval?

.

In a load center (Residential panelboard and enclosure) you will see a label. On the label you should see something to the effect, "Equipment grounding terminals are rated for 2 #14 through #10 AWG of the same size".

I have seen some Square D load centers that were rated for 3 #14 bare equipment grounding conductors under a single terminal. Keep in mind that most of the instructions that I have seen prohibit mixing different sized conductors under the same terminal.

Chris

 

[Gregg Harris]

Try 110.3B and 110.14A

 

[globe trekker]

Thank you Chris & Gregg! Good information, ..very helpful!

.