david
Senior Member
- Location
- Pennsylvania
In Pennsylvania we are under the 2008 but we are 20 minutes from the Ohio line and we are getting a lot of questions from the guys in Ohio who work in both PA and Ohio about the 2014 code.
I have looked very closely at the language in 2008 setting article 690 aside for a minute.
I am told to do a calculation add the sum of the amp rating of the overcurrent devices suppling the panel board. Then depending on the result im told where the breaker could be placed in the panel.
Then for series rated panels it simply tells me to do the same thing with language making it clear that the value to use for the up stream panels is rating of the first overcurrent device directly connected to the output of a utility-interactive inverter
So all this section is telling me in relation to the up stream panel breakers is move the breaker to the opposite end on the buss away from the main feeder Or main over current device
So there is no language in article 705 2008 that directs me to extend the 120% rule up stream towards the service panel so look at article 690 in 2008 and the language there tells me to extend the 120% rule upstream
The language in 2008 about series panels and buses and conductors may have been there to direct you to the correct overcurrent device in doing up stream calculations. But in 2014 you place this information under a section that its sole content is about the panel that the inveter output is connected to, you are only left with common sense to apply it upstream.
Most of us would like to have something in writing when we are told the code requires it.
Anyhow you guys helped the OP on this and gave me something to think about when trying to explain to guys under the 2014 the section requires you to apply this calculation upstream
Article 690 2008
Bus or Conductor Rating. The sum of the ampere ratings of overcurrent devices in circuits supplying power to a busbar or conductor shall not exceed 120 percent of the rating of the busbar or conductor. In systems with panelboards connected in series, the rating of the first overcurrent device directly connected to the output of a utility-interactive inverter(s) shall be used in the calculations for all busbars and conductors.
Article 705 2008
(7) Inverter Output Connection. Unless the panelboard is rated not less than the sum of the ampere ratings of all overcurrent devices supplying it, a connection in a panelboard shall be positioned at the opposite (load) end from the input feeder location or main circuit location. The bus or conductor rating shall be sized for the loads connected in accordance with Article 220. In systems with panelboards connected in series, the rating of the first overcurrent device directly connected to the output of a utility-interactive inverter(s) shall be used in the calculations for all busbars and conductors. A permanent warning label shall be applied to the distribution equipment with the following or equivalent wording:
I have looked very closely at the language in 2008 setting article 690 aside for a minute.
I am told to do a calculation add the sum of the amp rating of the overcurrent devices suppling the panel board. Then depending on the result im told where the breaker could be placed in the panel.
Then for series rated panels it simply tells me to do the same thing with language making it clear that the value to use for the up stream panels is rating of the first overcurrent device directly connected to the output of a utility-interactive inverter
So all this section is telling me in relation to the up stream panel breakers is move the breaker to the opposite end on the buss away from the main feeder Or main over current device
So there is no language in article 705 2008 that directs me to extend the 120% rule up stream towards the service panel so look at article 690 in 2008 and the language there tells me to extend the 120% rule upstream
The language in 2008 about series panels and buses and conductors may have been there to direct you to the correct overcurrent device in doing up stream calculations. But in 2014 you place this information under a section that its sole content is about the panel that the inveter output is connected to, you are only left with common sense to apply it upstream.
Most of us would like to have something in writing when we are told the code requires it.
Anyhow you guys helped the OP on this and gave me something to think about when trying to explain to guys under the 2014 the section requires you to apply this calculation upstream
Article 690 2008
Bus or Conductor Rating. The sum of the ampere ratings of overcurrent devices in circuits supplying power to a busbar or conductor shall not exceed 120 percent of the rating of the busbar or conductor. In systems with panelboards connected in series, the rating of the first overcurrent device directly connected to the output of a utility-interactive inverter(s) shall be used in the calculations for all busbars and conductors.
Article 705 2008
(7) Inverter Output Connection. Unless the panelboard is rated not less than the sum of the ampere ratings of all overcurrent devices supplying it, a connection in a panelboard shall be positioned at the opposite (load) end from the input feeder location or main circuit location. The bus or conductor rating shall be sized for the loads connected in accordance with Article 220. In systems with panelboards connected in series, the rating of the first overcurrent device directly connected to the output of a utility-interactive inverter(s) shall be used in the calculations for all busbars and conductors. A permanent warning label shall be applied to the distribution equipment with the following or equivalent wording: