Hello.
I've been posting on this forum for around 15 years and been in the industry for longer. However, Solar / PV systems simply is not my specialty and out of all the codes I know in the NEC - The PV/Solar one is not one of them - so im looking for some help.
I own a home in Florida so I hired a company to install solar panels. However, the company hired an Engineer, and the Engineer is on his 3rd rejection with the City. His rejections are a bit ambiguous so im looking for someone to see if these rejections are valid.
Im posting the rejections, in addition to the latest set of drawings that were submitted.
ANY help would be appreciated. Please note that im attaching the drawings but I extracted just the riser / panel schedule pages.
Drawings Attached:
REMAINING REVIEW COMMENTS (3RD SUBMITTAL):
COMMENT #1
2017 NEC: 1- Please provide a panel schedule for both the MSP and MDP to substantiate the requirements of 705.12(B)(2)(3)(c). 2- Please provide the bus rating of the MSP. 3- Please provide the MCB rating of the MSP. 4- The label sheets needs to include the required labeling per Article 705.
COMMENT #2
705.12(B)(3)(c) requires that the sum of all OCPD's supplying and/or being supplied by are factored for. The ATS which supplies the MDP is being supplied by the feeders terminated on the feed through lugs that are connected to the MSP's busbar. Please provide a panel schedule for the MDP and factor for those OCPD's.
COMMENT #3
705.12(B)(3)(6) of the 2020 NEC clarifies the interconnection rules for busbars. You are permitted backfeed a circuit breaker at the feed through panel, but there needs to be an OCPD at the supply end of the feed through conductors that is rated no larger than the rating of the feed through conductors. For example, if you were to add 175A breaker on the subpanel that is being fed from the feed through conductors you would be compliant. Code Language-Connections shall be permitted on busbars of panelboards that supply lugs connected to feed-through conductors. The feed-through conductors shall be sized in accordance with 705.12(B)(1). Where an overcurrent device is installed at the supply end of the feed-through conductors, the busbar in the supplying panelboard shall be permitted to be sized in accordance with 705.12(B)(3)(1) through 705.12(B)(3)(3)
I've been posting on this forum for around 15 years and been in the industry for longer. However, Solar / PV systems simply is not my specialty and out of all the codes I know in the NEC - The PV/Solar one is not one of them - so im looking for some help.
I own a home in Florida so I hired a company to install solar panels. However, the company hired an Engineer, and the Engineer is on his 3rd rejection with the City. His rejections are a bit ambiguous so im looking for someone to see if these rejections are valid.
Im posting the rejections, in addition to the latest set of drawings that were submitted.
ANY help would be appreciated. Please note that im attaching the drawings but I extracted just the riser / panel schedule pages.
Drawings Attached:
REMAINING REVIEW COMMENTS (3RD SUBMITTAL):
COMMENT #1
2017 NEC: 1- Please provide a panel schedule for both the MSP and MDP to substantiate the requirements of 705.12(B)(2)(3)(c). 2- Please provide the bus rating of the MSP. 3- Please provide the MCB rating of the MSP. 4- The label sheets needs to include the required labeling per Article 705.
COMMENT #2
705.12(B)(3)(c) requires that the sum of all OCPD's supplying and/or being supplied by are factored for. The ATS which supplies the MDP is being supplied by the feeders terminated on the feed through lugs that are connected to the MSP's busbar. Please provide a panel schedule for the MDP and factor for those OCPD's.
COMMENT #3
705.12(B)(3)(6) of the 2020 NEC clarifies the interconnection rules for busbars. You are permitted backfeed a circuit breaker at the feed through panel, but there needs to be an OCPD at the supply end of the feed through conductors that is rated no larger than the rating of the feed through conductors. For example, if you were to add 175A breaker on the subpanel that is being fed from the feed through conductors you would be compliant. Code Language-Connections shall be permitted on busbars of panelboards that supply lugs connected to feed-through conductors. The feed-through conductors shall be sized in accordance with 705.12(B)(1). Where an overcurrent device is installed at the supply end of the feed-through conductors, the busbar in the supplying panelboard shall be permitted to be sized in accordance with 705.12(B)(3)(1) through 705.12(B)(3)(3)