Mar 31, 2015
An inverter takes the DC current produced by the PV modules and converts it to AC current for connection to the utility grid.
Mar 10, 2015
When wiring PV modules in series (to create a series string of modules), voltage is additive while current remains the same. Series = Adds Voltage. When wiring several strings in parallel, the result is the opposite; voltage remains the same while current is additive.
Jan 30, 2015
Section 110.21(B) states that if caution, warning, danger signs or labels are required by the NEC, the labels shall “adequately” warn of the hazard using effective words and/or colors and/or symbols.
Dec 29, 2014
Here are the 6 most common violations that inspectors see in an above-grid ceiling inspection:
Nov 26, 2014
The fact that the table was removed is neither here nor there. More importantly is how to apply the 83% and when the Code section allows us to use it. Applying 310.15(B)(7) to one-family dwellings or the individual dwelling units of two-family and multi-family dwellings, has always been dependent on a few important factors:
Oct 21, 2014
Here are the top 5 most common problems that arise and how they relate to the NEC:
Sep 26, 2014
If the point of interconnection will be made at a feeder, other than the opposite end of the primary overcurrent protective device (OCPD), then there are two options and both apply only to the portion of feeder on the load side of the inverter output connection.
Aug 22, 2014
Let’s start out with the first basic requirement in 705.12(D)(2): 125% of the inverter output circuit current must be used for the ampacity calculations for most of the interconnection methods used. Whether interconnecting the Inverter Output Circuit through a breaker at the service panel or directly to a feeder, it is important to first know the inverter output circuit current.
