May 29, 2015
A PV system is useless until it gets connected into the premises wiring system. NEC section 690.64 states that the point of connection for a PV system shall be in accordance with section 705.12. Article 705 provides the rules on how an electric power production source, such as a PV...
Apr 29, 2015
In the past few blog posts we have discussed some of the more important issues related to the PV system including PV modules, PV source circuits, PV output circuits, and inverters. Now let’s talk about PV grounding. Equipment GroundingIn most PV installations, the PV modules are fastened to a metal rack-type...
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:
