http://www.solarabcs.org/about/publi...map/index.html
McGraw-Hill’s
NATIONAL ELECTRICAL CODE® 2011 HANDBOOK
690.7 SOLAR PHOTOVOLTAIC (PV) SYSTEMS Page 1445
690.7. Maximum Voltage. Modules are rated under standardized laboratory conditions at moderate temperatures. The photochemistry of the crystalline forms of silicon is such that under conditions of constant irradiance, the voltage increases as the temperature drops. For NEC application purposes, at a temperature of about –40°C or °F (the temperature scales cross at this point) is generally considered the worst case, and at this temperature the open circuit voltage put out by a photocell is about 125 percent of its rated voltage. For areas with other design temperature minimums, the table factors can be used accordingly. However, the 125 percent factor is the one usually applied. If the module comes with directions to use different adjustments, then those directions trump the numbers in Table 690.7. Looking at Fig. 690-1, the open-circuit rated voltage on a module is given as 64 V. The panel with four modules wired in series will generate 256 V under test conditions. However, applying the125 percent factor gives a final result of 320 V, and that becomes the voltage rating of the PV output circuit derived from this system. An informational note points to an ASHRAE publication that is useful in determining the extreme cold weather temperature that would be applicable in any locality.
I used the last two points below
• However, applying the125 percent factor gives a final result of 320 V, and that becomes the voltage rating of the PV output circuit derived from this system.
• For areas with other design temperature minimums, the table factors can be used
accordingly.
• An informational note points to an ASHRAE publication that is useful in determining the extreme cold weather temperature that would be applicable in any locality.
I am going to look at this link you provided.
Is there a section in the code i need to look at other than 690.7 that will tell me not to calculate as laid out in 690.7?