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Topics - Arvore

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1
Page 64, second paragraph, header reads, "PV Power Source Maximum Circuit Current". Should be, "PV Power Output Maximum Circuit Current".

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Section 4: Installing Electrical Components / Include 690.35 Exception
« on: March 22, 2012, 04:03:24 PM »
On page 92, first paragraph, the requirement that "one conductor of a 2-wire system...must be grounded if the maximum PV system voltage is over 50V (NEC 690.41)." It might be good to include the exception (690.35) here, as well. In all fairness, this exception is mentioned in the following page; however, it might be beneficial to mention the exception in context with 690.41. I think it would make it less confusing.

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Section 9: Study Guide Review Questions / Question #5 Error?
« on: March 22, 2012, 03:43:30 PM »
From my perspective, this problem should have used "Latitude -15" in its calculation. If we go with the understanding that an "at latitude" tilt results in a 41.53 degree array tilt, then in this example, with the roof being at 26 degrees (which just happens to be 15 degrees less than latitude) we should use a solar irradiation of 4.8 hours based on the "latitude -15". Figure 14 on page 17 bears this out. Any dissenting view points?

4
Where did the 9A of continuous current value come from (paragraph 3). If we're still using the original source circuit example, the continuous current should be 10.5A (8.41 x 1.25).

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Section 2: Verify System Design / Bypass Diodes Figure 67 (page 56)
« on: March 17, 2012, 01:57:15 PM »
The bypass diodes depicted are configured incorrectly, i.e. they're forward biased. During normal (unshaded) operation, bypass diodes are reversed biased (not conducting). During a shading event, the bypass diode corresponding to the shaded cell(s) becomes forward biased and conducts current from the unshaded cells.

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