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Outside Branch Circuits and Feeders, Part 1
2013-04-19 21:11:00| Electrical Construction & Maintenance
Chapter 2 of the NEC has a logical progression of five Articles that run from 210 through 230. The first three provide the requirements for branch circuits, feeder circuits, and their calculations. Article 230 provides the requirements for services. The first three Articles assume the circuits are inside a building. If they aren't inside a building but run on it or attach to it, they must also meet the requirements of Art. 225 [225.1 and Table 225.3]. read more
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feeders
Livestock Feeders See Better Times Ahead
2013-04-15 16:04:00| National Hog Farmer
Source: Stu Ellis While Corn Belt crop producers look back at USDA’s March 28 reports and wonder “what happened here,” livestock feeders are doing “high-fives” with themselves. Although the acreage projection was not unexpected, it forecast the potential for increased production and subsequently lower prices for feedgrains and soybean meal in the next marketing year, says blogger Stu Ellis at http://www.farmgateblog.com. read more
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ahead
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feeders
Sizing Feeders, Part 4
2013-02-25 22:08:00| Electrical Construction & Maintenance
In Annex D3(a), the neutrals complicate feeder sizing because we cannot assume the load is evenly distributed. Let's see just how much more complicated this becomes. After that first long paragraph, Annex D3(a) provides a summary of the loads. The first one listed is discharge lighting. This type of load has high nonlinear content, so there's substantial current flowing through the neutral. That means you must consider the neutral to be a current-carrying conductor. read more
Sizing Feeders, Part 2
2013-02-11 19:51:00| Electrical Construction & Maintenance
One reason Annex D3(a) has a more complicated example of feeder sizing is the circuit is being divided up into different runs with different temperature requirements. But another reason is the neutral calculations are complicated by the fact that the load isn't calculated on the basis of VA per square meter or square foot. Thus, 210.11(B) does not apply and we cannot assume the load is evenly distributed. Before we look at the implications of this, let's see how dividing up the circuit affects the feeder sizing for the ungrounded conductors. read more
Sizing Feeders, Part 2
2013-02-11 19:51:00| Electrical Construction & Maintenance
One reason Annex D3(a) has a more complicated example of feeder sizing is the circuit is being divided up into different runs with different temperature requirements. But another reason is the neutral calculations are complicated by the fact that the load isn't calculated on the basis of VA per square meter or square foot. Thus, 210.11(B) does not apply and we cannot assume the load is evenly distributed. Before we look at the implications of this, let's see how dividing up the circuit affects the feeder sizing for the ungrounded conductors. read more
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