Low Voltage Lighting, Part 7

Low Voltage Lighting, Part 7

In our previous issue, we said that LV systems are covered by Article 411. The requirements actually begin with 411.3. The title of 411.3 seems to overlap with the title of Article 411. This subsection was added with the 2014 NEC, which also dropped 411.2 from the 2011 NEC. The 2014 revisions are confusing in […]

Are You Qualified?

Are You Qualified?

Many people think that if they’ve been given an assignment, they are qualified to do it. While this should be true, not every supervisor makes it that way. If your supervisor determines you are not a qualified employee, you are not a qualified employee. That’s because meeting the standard of “qualified” includes several requirements and […]

Be in Charge of Your Safety When in a Battery Room

Be in Charge of Your Safety When in a Battery Room

It’s increasingly common to find onsite power generation and battery backup systems. Both the memory of blackouts and the looming prospect of more have driven many companies to install a battery system onsite. It’s no longer the case that you find these almost solely at data centers and hospitals. Unfortunately, batteries pose special dangers such […]

NEC Calculation Requirements, Part 11

NEC Calculation Requirements, Part 11

We’ve been walking through the NEC from page 1 to see which requirements affect circuit calculations and how they do that. By now, it should be apparent that these are mostly load calculations. We left off with Article 210, in our previous issue. Does Article 215 affect your calculations? Only a little bit. Let’s see […]

Motors, Part 15

Motors, Part 15

Across the line starts of large motors can wreak havoc with the distribution system in a facility. In fact, they usually do. If you have large motors in your facility and they start across the line, look at the power signatures at various points in the facility. Even on different feeders, you may see significant […]