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Overview of Commercial Electrical Systems

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9:10
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MASTER ELECTRICIAN DAD TEACHES HIS SON THE SECRET HOW TO DEAL WITH COMMERCIAL ELECTRIC!

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What happens here

Understand the full electrical system of commercial buildings. For example, a common setup in the United States is a 480-volt, 4-wire system. This provides 277 volts from phase to neutral/ground for lighting. To power standard 120-volt receptacles, a Delta-Y dry-type transformer is used. This transformer steps down the 480-volt power (or 277-volt phase-to-neutral power) to 120/208 volts. Some smaller industrial facilities might directly receive 120/208 volts from the utility, but large facilities typically use higher voltages for efficiency and then step down as needed.

Goal: Gain a foundational understanding of common commercial electrical systems.

Tools and materials

  • Dry Type Transformer — To step down higher voltages (e.g., 480V) to lower voltages (e.g., 120/208V)

What they say

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with a circuit breaker that's going to feed a transformer that's going to step that power down to 12208. >> Okay. Okay. >> Right. And those 120 is what we use to feed our receptacles. >> All right, that makes sense cuz I was in this commercial warehouse and I see these things on the wall and I was wondering what they were, but they're transformers. That's what it is. >> Yeah. The gray those gray enclosures. >> Yeah. Yeah. Yeah. Every every place has to have that. Now, some smaller industrial facilities >> will bring in 120 208 automatically from the utility company. Okay. Right. So, they're they don't have the ability to do 480. They're at a disadvantage. >> Okay. >> Right. Because their voltage is lower, their current is higher, their services need to be more beefier. M. >> So, it's always better to use the highest voltage for the most efficiency and the least voltage drop. >> That makes a lot of sense. All right. Thanks, Dan. [Music]

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