Grounding Electrodes and Grounding Electrode Systems All grounding electrodes present at a building or structure must be bonded together to form a grounding electrode system, as required by NEC® Section 250.50. Doing so eliminates voltage gradients, and also improves reliability and grounding performance over time by creating redundancy. If one electrode is damaged, destroyed by corrosion, or removed, other electrodes are available to maintain the all-important connection from the service equipment to ground. Section 250.53(B) states that two or more grounding electrodes effectively bonded together are considered a single grounding electrode system. Permitted Electrodes The NEC recognizes the following seven types of grounding electrodes [250.52(A)]: Metal underground water pipe Metal frame of a building or structure Concrete-encased electrodes Ground ring Rod and pipe electrodes Plate electrodes Other local metal underground systems or structures (piping, tanks, well casings, etc.)
You can find good online web design schools at: www.ComputerTrainingSchools.com
You can go to insurance.com to find good and affordable life insurance online
Someone can find good online backup services by searching the internet for the best services.
You can find good English learning tutorials online, but you have to pay for the conversation course.
Yes, you can find good mats online and eBay is often the best place to start.
go online and find out
There are a number of good agents and agencies. There is a directory that you can find online.
You can find some good restaurant coupons online at the official Restaurant website. You can also find these coupons online at websites such as Retail Me Not and Surviving the Stores.
just go to google tranlater
you can find them online
You can find them at ebay or at craigslist.org.
www.passged.com is a good site.