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MessagePosté le: Mer 21 Juin - 05:06 (2017)  Stallcup's Chapter Sixteen Designing Electrical Systems - 2 --> Répondre en citant

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Grounding

Equipment and circuits that are grounded and bonded properly are protected from lightning storms and excessive surges of voltages. Property is also protected and safety for people is provided. There are three grounding schemes in a well-designed and -installed grounding system, and they are as follows:
&#x2022; Circuit and system grounding
&#x2022; Equipment grounding
&#x2022; Bonding supply and load side

There are types of conductors per the NEC that, if sized and selected correctly, may be used as a network to ground and bond electrical systems for safety.

Before attempting to design and install the elements of an effective grounding scheme, the following definitions of ground, grounded (grounding), grounded conductor, grounding conductor, bonded (bonding), and equipment grounding conductor per Article 100 and 250.2 must be reviewed very carefully. These definitions are related to the grounding and bonding of the electrical system and equipment.

Ground is defined as the earth.

Grounded (grounding) is defined as connected (connecting) to earth or to a conducting body that extends the ground connection.

Grounded conductor is defined as a system or circuit conductor that is intentionally grounded.

Bonded (bonding) is defined as connected to establish electrical continuity and conductivity.

Equipment grounding conductor (EGC) is the conductive path(s) installed to connect normally noncurrent-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor or both.

When grounding and bonding electrical systems for safety, such grounding and bonding procedures shall be done at the following locations:
&#x2022; Service equipment
&#x2022; Separately derived system
&#x2022; Separate buildings or structures
&#x2022; Supply side of disconnect mean(s) and overcurrent protection device
&#x2022; Load side of overcurrent protection device

Note, 250.4(A)(1) through (A)(5) contains the general practices of grounding and bonding electrical systems for safety and this chapter deals with grounding and bonding of these locations as well as other methods of grounding.


Details:
rank:
price: $18.13
bound: 98 pages
publisher: GRAYBOY, INC. (April 30, 2017)
lang: English
asin: B072HLRPZX
isbn:
weight:
filesize: 11099 KB




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