電氣裝置或電氣線路帶電部分的某點與大地連接、電氣裝置或其它裝置正常時不帶電部分某點與大地的人為連接都叫接地；亦可說成電力設備、桿塔或過電壓保護裝置用接地線通過埋入地中并直接與大地接觸的金屬導體與大地連接。電力系統中接地的部分一般是中性點，也可以是相線上的某一點，電氣設備的接地部分則是正常情況下不帶電的金屬導體，一般為金屬外殼。 Electrical equipment or electrical circuit electrically charged part of some point connects to the earth, electrical device or other device is charged with the earth at some point when normal human connections are called grounding; Can be said to electric power equipment, tower or overvoltage protection grounding line through to dive in and direct contact with the metal conductor and earth connection. Is generally neutral point grounding part of power system, it can also be a point on the phase line, grounding part of the electrical equipment is not normally charged metal conductor, generally for the metal shell. 　　1、電氣設備接地技術原則 1, the principle of electrical equipment grounding technology 　　1.1 不同用途和不同電壓的電氣設備，除有特殊要求外，一般應使用一個總的接地體，按等電位聯接要求，應將建筑物金屬構件、金屬管道與總接地體相連接。 1.1 different USES and different voltage of electric equipment, in addition to have special requirements, the general should use a general earthing body, according to the requirements of equipotential connection, building hardware, metal pipe should be connected to total grounding system. 　　1.2 人工總接地體不宜設在建筑物內，總接地體的接地電阻應滿足各種接地中最小的接地電阻要求。 1.2 artificial total grounding body should not be located in buildings, the grounding resistance of grounding body should always meet the requirements of the least of all kinds of earthing grounding resistance. 　　1.3 為保證人身和設備安全，各種電氣設備均應根據國家標準GB14050《系統接地的形式及安全技術要求》進行保護接地。保護接地線除用以實現規定的工作接地或保護接地的要求外，不應作其它用途。 1.3 in order to ensure the safety of person and equipment, all kinds of electrical equipment shall be according to the national standard GB14050 "system grounding and safety technical requirements in the form of" to protect the earth. Protective grounding line in addition to the used to make the work rules or grounding protection requirements, should not for other purposes. 　　2、電氣設備接地裝置的技術要求 2, electrical equipment, earthing device of technical requirements 　　2.1 易燃易爆場所的電氣設備的保護接地。①易燃易爆場所的電氣設備、機械設備、金屬管道和建筑物的金屬結構均應接地，并在管道接頭處敷設跨接線。②在1kV 以下中性點接地線路中，當線路過電流保護為熔斷器時，其保護裝置的動作安全系數不小于4，為斷路器時，動作安全系數不小于2。③接地干線與接地體的連接點不得少于2個，并在建筑物兩端分別與接地體相連。④為防止測量接地電阻時產生火花引起事故，需要測量時應在無爆炸危險的地方進行，或將測量用的端鈕引至易燃易爆場所以外地方進行。 2.1 electrical equipment protective earthing of flammable and explosive place. (1) of flammable and explosive place electrical equipment, mechanical equipment, metal pipes and the structure of the metal structure are connected to, and in pipeline laying joint jumper. (2) under 1 kv neutral point grounding line, when circuit overcurrent protection for fuse, its protection action safety coefficient is not less than 4, for circuit breaker, the safety coefficient of not less than 2. (3) main grounding and grounding connections shall not be less than 2, and both ends respectively connected to the earthing body in building. (4) in order to prevent accidents caused by produce sparks when measuring grounding resistance, need to measure should be in no explosion dangerous place, or will be used in measuring the outside button to flammable and explosive place.