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09:34 Mar 12, 2018
Dutch to English translations [PRO] Tech/Engineering - Electronics / Elect Eng / nuttig deel (van de aardelektrode)
Dutch term or phrase:electrical safety
Belgian training course on electrical safety. In the section on protection against electric shock, some definitions are given:
Aardelektrode : In de grond aangebracht geleidend deel dat de elektrische verbinding verzekert met de aarde
Nuttig deel v/d aardelektrode : Deel van de aardelektrode onder de vriesgrens
Dit is 60 cm onder het maaiveld
The French equivalent seems to be "partie utile" but I can find no support for the literal "useful part" so I suspect it must be something different. Vriesgrens seems to be "frost line" but doesn't narrow down the search.
So if I've understood this right, it's the part of the earth electrode that is not (or is least) affected by soil resistivity. This doc (http://www.cigre.cl/wp-content/uploads/2017/02/Brochure-Cigre-FRancia-HVDC-Electrones-675.pdf) does mention the active part of electrodes so I'll go with that. Thanks, everyone. 3 KudoZ points were awarded for this answer
electrical safety is the context. Queried term is "nuttig deel (van de aardelektrode)"
Automatic update in 00:
8 mins confidence:
Explanation: this seems the most logical
Ronald van Riet Local time: 14:07 Specializes in field Native speaker of: Dutch, English PRO pts in category: 7
So if I've understood this right, it's the part of the earth electrode that is not (or is least) affected by soil resistivity. This doc (http://www.cigre.cl/wp-content/uploads/2017/02/Brochure-Cigre-FRancia-HVDC-Electrones-675.pdf) does mention the active part of electrodes so I'll go with that. Thanks, everyone.
Explanation: I doubt that there is any "correct" translation of your term because I do not believe this is a standard technical term. I am just proposing this as an alternative to Ronald's answer. It is up to you whether you prefer active part or effective part or some other suggestion that may be made.
Textpertise United Kingdom Local time: 13:07 Works in field Native speaker of: English PRO pts in category: 12
Reference: It's all about resistance
Reference information: What affects grounding resistance?
First, the NEC code (987, 50-83-3) requires a minimum ground electrode length of 2.5 meters (8.0 feet) to be in contact with soil.
Soil composition, moisture content, and temperature all influence the soil resistivity, so it is recommended that the ground rods be placed as deep as possible into the earth to be most effective.
Nevertheless, four variables affect the ground resistance of a ground system:
1. Length/depth of the ground electrode
One very effective way of lowering ground resistance is to drive ground electrodes deeper. Soil is not consistent in its resistivity and can be highly unpredictable.
It is critical when installing the ground electrode that it is below the frost line. This is done so that the resistance to ground will not be greatly influenced by the freezing of the surrounding soil. Generally, by doubling the length of the ground electrode you can reduce the resistance level by an additional 40%.
-------------------------------------------------- Note added at 11 hrs (2018-03-12 20:57:10 GMT) --------------------------------------------------
Approximately 90 percent of all grounding electrode systems for structures are driven rods. The NEC requires all driven rods to be a minimum eight feet in the earth and for multiple connected rods a minimum spacing of six feet between rods. The width of the rod has little effect on reducing impedance to earth, however, the depth of the rod and spacing for multiple rods have a significant effect. Frozen soil has about four times the resistivity of 50 degree Fahrenheit soil. Greater distances between multiple rods also decreases the overall impedance to earth. Site Audits often encourage managers to consider installing ten foot or longer rods a minimum of eight feet below the frost line and installing multiple rods at a distance equal to their depth in the soil.