Company Address: Room 601, Floor 6, Building F, Songbai Road 1008, Sunshine Community
，
Xili Street, Nanshan District, Shenzhen(518108)
Factory Address: Fl1, Bldg B, Wentao Industrial zone, Yingrenshiyongxin Village, Shiyan Street, Baoan district, Shenzhen, Guangdong, China (518055)
Tel: +86-755-26014509/4710/4711 Fax:+86-755-26014506
Website: www.cdatatec.com
6
2.2.1.3 EOC Master Grounding Requirements
Index
Item
Specifications
1
Equipment
grounding protection
When there is a ground bar in the installation
environment of the device, which uses a yellow-green
two-color protective ground cable to directly connect to
the ground bar. If you need to make a protective ground
cable on site, the cross-sectional area is not less than 6
㎡
, and the length should not exceed 3m.
When there is no grounding bar in the installation
environment where the equipment is located, angle
steel or steel pipe with a length of not less than 0.5m
can be directly driven into the ground. The yellow-green
two-color protective grounding cable of the equipment
should be connected to the angle steel by electric
welding, and the welding points shall be anti-corrosive.
The cross-sectional area of the protective ground cable
is not less than 6
㎡
. The cable should be as short as
possible during project construction and cannot be
coiled.
2
Grounding resistance
The grounding resistance value should be less than 5
Ω
, but for areas where the annual thunderstorm day is
less than 20 days or for angle steel that penetrates into
the ground, the grounding resistance can be less than
10
Ω
. For places with high soil resistivity,it is advisable
to sprinkle some saline or drag reducing agent around
the earth to reduce the resistivity of the soil.
The upper end of the grounding body should be not
less than 0.7m from the ground. In cold areas, the
grounding body should be buried below the frozen soil
layer.
3
Earthing connection
The ground lead is a metal conductor that connects the
ground grid to the ground bar. The length of the ground
lead-in wire does not exceed 30m, and its material
should be galvanized flat steel with a cross-sectional
area of 40mm*4mm or 50mm*5mm. The ground bar of
the equipment and the grounding lead-in should be
