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A server room is a telecom room wherein much active telecom equipment is located. The grounding of the server room is mandatory according to the EIC. Fail-safety of the informational support and a good condition of the equipment depend on its design.
For such rooms, the required grounding resistance should not be more than 4 Ohms. The ZANDZ Technical Center has received a request to calculate such grounding system for a server room. According to the task, there should be a grounding system made of stainless steel and installed to the clay loam. Let's consider a solution offered by our engineers.
Grounding arrangement resistance calculation:
According to the engineering and geological survey provided by the customer, the prevailing soil type is clay loam.
The estimated soil resistivity is taken to be 100 Ohm ∙ m.
Horizontal electrode resistance:
Гор - Hor
where ρ is soil resistivity, Ohm*m;
b is horizontal electrode width, m;
h is horizontal electrode depth, m;
Lhor is horizontal electrode length, m.
Vertical electrode resistance:
Верт - Vert
where ρ is soil resistivity, Ohm*m;
L is vertical electrode length, m;
d is vertical electrode diameter, m;
T – is depth, i.e. the distance from the ground surface to the ground terminal, m;
where t is depth of the top of the electrode, m
Electrical impedance of the grounding arrangement:
ЗУ - GA
Исп гр - Util
where n – is number of sets;
kutil is utilization ratio
Ом - Ohm
Верт - Vert
ЗУ - GA
Гор - Hor
The estimate resistance of the grounding arrangement is 3.82 Ohm, which is less than the required value of 4 Ohm.
Grounding solution
Grounding is made in accordance with the EIC, Rev. 7, Chapter 1.7.
A set of measures to ensure the requirements for the grounding arrangement is based on the following solutions:
- the horizontal ground terminal made of stainless steel with a cross-section of 3x30 mm, 20 m long, at the depth of 0.5 m, is laid;
- 3 vertical electrodes (rods made of stainless steel having diameter 16 mm), 10.5 m long, are installed;
- vertical and horizontal electrodes are interconnected using clamps ZZ-005-064.
Grounding equipment layout is provided in the drawing in a separate file.
Click here to view the diagram in full.
План до перепланировки - Plan before reconfiguration
Асфальт - Asphalt
С этой стороны асфальт - Asphalt from this side
С этой стороны здания необходимо выполнить заземление для серверной - Server room grounding shall be made from this side of the building
Условные обозначения - Legend
- горизонтальный заземлитель - horizontal grounding electrode
- вертикальный заземлитель длиной 10,5 м - 10.5 m vertical electrode
- зажим для подключения проводника - clamp for connecting conductors
Table 1. List of required materials
| Item No. | Fig. | Part number | Product | Amount |
| Grounding arrangement | ||||
| 1 |  |
ZZ-502-303-25-H | ZANDZ Stainless steel bar (30*3 mm; 25 m bundle) | 1 |
| 2 |  |
ZZ-005-064 | ZANDZ Clamp for connecting conductors (up to 40 mm) | 3 |
| 3 |  |
ZZ-001-165 | ZANDZ STAINLESS STEEL Grounding rod, threaded (D16; 1.5 m; 5/8 UNC) | 21 |
| 4 |  |
ZZ-002-161 | ZANDZ STAINLESS STEEL Threaded connection couple (5/8 UNC) | 19 |
| 5 |  |
ZZ-003-061 | ZANDZ Takeoff Tip | 3 |
| 6 |  |
ZZ-004-060 | ZANDZ Guide head for jackhammer attachment | 5 |
| 7 |  |
ZZ-006-000 | ZANDZ Conductive grease | 2 |
| 8 |  |
ZZ-007-030 | ZANDZ Waterproofing tape | 1 |
| 9 |  |
ZZ-008-000 | ZANDZ Attachment to the jackhammer (SDS max) | 1 |
Do you have any questions regarding grounding of a server room or other facilities? Please contact the ZANDZ Technical Center!
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