Screened camera is a room for researches of bioelectric phenomena, the walla of which are shielding the chamber content (living organisms, units) from the affect of external electro-magnet fields. Resistance of the grounding device for such chambers should be 4 Ohm maximum. The ZANDZ Technical Center has recently received a request to calculate grounding for one of such screened chambers. Let's study the solution offered by our specialists.
Example of calculation of grounding for a screened chamber
Object: screened camera
Task: Carry out a grounding device with the resistance not exceeding 4 Ohms.
Measures on provision of requirements to the grounding system of a screened camera:
1. Grounding is made in accordance with the EIC 7th ed.
2. Installation of 5 vertical electrodes 6 m long united by a horizontal electrode (copper-bonded tape 30x4 mm). The distance from the horizontal electrode to the object shaould be not less than 1 m, deepening 0.5 - 0.7 meters.
Grounding device calculation resistance:
The design resistance of the grounding device is 3,61 ohms.
Figure 1 shows the arrangement of equipment.
Chart 1 gives the list of the required equipment and materials for grounding of the screened chamber.
Figure 1 - Location of equipment for the screened chamber grounding.
Chart 1 - List of equipment and materials.
|№||Image||Product item||Product||Quantity, pcs.|
|1.||ZZ-001-065||ZANDZ Copper-coated threaded grounding rod (D14; 1.5 m)||20|
|2.||ZZ-002-061||ZANDZ Threaded coupler||16|
|3.||ZZ-003-061||ZANDZ Starting tip||5|
|4.||ZZ-004-060||ZANDZ Driving head for a jackhammer||4|
|5.||ZZ-006-000||ZANDZ Conductive grease||2|
|6.||ZZ-008-000||ZANDZ Header for a jackhammer (SDS max)||1|
|7.||ZZ-005-064||ZANDZ Clamp for connecting conductors (up to 40 mm)||7|
|8.||ZZ-007-030||ZANDZ Waterproof tape||2|
|9.||GL-11075-20||GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 20 meters)||1|
|10||GL-11075-10||GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 10 meters)||1|
|11.||ZZ-500-110||ZANDZ Grounding conductor (10m; S25, single-core, with a tip for the bolt D8)||1|
Do you have any questions on grounding of screened chambers? Please contact our ZANDZ Technical center!