# SCREENED CHAMBER GROUNDING

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.

Solution:

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