# Grounding of tomograph, x-ray machine and other medical equipment of a hospital

Grounding devices for the protection of medical equipment - tomographs, x-ray machines and other highly sensitive equipment - should provide low resistance. The documents for such equipment often indicate that the required resistance for it should not exceed 2 ohms. The ZANDZ Technical Center recently received a request to achieve this level for one of the hospitals. We proposed to use a large number of grounding electrodes with a length of 6 m. Let's study this solution in more detail.

# Calculation example of grounding for the hospital medical equipment

Object: Hospital in Moscow.

Perform a grounding device for the hospital, providing the resistance of not more than 2 ohms

## Solution:

A set of measures to ensure the necessary requirements for the grounding system of the hospital medical equipment:

1. Grounding is made in accordance with the EIC 7th ed.

2. Installation of a grounding device consisting of 10 vertical electrodes 6 m long united by a horizontal electrode (copper-bonded tape 30x4 mm). The distance from the horizontal electrode to the facility shall not be less than 1 m, deepening 0.5 - 0.7 meters.

Hospital's grounding device resistance calculation:

The design resistance of the grounding device is 1,96 Ohm..

Figure 1 shows the arrangement of equipment.

Table 1 gives the list of the required equipment and materials.

Location of equipment for hospital grounding.

Подключить к главной заземляющей шине – connect to the main grounding bus
Электрод - electrode
Полоса омедненная 30 на 4 – copper-bonded tape 30 to 4

Table 1 - List of equipment and materials for hospital grounding.

 № Fig. Product item Name Quantity, pcs 1. ZZ-001-065 ZANDZ Copper-coated threaded grounding rod (D14; 1.5 m) 40 2. ZZ-002-061 ZANDZ Threaded coupler 31 3. ZZ-003-061 ZANDZ Starting tip 10 4. ZZ-004-060 ZANDZ Driving head for a jackhammer 8 5. ZZ-006-000 ZANDZ Conductive grease 4 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) 14 8. ZZ-007-030 ZANDZ Waterproof tape 4 9. GL-11075-50 GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 50 meters) 1 10. GL-11075-20 GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 20 meters) 2