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KS-C IEC 60364-4-41 Equipotential bonding

What is Equipotential bonding?

1. The function of the “equopotential bonding busbar” is in the “patient environment”.

All “conductive parts” and “extraneous conductive parts”

They are interconnected galvanically.

In this way, if any conductive disturbance occurs, all conductive parts will have the same potential.

A patient who is in contact with two or more conductive parts will not receive hazardous current.

2. [Group 1 medical location] and [Group 2 medical location]

In accordance with the provisions of [KS C IEC 60364-7-710.413.1.6] and [Article 249 (4) of the judgment criteria for electrical equipment technical standards]

It specifies the installation of an “equipotential bonding bus bar”.

3. The node of the equipotential bonding busbar can be fulfilled as a terminal bar or copper bar with several holes.

It is located inside the wall or just outside the medical area.

4. The general rules apply to [Group 0 medical locations].

Therefore, equipotential bonding busbars are not necessary except in bathrooms or shower areas.

5. The components that can cause a potential difference are each conductor of its own,

It must be connected to an equipotential bonding busbar.

[Parts that need to be connected to the equipotential intersection]:

1. Conductive parts within the patient environment or conductive parts outside the system.

[such as hot and cold water, sewage, oxygen, medical gases, air conditioning, drywall support structures, doors and openable windows.

[Metal internal facilities excluding moving parts]

2. Even if it is installed 2.5m above, such as a conductive part of a scialytic operation light.

This also includes cases where it enters the patient environment during use.

3. Equipment (equipment) protection conductors.

4. Earth contacts of all outlets within the medical facility.

Because they can power instruments that may enter the patient environment.

5. Possibility of iron content in reinforced concrete in place

6. Metal shield placed between windings of medical isolation transformer

7. Any metal grid located under the floor (conductive tiles)

8. Non-electrical and fixed location water chamber tables not intended for insulation through grounding.

Note: In hospital accommodation (Group 1), all conductive parts, off-grid conductive parts and shielding against electromagnetic interference must be connected to equipotential bonding busbars.

This is because the patient environment must be considered as an extension of the entire room.

In the case of bathrooms and shower rooms that are functionally connected to group 1 and general rooms used by patients, equipotentialization must be achieved through local intersections.

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