What's surge protection Requirements

The measures against direct flash and intrusion of lightning current are as follows:

Install surge protector nets or bands at the positions susceptible to lightning strikes. Install surge protection wires or lightning rods on the top of chimneys and antennas that are on top of buildings. Ensure that the cross-sectional area of each down conductor of a surge protector is not smaller than 2 mm2 and the space between the conductors is not greater than 30 meters.

Use a surge protector with the ground resistance of less than 10 ohms.

Ground outdoor cables and metal pipes before they enter the TR, and install surge protectors at the inlet of the TR when outdoor overhead cables are brought to the TR.

Use roof plates, beams, and pillars made of reinforced concrete and reinforcement bars as the down conductor of lightening arresters if possible.

The measures against lightning strikes from the side are as follows:

Connect the external metal window frame to the down conductor of surge protectors.

Place surge protection metal bands horizontally at a definite spacing on the outside wall along the height of the building.

It is recommended that a joint ground system be used for the lightening protection of the TR building. A joint ground system connects the telecom power grounding, protection grounding, surge protection grounding of the TR building, and grounding of the power-frequency AC power supply system. The ground resistance of a joint ground system should not exceed 10 ohms.

It is recommended that reinforcement bars in the walls and pillars of the TR building be used as down conductors for lightening protection. These conductors should be electrically connected so as to equalize the electric potential in the building.

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