Install the Level 3 surge protection device inside the equipment or at the equipment's power supply input, especially for critical or sensitive electronic devices. Technical Requirements Maximum discharge capacity: 20kA per phase or lower. Voltage protection level: ≤ 1800V. Among other things, normative requirements regarding line lengths, effective protection areas and fuse protection of surge protection devices must be observed. This prevents interference from being coupled. Whether residential buildings, commercial units, or industrial facilities: ELTAKO surge arrestors keep sensitive devices, high-performance consumers, and modern power generation systems safely pro-tected – compliant with standards, fl exible and powerful. LPZs describe how lightning surge energy is progressively reduced inside a building or facility.