Lightning Protection Zones and Classes Of Surge Protectıon Devices and Installation

LPZ 0_A : Zone where the threat is due to the direct lightning flash and full lightning                                        electromagnetic field. The internal systems may be subjected to full or partial lightning surge current

LPZ 0_B  :Zone protected against direct lightning flashes but where the threat is the full                                             lightning electromagnetic field. The internal systems may be subjected to partial lightning current surge currents.

LPZ 1 : Zone where the surge current is limited by current sharing and by isolating interfaces and/or SPDs at the boundary. Spatial shielding may attenuate the lightning electromagnetic filed.

LPZ 2,…, n :Zone where the surge current may be further limited by current sharing and by isolating interfaces and/or additional SDPs at the boundary. Additional spatial shielding may be used to further attenuate the lightning electromagnetic field.

SELECTION OF SPD ACCORDING TO ZONES

• Type 1 regarding EN 61643-11 (2011/03)

Class I regarding IEC 61643-1

LPZ 0 :1Lightning current arrestor (B)

• Type 2 regarding EN 61643-11 (2011/03)                       

Class II regarding IEC 61643-1

LPZ 1 : 2 Surge arrestor (C)

• Type 3 regarding EN 61643-11 (2011/03)

class III regarding IEC 61643-1

LPZ 2 : 3 Surge arrestor   (D)

Also discover have very importance for SPD selection.You can ask ‘How to find the right arrestor?’

First of all Earthing Conditions affect to SPD TYPE. SPD selection may vary by sytem type (TT, TNC, TN-C-S, IT ). An other point is your SPD protection Level. For exampe you need Type 1 surge arrester but your Imax value is very important. 100 kA, 50 kA, 75 kA… first of all you have to calculate your riks position and wheather habits.

Also discover have very importance for SPD selection.You can ask ‘How to find the right arrestor?’

First of all Earthing Conditions affect to SPD TYPE.SPD selection may vary by sytem type (TT, TNC, TN-C-S, IT ). An other point is your SPD protection Level. For exampe you need Type 1 surge arrester but your Imax value is very important.100ka, 50ka, 75ka etc…; first of all you have to calculate your riks position and wheather habits.