FAQ

The ΔT is the early streamer emission of an ESE lightning arrester, which is obtained by a test in a high voltage laboratory. The test conditions are described in Annex C of the NF C 17-102: 2011, UNE 21186: 2011 and NP4426: 2013 standards.

According with NFC 17-102: 2011, UNE 21186: 2011 and NP4426: 2013 standards, in its point 5.2.2 and C.2.2 indicates that a lightning rod to be considered an ESE lightning rod, must obtain a ΔT at least of 10 microseconds, and the maximum permissible value of (ΔT) is 60μs, although in the test have obtained superior results.

The tip of an ESE lightning rod should be located at least 2m above the protected area, including antennas, cooling towers, roofing, reservoirs, etc.

As the maximum permissible value for ΔT following the standards is 60μs, the maximum protection radius calculated may not exceed of 120m in Level IV protection.

Using the risk calculation indicated in the Annex A of the NFC 17-102: 2011, UNE 21186: 2011 and NP 4426: 2013.

In our website there is an INGESCO Software Design, which is an online program that it allows to calculate the risk assessment and also make a totally free report with GOOGLE MAPS.

The protection levels of an ESE lightning rod are the safety factors to be applied to minimize the risk of damages due lightning strikes on a structure. Protection levels for lightning protection have a range from Level I to Level IV. Being the Level I the strictest level and the level that provides a greater efficiency.

Each country has its own regulations on ESE lightning rods, the most applicable standards being the French NFC 17102: 2011, the Spanish UNE 21186: 2011 and the Portuguese NP4426: 2013. In the same way, there are regulations, standards or specific laws of each country, which coexist with international standards and can be completed or specified as is the case in Spain of the CTE SUA 08 (Mandatory regulations).

All information on current standards here.