Protection against the spreading of fire
Resistance to ground R2-Procedure B-DIN EN 1081 measurement of
the resistance to ground R2on the installed floor covering.
The electricity resistance of an installed floor covering is measured
between an electrode on the surface and the ground. The tripod-type
electrode is set on the dry floor covering (48 hrs after installation) and
connected to the resistance measuring instrument. The connection to
the ground is also linked to the resistance measuring instrument. Before
the voltage is switched on, the tripod-type electrode has to be loaded
with at least 300 N (test person).
With values of 1010 Ω, the charging of individuals can decay in approximately
one second. Below 108 Ω, a covering is sufficiently conductive
to prevent any risks of ignition with inflammable dusts or gases by
electrostatic charges when being walked on. Below 106 Ω, a covering is
suited even for storage and production rooms of explosives. The respective
requirements by the trade associations (e.g. ZH 1-200), electronics
manufacturers, and users must all be complied with.