TECHNICAL SECTION
79
— Technical section EMI screen system & fire performance
EMI screen system For applications where electromagnetic interference is of particular concern we have classified suitable conduit systems by means of symbols. These are related in an ascending scale of performance from Standard EMI Screen (products featuring a stainless steel overbraid) through to High EMI Screen (products featuring a tinned copper overbraid). Contact us for full details.
Standard EMI Screen
Enhanced EMI Screen
High EMI Screen
Screening level 40db @ 100MHz
Screening level 60db @ 100MHz
Screening level 75db @ 100MHz
Fire performance Adaptaflex has introduced a set of symbols to help the user specify conduit systems for installations where fire performance is of particular concern. Each symbol encompasses a range of properties relevant to the high specification materials used in the construction of the conduit.
They are in an ascending scale of performance from Low Fire Hazard (LFH) featuring zero halogen through to Super Low Fire Hazard (SLFH) featuring zero nitrogen. In addition, Inherent Low Fire Hazard systems (ILFH) are classified as being all metal systems.
Low Fire Hazard
Enhanced Low Fire Hazard
Super Low Fire Hazard
Inherent Low Fire Hazard
Property
LFH
ELFH
SLFH
ILFH
Inherent Low Fire Hazard
Oxygen Index ISO4589
31% ≥ OI ≥ 28% 0.02 ≥ A0 ≥ 0.03
OI ≥ 32%
OI ≥ 32%
0.005 ≥ A0 ≥ 0.02
0.02 A0 ≤ 0.005
BS6853 Smoke Density 3m 3
i.e. Type S, SS, SPB STC, SSB & SSBGS Metallic conduit & fittings
Zero Halogen Zero Phosphorus Zero Sulphur London Underground
Concession 5.0 ≥ TI ≥ 6.0
Approved
Approved
Toxicity Index NES713 Issue 3
0.5 ≥ TI ≥ 5.0
TI ≤ 0.5
NFF16-102
I3F2
I2F2
I2F1
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