Page 254 - Surge-Protection-E_0.pdf

Isolating Spark Gaps

EXFS Coaxial Connection Box
• For bridging buried insulating joints in cathodically protected
pipe sections of pipelines
• For protecting insulating joints in potentially explosive
atmospheres
• Voltage drop across the coaxial cable is up to three times
lower than across a conventional connection cable.
Depending on the insulation strength of the insulating joint,
the length of the connection cable can be up to 5 m
• The integrated EXFS 100 spark gap is thus inspected and
replaced outside the Ex area / above ground (no excavation
work needed)
Isolating Spark Gaps Coaxial connection of the Ex isolating spark gap for protecting buried insulating • Spark gap is easily accessible since cables do not have to
• Version for lightning equipotential bonding according
to IEC 62305 in hazardous areas

be disconnected and insulations do not have to be removed
joints
during inspection
• Delivery does not include fixing accessory

NAK SN4631: Coaxial connection box with integrated Ex isolating spark gap EXFS 100

The coaxial connection box with integrated Ex isolating spark gap EXFS
100 protects buried insulating joints and flanges, e.g. when bridging in-
sulating joints in cathodically protected pipe sections.
The insulating joint or flange is connected to the coaxial connection box
via a coaxial connecting cable, thus achieving an up to three times better
protective effect than in case of a conventional connecting cable of com-
parable length. Consequently, the coaxial connection box has the advan-
tage that the insulation strength of the insulating joint is not exceeded
even in case of long connecting cables. Moreover, this solution allows
simple inspection of the Ex isolating spark gap EXFS 100, even if it is in- Coaxial cable L
stalled underground. L = 500 ... 5000 mm s = 300 ... 2000 mm
The coaxial connection box is supplied with all necessary fixing and as-
sembly accessories, thus ensuring easy installation. Pipeline

Application example NAK SN4631

Coaxial Connection Box with EXFS 100
999 990
Coaxial connection of isolating spark gaps with a low sparkover voltage for lightning equipotential bonding according to IEC 62305.
999 990 00 00 00 00 NaN

Type NAK SN4631
Part No. 999 990
Isolating spark gap acc. to EN 62561-3 / IEC 62561-3 yes
Lightning impulse current (10/350 µs) (Iimp) 100 kA
Nominal discharge current (8/20 µs) (In) 100 kA
Rated impulse sparkover voltage (Ur imp) ≤ 1.25 kV
Degree of protection protection IP 67 (UV-resistant)

250 You will find detailed product information on our website Valid as of August 1, 2020