EXFS Coaxial Connection Box

Isolating Spark Gap

Coaxial connection of the Ex isolating spark gap for protecting buried insulating joints
  • Voltage drop across the connecting cable is up to three times lower than in case of a conventional connecting cable
  • Version for lightning equipotential bonding according to IEC 62305 in hazardous areas
  • For bridging insulating joints in cathodically protected pipe sections of pipelines
  • Easy inspection and exchange of the spark gap without excavation work

Version

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

Details

The coaxial connection box with integrated Ex isolating spark gap EXFS 100 protects buried insulating joints and flanges, e.g. when bridging insulating 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 comparable length. Consequently, the coaxial connection box has the advantage that the insulation strength of the insulating joint is not exceeded even in case of long connecting cables. Moreover, this solution allows to easily inspect the Ex isolating spark gap EXFS 100, even if it is installed underground.
The coaxial connection box is supplied with all necessary fixing and assembly accessories, thus ensuring easy installation.

Models

Coaxial Connection Box with EXFS 100

Coaxial Connection Box with EXFS 100

Application example NAK SN4631
Dimension drawing NAK SN4631

Coaxial connection of isolating spark gaps with a low sparkover voltage for lightning equipotential bonding according to IEC 62305.

Specifications

Type
Part No.
EXFS coaxial connection box
Enclosure material
Dimensions
Degree of protection
Cable entry / fixing
Earthing screw (for maintenance purposes)
EXFS 100 spark gap (integrated in EXFS coaxial connection box)
Isolating spark gap acc. to EN 62561-3 / IEC 62561-3
Lightning impulse current (10/350 µs) (Iimp)
Class (lightning current carrying capability) acc. to EN / IEC 62561-3
Nominal discharge current (8/20 µs) (In)
Rated power-frequency withstand voltage (50 / 60 Hz) (UwAC)
Rated impulse sparkover voltage (Ur imp)
Power-frequency sparkover voltage (50 / 60 Hz) (Uaw)
Rated discharge current (50 / 60 Hz) (Imax)
Operating temperature range (TU)
Degree of protection protection
Connection of enclosure
General
Recommended cable (not included in delivery)
Weight
GTIN
PU
Part No.
  • NAK SN4631
  • 999 990
  •  
  • aluminium
  • 160 x 360 x 91 mm
  • IP 67 (UV-resistant)
  • 1 x M40
  • M10 x 30 (stainless steel)
  •  
  • yes
  • 100 kA
  • H
  • 100 kA
  • 250 V
  • ≤ 1.25 kV
  • ≤ 0.5  kV
  • 500 A / 0.2 sec.
  • -20 °C ... +60 °C
  • IP 67 (UV-resistant)
  • M10 threaded bushing, 2x M10x25 mm, 2x spring washer
  •  
  • N2XSY 01X35/16 6/10 kV RT
  • 5,07 kg
  • 4013364153776
  • 1 pc(s)
  • 999 990
  • Specifications (PDF)
  • More
    • Further Pictures
      Application example NAK SN4631
      open PDF
      Dimension drawing NAK SN4631
      open PDF
      Further Information
      Product Specifications (Text)

      Back

      Connection box with integrated Ex isolating spark gap EXFS 100 according to IEC 62561-3:2011 
(81/387/CDV) / EN 62561-3 for coaxial connection to insulating joints and flanges.
Ex isolating spark gap with Ex marking according to IEC / EN 60079: Gas   II 2G Ex d IIC T6
IEC / EN 61241: Dust  II 2D Ex tD A21 IP67 T 80°C
Lightning impulse current (10/350): 100 kA
Class (lightning current carrying capability) acc. to IEC 62561-3:2011 (81/387/CDV) / EN 50 164-3:  H
Nominal discharge current (8/20):	 100 kA
Rated impulse sparkover voltage:               <= 1.25 kV
Power-frequency sparkover voltage (50Hz): <= 0.5 kV
Rated power-frequency withstand voltage (50 Hz): <= 250 V
Rated discharge current (50 Hz):  500 A / 0.2 sec. (Tu <= 45°C)
Degree of protection: IP67
Connection of enclosure: screw M10x25 mm and spring washer, shield terminal

      delivery and installation.

      Brand: DEHN
      Type: NAK SN4631
      Part No.: 999 990

      or equivalent.
      Installation Instructions