Protective Conductor Connection at the ATEX Enclosure

The external protective conductor connection is located outside the enclosure of the DetCon detonation controller.

58_DetCon_externer Erdungsanschluss

 

Use in potentially explosive atmospheres!

The external protective conductor has to be connected always. Observe the requirements of EN 60439-1:1999 + A1:2004 section 7.4.3.1.

 

  1. Connect the external protective conductor to the corresponding connection as shown in the following illustration.

58a_DetCon_äußerer Schutzleiteranschluss-de

Pos.

Description

1

Blind rivet nut for M8

2

Enclosure

3

Washer ISO 7092-8.4

4

External protective conductor, the minimum cross section is 4 mm2,
EN 60079-0:2012 + A11:2013 section 15.3 has to be observed!

5

Ring cable lugs DIN 46234, nominal cross section > 2.5 mm2 to35 mm2
Pipe cable lugs DIN 46235, nominal cross section 10 mm2 to 35 mm2

6

Split washer DIN 127-B8

7

Hexagon nut ISO 4017 – M8 x 20 mm (0.79")

 

Protective conductor connection of the ATEX enclosure

All protective conductor connections of the ATEX enclosure are designed in M8.

Connection of external protective conductor

The external protective conductor is connected with the supplied stainless steel screws, nuts, washers and lock washers. The external protective conductor has to be provided with a standard cable lug with a suitable cross-section and ring diameter. The selected cable lugs have to correspond to one of the following standards:

  • DIN 46234 for ring cable lugs
  • DIN 46235 for pipe cable lugs

 

The cross-section for the protective conductor has to be dimensioned as follows:

Cross-section phase conductor S

Minimum cross-section of corresponding protective conductor Sp

S £ 16 mm2

S

16 mm2 < S £ 35 mm2

16 mm2

S > 35 mm2

0.5 mm2 x S

 

Observe the requirements of EN 60439-1:1999 + A1:2004

  • The protective conductor connection parts are designed for a minimum cross-section of 4 mm2.
  • When installing the external protective conductor connection, it has to be ensured that the conductors are secured against twisting and loosening. This is achieved by professional and fixed installation of the protective conductors close to the enclosure body.
  • Applying a tightening torque of 10 Nm (7.38 lb-ft) to the screw joint ensures sufficient contact pressure in conjunction with the supplied split washer.
  • The material selection for the protective conductor connection is such that electrochemical corrosion is not to be expected. Protective conductors have to be protected in a suitable way against mechanical, electrodynamic and thermodynamic influences and forces.
  • Mechanical connections of protective conductors have to be accessible for inspection and testing.