Product Technical Guides : US-EN Direct Fastening - Volume 1 Edition 22 | Page 92

Protective bonding circuit ( continued from previous page ) For discharging short circuit current while protecting electrical equipment or earth / ground or bonding cable trays and ladders
Double point connection
Recommended electrical connectors
Maximum short circuit current according to IEC
Notes
Type A
S-BT-ER W10 / 15 SN 6 S-BT-EF W10 / 15 AN 6
= 1.92 kA ( IEC )
Recommended maximum cross section of connected cables according to IEC 60947-7-2 and IEC 60947-7-1 : 6 AWG copper ( tested short circuit current = 1.92 kA for 1 s )
Fastening of thicker cable is acceptable , if the maximum short circuit current and the exposure time is not exceeded and the provisions on cable lug thickness are observed .
Lightning protection For high temporary current due to lightning
Single point connection
Recommended electrical connectors
Maximum lightning current
Notes
Classification N ( acc . IEC 62561-1 ): Type A
S-BT-ER W10 / 15 SN 6 S-BT-EF W10 / 15 AN 6
Classification N ( acc . IEC 62561-1 ): Type B
S-BT-ER W10 HC AWG2 S-BT-EF W10 HC AWG2 S-BT-ER W10 HC AWG4 / 0 S-BT-EF W10 HC AWG4 / 0
= 50 kA for ≤ 5 ms ( IEC 62561-1 )
When S-BT-ER / EF is used in class H applications only type B cable connections are allowed . Tightening torque of 5.90 ft-lb ( 8 Nm ) must be observed accurately for type B cable connections .
Classification H ( acc . IEC 62561-1 ): Type B
S-BT-ER W10 HC AWG2 S-BT-EF W10 HC AWG2 S-BT-ER W10 HC AWG4 / 0 S-BT-EF W10 HC AWG4 / 0
= 100 kA for ≤ 5 ms ( IEC 62561-1 )
Application requirements Base material thickness t II
≥ 6 mm tll
Base material corrosion protection layer
Thickness of base material corrosion protection layer ≤ 0.0315 " ( 0.8 mm ). For thicker coatings , please contact Hilti .
For single point connection type B , the conductivity disc must be in direct contact with non-coated base material .
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