S-BT Threaded Fastener Specification

page84 Specifications
5.9.3 Short circuit current
Fordischargingshortcircuitcurrentwhileprotectingelectricalequipmentorearth / 
groundcabletraysandladders.
Test Standard Requirements or Test criteria
IEC60947-7-1
IEC60947-7-2
Agroundingconnectionmustbecapableofwithstanding
ahightestcurrent(I
test
)foranexposuretimeof1second.
I
test
=A
cable
[mm
2
]x120[A/mm
2
]
whereA
cable
=crosssectionalareaoftheattached
cable,exposuretime1secondi.e.forwiresize10mm²,
acurrentof1200Afor1sec
UL 467
Agroundingconnectionmustbecapableofwithstanding
ahightestcurrent(I
test
)foranexposuretimeof4seconds
(10AWG)or9seconds(4/0AWG)
Fasteners
Singlepointconnection,TypeA
S-BT-ERM10/15SN6
S-BT-ERW10/15SN6
S-BT-EFM10/15AN6
S-BT-EFW10/15AN6
S-BT-ERM8/15SN6
S-BT-EFM8/15AN6
Singlepointconnection,TypeB
S-BT-ERM10HC120
S-BT-ERW10HCAWG4/0
S-BT-EFM10HC120
S-BT-EFW10HCAWG4/0
Tested configuration Test results
Singlepointconnection,TypeA
Shortcircuit
currentl
cw
Exposuretime
t
d
Result
1.20kA(IEC)
0.75kA(UL)
1 s
4 s
pass
pass
Single point connection
withHiltistandoffadapterM10,
Type B
Shortcircuit
currentl
cw
Exposuretime
t
d
Result
1.20kA(IEC) 1 s pass
5.8.2 Short circuit current
For discharging short circuit current while protecting electrical equipment or earth / ground or bonded cable trays and ladders
Test Standards Requirements or test criteria
IEC 61000-5-2
• Tight contact between bonding strap terminal and equipment frame due to
low electrical impedance
• Durably resistant to vibration
• Durably resistant to corrosion
• Durably resistant to mechanical forces and pull out forces
• Short time current withstand ability in accordance to IEC EN 60947-7-2
Pass
IEC EN 60947-7-2
A grounding connection must be capable of withstanding a high test current
(I
test
) for an exposure time of 1 second.
I
test
= A
cable
[mm
2
] x 120 [A/mm
2
]
where A
cable
= cross sectional area of the attached cable, exposure time 1
second
i.e for wire size 10 mm
2
, a current of 1200 A for 1 sec
UL 467
A grounding connection must be capable of withstanding a high test current
(I
test
) for a specified exposure time.
Table 14.1, e.g.
• 14 AWG(2.1mm
2
) 300A for 4s
• 12 AWG(3.3mm
2
) 470A for 4s
• 10 AWG(5.3mm
2
) 750A for 4s
• 8 AWG(8.4mm
2
) 1180A for 4s
Tested Configuration Tested Fasteners Test Results
Single point connection
X-BT-ER M10/3 SN 4
X-BT-ER W10/3 SN 4
X-BT-ER M8/7 SN 4
X-BT-ER M6/7 SN 4
X-BT-ER W6/7 SN 4
Current Exposure time Result
1400 A (IEC) 1 s PASS
750 A (UL) 4 s RATED
Note: Higher currents for a longer exposure time will result in failed
connection.
Double point connection
X-BT-ER M8/7 SN 4
X-BT-ER M6/7 SN 4
X-BT-ER W6/7 SN 4
2240 A (IEC) 1 s PASS
Note: Higher currents for an exposure time of 1 s will result in failed
connection
Conclusion
Based on wire sizes as per IEC 60947-7-2 & UL 467
(irrespective of current withstand ability)
Wire size (Max.) Fastener
Connection
configuration
10 mm
2
(IEC)
10 AWG (UL)
X-BT-ER M10/3 SN 4
X-BT-ER W10/3 SN 4
X-BT-ER M8/7 SN 4
X-BT-ER M6/7 SN 4
X-BT-ER W6/7 SN 4
Single point
connection
16 mm
2
(IEC
X-BT-ER M8/7 SN 4
X-BT-ER M6/7 SN 4
X-BT-ER W6/7 SN 4
Double point
connection
Based on short term current withstand ability
(irrespective of wire size)
Current
(Max.)
Fastener
Exposure
time
Connection
configuration
1400 A
X-BT-ER M10/3 SN 4
X-BT-ER W10/3 SN 4
X-BT-ER M8/7 SN 4
X-BT-ER M6/7 SN 4
X-BT-ER W6/7 SN 4
1 s
Single point
connection
750 A 4 s
2240 A
X-BT-ER M8/7 SN 4
X-BT-ER M6/7 SN 4
X-BT-ER W6/7 SN 4
1 s
Double point
connection
or