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Cooper B-Line, Inc Cable Tray Manual
TABLE III
TEMPERATURE RISE TESTS, CONDUIT CLAMPS
FOR BONDING RIGID CONDUIT TO CABLE TRAY
Test Test I
2
T Rigid Conduit Cable Tray Temp.
Current Time mult. Rise Condition After Test
Amperes Cycles 10
6
Size Material Class Material °C
36,000 16 344.7 4" Aluminum II Aluminum 19 No arcing or damage
20,900 60.5 441.2 4" Aluminum II Aluminum 70 No arcing or damage
12,100 178 433.3 4" Aluminum II Aluminum 74 No arcing or damage
21,000 20 146.8 4" Steel II Steel (?) Zinc melted at point where
conduit contacted with tray
3,260 900 159.5 4" Steel II Steel 63 No arcing or damage
21,000 30 220 2" Aluminum II Aluminum 21 No arcing or damage
12,100 120.5 294.2 2" Aluminum II Aluminum 59 No arcing or damage
8,000 245 261.1 2" Aluminum II Aluminum 44 No arcing or damage
21,000 14 103.8 2" Steel II Steel 62 Zinc melted at point where
conduit contacted with tray
12,000 60.5 145.4 2" Steel II Steel 22 Slight arc between
clamp and tray
3,240 600 104.9 2" Steel II Steel 49 No arcing or damage
21,000 20 146.8 1" Aluminum II Aluminum 20 No arcing or damage
12,200 60.5 150.3 1" Aluminum II Aluminum 24 No arcing or damage
12,100 14.5 35.3 1" Steel II Steel 6 No arcing or damage
8,000 63.5 67.84 1" Steel II Steel 59 No arcing or damage
1,980 44.5 2.9 1" Steel II Steel 1 No arcing or damage
200A FU
Appendix Sheet 2
Conduit
UL Listed
Conduit Clamp
(9ZN-1158)
Cable Tray
Conduit
Cable Tray
Right Angle
Beam Clamp
To
Current
Source
To
Current
Source
Conduit Clamp DetailTest Set-Up
CIRCUIT ARRANGEMENT FOR RIGID CONDUIT
TEMPERATURE RISE TESTS