Electri-Flex all products Engineering Guide
Engineering Information
Conduit Cutting
ELECTRI-FLEX VISE
The Electri-Flex cutting vise is recommended for accurate, straight cuts in the field. This lightweight cast iron
vise can either be bench-mounted or carried in the tool box. The clamping mechanism securely holds the
flexible conduit while the slots guide a hacksaw to ensure a clean, square cut. Suitable for conduit trade sizes
3/8" to 1-1/2". Works well on other tubing and materials too. Order #BLC-1, Weight 2.4 lbs.
CUTTING FLEXIBLE CONDUITS
Proper cutting methods for flexible
conduits are important to ensure a
sealed connection when assembled
with intended fittings. Furthermore,
in case of flexible conduits containing
steel, a clean, square cut is necessary
for establishing a good connection for
continuity of the ground.
Engineering Information
Conduit Wire Fill Charts
Per National Electrical Code — Chapter 9, Table 4
Internal
Diameter
(In.)
Trade
Size
3 / 8 0.384 0.116 0.036 0.046 0.061 0.494 0.192 0.060 0.077 0.102
1 / 2 0.635 0.317 0.098 0.127 0.168 0.632 0.314 0.097 0.126 0.166
3 / 4 0.824 0.533 0.165 0.213 0.282 0.830 0.541 0.168 0.216 0.287
1 1.020 0.817 0.253 0.327 0.433 1.054 0.872 0.270 0.349 0.462
1-1 / 4 1.275 1.277 0.396 0.511 0.677 1.395 1.528 0.474 0.611 0.810
1-1 / 2 1.538 1.857 0.576 0.743 0.984 1.588 1.979 0.613 0.792 1.049
2 2.040 3.269 1.013 1.308 1.733 2.033 3.245 1.006 1.298 1.720
2-1 / 2 2.500 4.909 1.522 1.964 2.602 2.493 4.879 1.512 1.952 2.586
3 3.000 7.069 2.191 2.828 3.747 3.085 7.475 2.317 2.990 3.962
3-1 / 2 3.500 9.624 2.983 3.848 5.099 3.520 9.731 3.017 3.892 5.157
4 4.000 12.566 3.895 5.026 6.660 4.020 12.692 3.935 5.077 6.727
3 / 8 0.495 0.192 0.060 0.077 0.102 0.494 0.192 0.060 0.077 0.102
1 / 2 0.630 0.312 0.097 0.125 0.165 0.632 0.314 0.097 0.126 0.166
3 / 4 0.825 0.535 0.166 0.214 0.284 0.830 0.541 0.168 0.216 0.287
1 1.043 0.854 0.265 0.342 0.453 1.054 0.872 0.270 0.349 0.462
1-1 / 4 1.383 1.501 0.465 0.600 0.796 1.395 1.528 0.474 0.611 0.810
1-1 / 2 1.603 2.017 0.625 0.807 1.069 1.588 1.979 0.613 0.792 1.049
2 2.063 3.341 1.036 1.336 1.771 2.033 3.245 1.006 1.298 1.720
Total Area
100%
(sq. In.)
Flexible Metal Conduit — BR, ABR
Flexible Nonmetallic Conduit Type A — BR, ABR Liquidtight Nonmetallic Conduit Type B — NM, NMHT, NM2
2 Wires
31%
(sq. In.)
HAND CUTTING IN FIELD
When using a handheld hacksaw, care
should be taken to make a square,
clean cut. This can be easily achieved
through the use of the cutting vise
shown on this page. For best results,
a blade having 24 to 32 teeth per inch
with no-set is recommended. For larger
sizes, apply reinforced tape around the
circumference of the conduit and cut
directly through the middle of the tape.
This will reduce the possibility of flaring
the ends while cutting.
Over 2
Wires 40%
(sq. In.)
1 Wire
53%
(sq. In.)
Internal
Diameter
(In.)
Liquidtight Flexible Metal Conduit — LT, LOR, EF, LA, CSA,
ALT, AT, ATLA, ATX, CEA, ZHLA, LAS, EMS, EMSP, ACEA
REPETITIVE PRODUCTION CUTTING
It has been our experience that in order
to achieve the best results; a band saw
having a blade with 24 to 32 teeth per
inch at a speed of 300 to 350 feet per
minute should be used. A no-set blade
will produce the cleanest cut. Conduit
should be held and supported in a safe
manner. Abrasive cut-off wheels and
chop saws are not recommended.
Total Area
100%
(sq. In.)
2 Wires
31%
(sq. In.)
Over 2
Wires 40%
(sq. In.)
1 Wire
53%
(sq. In.)
NPT Threaded Fittings — Fitting Thread (NPT) NPT Threaded Fittings — Knock Out Diameter
3 / 8 1 / 2 7 / 8
1 / 2 1 / 2 7 / 8
3 / 4 3 / 4 1-3 / 32
1 1 1-23 / 64
1-1 / 4 1-1 / 4 1-23 / 32
1-1 / 2 1-1 / 2 2
2 2 2-1 / 2
36
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