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GRC Conduit Installation Length

Last modified by
on
Jan 28, 2025, 5:18:34 PM
Created by
on
Jul 2, 2018, 3:21:27 PM
`L = f( 1 , 2 , "t" )`
`(S)"Size of EMT Conduit"`
`(LvL)"Level of Difficulty"`
`(t)"Time allocated to installation"`

The GRC Conduit Installation Length calculator estimates the amount of length of installed Galvanized Rigid Conduit (GRC) based on the time (t) allocated to installation, the Level of Difficulty (lvl) and the size (S) of the conduit.

INSTRUCTIONS: Choose units and enter the following:

  • (S)  Choose a size of conduit. These are inches.
  • (lvl)  Choose a level of difficulty.
  •  (t)  Enter the duration of time allocated to the installation

GRC Conduit Install Length(L): The calculator returns the installed length estimate in feet.  However this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

GRC stands for Galvanized Rigid Conduit which is a rigid metallic conduit.  Rigid conduits have the thickest walls or steel raceways.  GRC can be either threaded (straight tapped) or have integral coupling.  The coating is zinc on both the inside and out.  

The relationship between length of conduit, level of difficulty, size of GRC and the time to install comes from industry standard numbers.  The following table is the basis of this calculator.

      Hours per Foot Installed
Size  Lvl1  Lvl2  Lvl3  Lvl4
1/2"    0.040 0.050 0.060 0.075
3/4"    0.050 0.062 0.075 0.094
1"      0.060 0.075 0.090 0.113
1-1/4"  0.075 0.094 0.113 0.141
1-1/2"  0.081 0.101 0.122 0.152
2"      0.103 0.129 0.155 0.194
2-1/2"  0.120 0.150 0.180 0.225
3"      0.150 0.188 0.225 0.281
3-1/2"  0.180 0.225 0.270 0.338
4"      0.210 0.263 0.315 0.394


Galvanized Rigid Conduit (GRC) Calculators

 


This equation, GRC Conduit Installation Length, is used in 2 pages
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