The Length of GRC Conduit Installed 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
- GRC Conduit Installation Time: Computes the Estimated Install Time for GRC (Galvanized Rigid Conduit) based on the GRC size, length of conduit and level of difficulty.
- GRC Conduit Installation Length: Computes the Length of GRC (Galvanized Rigid Conduit) installed based on an installation time period and level of difficulty.
- GRC Conduit Weight: Compute the weight of GRC conduit based on size and length.
- Rolling Offset: Computes the run and travel distances in a rolling offset.