ZaneMeyers/zmVault
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vault backup: 2026-05-12 17:00:33

Browse Source
This commit is contained in:
Zane Meyers
2026-05-12 17:00:33 -04:00
parent 064deed369
commit ac4c1ef230
49 changed files with 10941 additions and 7279 deletions
Download Patch File Download Diff File Expand all files Collapse all files
wiring-method-selection.md
+57 -39
View File
@@ -18,13 +18,15 @@ Scripts by others tend to beg questions of edge cases.
It's my intent that if a rule holds in _all_ cases,
even the super special one you're thinking I didn't consider,
that I specifically say so.
If I didn't say so, and your edge case is not covered,
**If I didn't say so,**
**and your edge case is not covered,**
**you should seek clarification.**
%%
## Wire Material Selection
[[pdi-estimating]] preference is to use aluminum conductors
[[pdi-estimating]] preference is to use aluminum conductors.
If [[pdi-bid-estimating|Bid]]'s proposal sells aluminum 100A and larger
use aluminum for grounds, even if the feeder schedule uses copper.[^1]
@@ -80,7 +82,7 @@ may only be used where they will be concealed from view.
May require rigid stub-ups in certain cases,
which could make EMT more cost-effective.
Consult with the Senior Construction Estimator in this case.
Consult with your [[conest#ConEst Senior Estimator|senior]] in this case.
> [!important]
> Be careful of ambiguous terminology in specifications and PDI proposals:
@@ -99,48 +101,52 @@ PVC in-slab may not be utilized for precast slabs.
Conduits may only be routed through slabs of thickness
at least 3 times the outer diameter of the conduit.
| Conduit Size | Minimum Slab Thickness (in) |
| ------------:| ---------------------------:|
| 1/2" | 3.0 |
| 3/4" | 3.5 |
| 1" | 4.0 |
| 1-1/4" | 5.0 |
| 1-1/2" | 6.0 |
| 2" | 7.5 |
| 3" | 9.0 |
| 2-1/2" | 10.5 |
| 3-1/2" | 12.0 |
| 4" | 13.5 |
| 5" | 17.0 |
| 6" | 20.0 |
| Conduit Size | Minimum Slab Thickness |
| ------------:| ----------------------:|
| 1/2" | 3.0 in |
| 3/4" | 3.5 in |
| 1" | 4.0 in |
| 1-1/4" | 5.0 in |
| 1-1/2" | 6.0 in |
| 2" | 7.5 in |
| 3" | 9.0 in |
| 2-1/2" | 10.5 in |
| 3-1/2" | 12.0 in |
| 4" | 13.5 in |
| 5" | 17.0 in |
| 6" | 20.0 in |
#### Shear Walls
[[construction-methods#Shear Walls|Shear Walls]]
Shear walls, like those around stairwells and elevator shafts,
[[construction-methods#Shear Walls|Shear walls]],
like those around stairwells and elevator shafts,
may be routed through with special permission.
#### Post-Tensioned Slabs
Raceway considerations for
[[construction-methods#Post-Tensioned Slab|post-tensioned slabs]],
[[construction-methods#Post-Tensioned Slab|post-tensioned slabs]]
(namely if PVC may be utilized, and if so, what sizes)
are contentious.
are contentious.[^2][^3][^4]
> [!cite] [[joel-jansen]] 2025-08-15, in reference to [[belle-meade-plaza|Belle Meade Plaza]] (pp.)
> No affect on takeoff. Routing in slab still possible.
[^2]: > [!cite] [[joel-jansen]] 2025-08-15, in reference to [[belle-meade-plaza|Belle Meade Plaza]] (pp.)
> No affect on takeoff. Routing in slab still possible.
> [!cite] [[joel-jansen]] 2025-08-21, in reference to [[belle-meade-plaza|Belle Meade Plaza]] (pp.)
> PT slabs do have some affect on takeoff.
> 3in conduit can not be run in an 11in PT slab.
[^3]: > [!cite] [[joel-jansen]] 2025-08-21, in reference to [[belle-meade-plaza|Belle Meade Plaza]] (pp.)
> PT slabs do have some affect on takeoff.
> 3in conduit can not be run in an 11in PT slab.
[^4]: [[2026-05-12_09-15-34#Post-Tensioned Slab Considerations]]
#### Pan Deck Slabs
[[construction-methods#Pan Deck Slab|Pan Deck Slab]]
Raceway considerations for
[[construction-methods#Pan Deck Slab|pan deck slabs]]
(namely if PVC may be utilized, and if so, what sizes)
are contentious.[^5]
> [!cite] [[joel-jansen]] 2025-08-15, in reference to [[belle-meade-plaza|Belle Meade Plaza]] (pp.)
> Do not route in slab.
[^5]: > [!cite] [[joel-jansen]] 2025-08-15, in reference to [[belle-meade-plaza|Belle Meade Plaza]] (pp.)
> Do not route in slab.
### MC Cable Overhead
@@ -165,15 +171,15 @@ may only be used where they will be concealed from view.
#### Multi-Circuit Homeruns
Different schools of thought exist
on whether to use multi-neutral MC or pipe and wire for homeruns.
on whether to use multi-neutral MC or pipe and wire for homeruns.[^6]
Which is more cost-effective
is apparently subject to transient market conditions.
Seek clarification from your senior on a job by job basis.
> [!quote] Art Baldwin (pp.)
> Multi-circuit MC is not cost-effective
> when considering the difficulty of rework.
> Use conduit, even EMT if necessary.
[^6]: > [!quote] Art Baldwin (pp.)
> Multi-circuit MC is not cost-effective
> when considering the difficulty of rework.
> Use conduit, even EMT if necessary.
### EMT Overhead
@@ -186,7 +192,10 @@ but may not be acceptable.
> These are usually only mentioned in specifications
> to say that they are unacceptable.
[[2025-10-15_09-32-00#Vanderbilt Central Neighborhood Residential College Spec Interpretation]]
Where only set-screw fittings with two screws are permitted
no change to takeoff is necessary.[^7]
[^7]: [[2025-10-15_09-32-00#Vanderbilt Central Neighborhood Residential College Spec Interpretation]]
## Standard Outdoor Wiring Methods
@@ -235,7 +244,9 @@ flowchart
C -- Yes --> NM/SER
```
#### Fire Rated Feeders
## Other Considerations
### Fire Rated Feeders
Where required see [[fire-resistive-wiring-methods-takeoff]].
@@ -245,5 +256,12 @@ in a 2-hour rated assembly.
This usually requires no change to takeoff for high-rises
since electrical riser rooms are themselves fire-rated.
* RHW-2 insulated conductors in conduit --- "Lifeline Cable"
* 2-hour rated metal clad cable --- "Vitalink"
### Liquidtight Flex
* [[nfpa-70_356_lfnc|Liquidtight Flexible Nonmetallic Conduit: Type LFNC]] --- "Carflex"[^8]
* [[nfpa-70_352_lfmc|Liquidtight Flexible Metal Conduit: Type LFMC]] --- "Sealtite"[^9]
[^8]: From Carflex®, manufactured by Carlon.
[^9]: From Anaconda Sealtite®, manufactured by ANAMET Electrical.