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Zane Meyers
2025-11-06 17:21:39 -05:00
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.obsidian/app.json
Vendored
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@@ -8,7 +8,7 @@
"useTab": false,
"alwaysUpdateLinks": true,
"tabSize": 2,
"vimMode": false,
"vimMode": true,
"promptDelete": false,
"focusNewTab": true,
"foldHeading": false,
.obsidian/plugins/novel-word-count/data.json
Vendored
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birds.md
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@@ -21,25 +21,49 @@ title: Birds I've Seen Around Here
## [Order _Anseriformes_](https://en.wikipedia.org/wiki/Anseriformes)
### [Family Anatidae](https://en.wikipedia.org/wiki/Anatidae)
### [Family Anatidae (ducks, geese, and swans)](https://en.wikipedia.org/wiki/Anatidae)
* [mallard (_Anas platyrhynchos_)](https://en.wikipedia.org/wiki/Mallard)
* [muscovy duck (_Cairina moschata_)](https://en.wikipedia.org/wiki/Muscovy_duck)
## [Order Charadriiformes](https://en.wikipedia.org/wiki/Charadriiformes)
### [Family Laridae (gulls)](https://en.wikipedia.org/wiki/Laridae)
* [ring-billed gull (_Larus delawarensis_)](https://en.wikipedia.org/wiki/Ring-billed_gull)
## [Order Passeriformes ("perching birds")](https://en.wikipedia.org/wiki/Passeriformes)
> [!info]
> * from the Latin for "sparrow shaped".
> * includes over half of all bird species.
* [blue jay (Corvidae _Cyanocitta cristata_)](https://en.wikipedia.org/wiki/Blue_jay)
* [American crow (Corvidae _Corvus brachyrhynchos_)](https://en.wikipedia.org/wiki/American_crow)
## [Order Pelecaniformes](https://en.wikipedia.org/wiki/Pelecaniformes)
### [Family Ardeidae](https://en.wikipedia.org/wiki/Ardeidae)
### [Family Ardeidae (herons)](https://en.wikipedia.org/wiki/Ardeidae)
#### [Subfamily Ardeinae](https://en.wikipedia.org/wiki/Ardeinae)
##### [Genus _Ardea_](https://en.wikipedia.org/wiki/Ardea_\(bird\))
##### [Genus _Ardea_](https://en.wikipedia.org/wiki/Ardea_(bird))
* [great egret/great white heron (_A. alba_)](https://en.wikipedia.org/wiki/Great_egret)
* [great blue heron (_A. herodias)](https://en.wikipedia.org/wiki/Great_blue_heron)
##### [Genus _Egretta_](https://en.wikipedia.org/wiki/Egretta)
> [!info]
> "Egret" is a common name that just means "small heron",
>
> * _Aigron_ -> "Heron"
> * _Aigrette_ -> "Egret"
>
> which itself just means "screecher".
* [tricolored heron (_E. tricolor_)](https://en.wikipedia.org/wiki/Tricolored_heron)
* [little blue heron (_E. caerulea_)](https://en.wikipedia.org/wiki/Little_blue_heron)
* [snowy egret (_E. thula)](https://en.wikipedia.org/wiki/Snowy_egret)
@@ -48,7 +72,7 @@ title: Birds I've Seen Around Here
* [green heron (_Butorides virescens_)](https://en.wikipedia.org/wiki/Green_heron)
### [Family Threskiornithidae](https://en.wikipedia.org/wiki/Threskiornithidae)
### [Family Threskiornithidae (Ibises and Spoonbills)](https://en.wikipedia.org/wiki/Threskiornithidae)
* [American white ibis (_Eudocimus albus_)](https://en.wikipedia.org/wiki/American_white_ibis)
* [glossy ibis (_Plegadis falcinellus_)](https://en.wikipedia.org/wiki/Glossy_ibis)
@@ -56,10 +80,9 @@ title: Birds I've Seen Around Here
## Other Orders
* [ring-billed gull (Charadriiformes Laridae _Larus delawarensis_)](https://en.wikipedia.org/wiki/Ring-billed_gull)
* [wood stork (Ciconiiformes Ciconiidae _Mycteria americana_)](https://en.wikipedia.org/wiki/Wood_stork)
* [common gallinule (Gruiformes Rallidae _Gallinula galeata_)](https://en.wikipedia.org/wiki/Common_gallinule)
* [anhinga (Suliformes Anhingidae _Anhinga anhinga_)](https://en.wikipedia.org/wiki/Anhinga)
construction-methods.md
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@@ -11,6 +11,22 @@ title: Construction Methods
---
# Construction Methods
%%
TYPICAL EIFS ON
CFMF ASSEMBLY
* EIFS -- EXTERIOR INSULATION FINISHING SYSTEM
* CFMF -- COLD-FORMED METAL FRAMING
* GWB, GYP BD -- GYPSUM WALLBOARD
FCP -- FIBER CEMENT PANEL
FCS -- FIBER CEMENT SIDING (LAP)
RI -- RIGID INSULATION
%%
## Shear Walls
Shear walls span the height of a building.
fixture-designations.md
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@@ -33,26 +33,26 @@ Use empty designations to separate phases.
>
> ```
> *** Hotel Units ***
> HU - Surface (MC) LV 20ft
> HU - Surface - 1.5hrs (MC) LV 20ft
> HU - Surface: Pendant - 2.0hrs (MC) LV 20ft
> HU - Surface: J-Box For Future Fixture (MC) LV 20ft
> HU - Recessed (MC) LV 20ft
> HU - Surface = 1.0hrs - #12 MC+LV 20ft
> HU - Surface = 1.5hrs - #12 MC+LV 20ft
> HU - Surface: Pendant = 2.0hrs - #12 MC+LV 20ft
> HU - Surface: J-Box For Future Fixture = 1.0hrs - #12 MC+LV 20ft
> HU - Recessed = 1.0hrs - #12 MC+LV 20ft
> *** Condo Units ***
> CU - Surface: Tape - 1.0hrs (MC) LV 25ft
> CU - Surface: Wall (MC) LV 25ft
> CU - Surface: Tape = 1.0hrs - #12 MC+LV 25ft
> CU - Surface: Wall = 1.0hrs - #12 MC+LV 25ft
> ```
## Fixture Labor
| Fixture Type | Labor |
| ------------ | ------------ |
| Paddle Fan | 1.5 hrs/ea |
| Pendant | 1-4 hrs/ea |
| Strip/Cove | 0.083 hrs/ft |
| Site Poles | 1.5 hrs/ea |
| Festoon | 2 hrs/ea |
| All Others | 1 hrs/ea |
| Fixture Type | Labor |
|:------------ | -----------:|
| Paddle Fan | 1.5 hr/ea. |
| Pendant | 1-4 hr/ea. |
| Strip/Cove | 0.5 hr/6ft |
| Site Poles | 1.5 hr/ea. |
| Festoon | 2.0 hr/ea. |
| All Others | 1.0 hr/ea. |
## Fixture Branch Length
@@ -67,16 +67,22 @@ Use empty designations to separate phases.
| Exterior Amenity | 50ft |
| Units | 20ft |
| Undercabinet Fixtures | 10ft |
| Stairwells | ? |
| Kitchen | ? |
Reduce as appropriate.
## Fixture Branch Wire size
| Case | Wire Size |
| -------------- | --------- |
| Site/Courtyard | #10[^1] |
| Site/Courtyard | #10 |
| Garage | #10 |
| NM Cable | #14[^2] |
| NM Cable | #14[^1] |
| All Others | #12 |
[^1]: Minimum #12 in kitchens and bathrooms.
## Garage
### Fixtures
@@ -99,7 +105,7 @@ If PVC is required, use following assemblies:
Use 1 Homerun for every 3 circuits in Garage
Use assembly `Common Assemblies`/`Device Homeruns in Slab/Deck`
Use assembly `COMMON ASSEMBLIES`/`Device Homeruns in Slab/Deck`
## Surface Mount
@@ -140,15 +146,20 @@ and change `Fct 1` to match the calculated labor
Separate these fixtures by labor, not length
```
A - Surface: Tape - 0.5hr (01-06ft) - MC #12 40ft
A - Surface: Tape - 1.0hr (07-12ft) - MC #12 40ft
A - Surface: Tape - 1.5hr (13-18ft) - MC #12 40ft
A - Surface: Tape - 2.0hr (19-24ft) - MC #12 40ft
A - Surface: Tape - 2.5hr (25-30ft) - MC #12 40ft
A - Surface: Tape - 3.0hr (31-36ft) - MC #12 40ft
A - Surface: Tape - 3.5hr (37-42ft) - MC #12 40ft
A - Surface: Tape - 4.0hr (43-48ft) - MC #12 40ft
A - Surface: Tape - 4.5hr (49-54ft) - MC #12 40ft
*** Back of House ***
B - Surface: Tape = 0.5hr (01-06ft) - MC #12 40ft
B - Surface: Tape = 1.0hr (07-12ft) - MC #12 40ft
_
*** Interior Amenity ***
IA - Surface: Tape = 0.5hr (01-06ft) - MC+LV #12 40ft
IA - Surface: Tape = 1.0hr (07-12ft) - MC+LV #12 40ft
IA - Surface: Tape = 1.5hr (13-18ft) - MC+LV #12 40ft
IA - Surface: Tape = 2.0hr (19-24ft) - MC+LV #12 40ft
IA - Surface: Tape = 2.5hr (25-30ft) - MC+LV #12 40ft
IA - Surface: Tape = 3.0hr (31-36ft) - MC+LV #12 40ft
IA - Surface: Tape = 3.5hr (37-42ft) - MC+LV #12 40ft
IA - Surface: Tape = 4.0hr (43-48ft) - MC+LV #12 40ft
IA - Surface: Tape = 4.5hr (49-54ft) - MC+LV #12 40ft
```
## Recessed
@@ -247,13 +258,13 @@ Add subassemblies for stub-outs, pole, base, and grounding as appropriate.
| Fixture Type | Path (`FIXTURE ACCESSORIES`/`COURTYARDS & LANDSCAPE`/...) |
| ------------------------------------ | ------------------------------------------------------------------ |
| Step Light | .../`STEP FIX, 3/4" CONDUIT - PVC40 - ...` |
| Bollard | .../`BOLLARD, 3/4" CONDUIT - PVC40 - ...`[^1] |
| Bollard | .../`BOLLARD, 3/4" CONDUIT - PVC40 - ...`[^2] |
| Up-light | .../`PERMA POST, 3/4" CONDUIT - PVC40 - ...` |
| In-grade up-light | .../`3/4" CONDUIT - PVC40, IMC Elbow, ...` |
| Fixtures built into cabanas/pergolas | .../`ALUM BOX W/ FLEX FIX, 3/4" CONDUIT - PVC40 - ...` |
| Handrail light | .../`ALUM BOX W/ FLEX FIX, 3/4" CONDUIT - PVC40, IMC ELBOW - ...` |
[^1]: If we don't own concrete, delete Pre-cast bollard base from assembly
[^2]: If we don't own concrete, delete Pre-cast bollard base from assembly
## FAA Lighting
lighting-controls.md
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SIMpull® 16/2 Low Voltage Signal Cable, Blue
```
This method is compliant with NEC 725.136(I)(1),
This method is compliant with
[[nfpa-70_725_control-circuits#725.136(I) Other Applications.|NEC 725.136(I)(1)]],
which allows control circuits to share a raceway with power conductors
if either all of the power conductors or all of the control conductors
are themselves in a raceway,
or in metal-sheathed, metal-clad, non–metallic-sheathed, or Type UF cable.
### Triac Dimming
Triac dimmers work by chopping the AC power waveform.
This reduces the output power, so the lamp dims.
> [!info]
> "Triac" refers to the electronic component
> that does the wave-chopping.
There are two subtypes based on which side of the wave is chopped.
* Magnetic Low Voltage (MLV)** -- AKA "Leading Edge" or "Forward Phase"
* Electronic Low Voltage (ELV)** -- AKA "Trailing Edge" or "Reverse Phase"
> [!important]
> The "magnetic" and "electronic" of MLV and ELV
> are holdovers from pre-LED days.
> They have nothing to do with how they are used today.
> They are, unfortunately, the most common terms.
> [!important]
> "Triac" is sometimes used in contrast to ELV erroneously to mean MLV
There also exist "universal" dimmers,
which can be switched between the two subtypes.
nfpa-70_110_requirements-for-electrical-installations.md
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@@ -141,24 +141,29 @@ can be found in Section 8.11 of NFPA 70B-2019, Recommended Practice for Electric
### 110.26 Spaces About Electrical Equipment.
Access and working space shall be provided and maintained about all electrical equipment to permit ready and safe operation and
maintenance of such equipment.
Access and working space shall be provided and maintained about all electrical equipment
to permit ready and safe operation and maintenance of such equipment.
#### 110.26(A) Working Space.
Working space for equipment operating at 1000 volts, nominal, or less to ground and likely to require examination, adjustment,
servicing, or maintenance while energized shall comply with the dimensions of 110.26(A)(1), (A)(2), (A)(3), and (A)(4) or as required or
permitted elsewhere in this Code.
Working space for equipment operating at 1000 volts, nominal, or less to ground
and likely to require examination, adjustment, servicing, or maintenance while energized
shall comply with the dimensions of 110.26(A)(1), (A)(2), (A)(3), and (A)(4)
or as required or permitted elsewhere in this Code.
Informational Note: NFPA 70E-2018, Standard for Electrical Safety in the Workplace, provides guidance, such as determining severity
of potential exposure, planning safe work practices including establishing an electrically safe work condition, arc flash labeling, and
selecting personal protective equipment.
Informational Note:
NFPA 70E-2018, Standard for Electrical Safety in the Workplace,
provides guidance, such as determining severity of potential exposure,
planning safe work practices including establishing an electrically safe work condition,
arc flash labeling, and selecting personal protective equipment.
### 110.26(A)(1) Depth of Working Space.
The depth of the working space in the direction of live parts shall not be less than that specified in Table 110.26(A)(1) unless the
requirements of 110.26(A)(1)(a), (A)(1)(b), or (A)(1)(c) are met. Distances shall be measured from the exposed live parts or from the
enclosure or opening if the live parts are enclosed.
The depth of the working space in the direction of live parts
shall not be less than that specified in Table 110.26(A)(1) unless the
requirements of 110.26(A)(1)(a), (A)(1)(b), or (A)(1)(c) are met.
Distances shall be measured from the exposed live parts
or from the enclosure or opening if the live parts are enclosed.
### Table 110.26(A)(1) Working Spaces
@@ -183,49 +188,76 @@ Note: Where the conditions are as follows:
* Condition 3 -- Exposed live parts on both sides of the working space.
(a) _Dead-Front Assemblies._ Working space shall not be required in the back or sides of assemblies, such as dead-front switchboards, switchgear, or motor control centers, where all connections and all renewable or adjustable parts, such as fuses or switches, are accessible from locations other than the back or sides. Where rear access is required to work on nonelectrical parts on the back of enclosed equipment, a minimum horizontal working space of 762 mm (30 in.) shall be provided.
(a) _Dead-Front Assemblies._
Working space shall not be required in the back or sides of assemblies, such as dead-front switchboards, switchgear, or motor control centers, where all connections and all renewable or adjustable parts, such as fuses or switches, are accessible from locations other than the back or sides. Where rear access is required to work on nonelectrical parts on the back of enclosed equipment, a minimum horizontal working space of 762 mm (30 in.) shall be provided.
(b) _Low Voltage._ By special permission, smaller working spaces shall be permitted where all exposed live parts operate at not greater than 30 volts rms, 42 volts peak, or 60 volts dc.
(b) _Low Voltage._
By special permission, smaller working spaces shall be permitted where all exposed live parts operate at not greater than 30 volts rms, 42 volts peak, or 60 volts dc.
<!-- TODO: TEXT OMITTED -->
#### 110.26(C)(3) Personnel Doors.
Where equipment rated 800 amperes or more that contains overcurrent devices, switching devices, or control devices is installed and there is a personnel door(s) intended for entrance to and egress from the working space less than 7.6 m (25 ft) from the nearest edge of the working space, the door(s) shall open in the direction of egress and be equipped with listed panic hardware or listed fire exit hardware.
Where equipment rated 800 amperes or more that contains overcurrent devices,
switching devices, or control devices is installed
and there is a personnel door(s) intended for entrance to and egress from the working space
less than 7.6 m (25 ft) from the nearest edge of the working space,
the door(s) shall open in the direction of egress
and be equipped with listed panic hardware or listed fire exit hardware.
Informational Note: For information on panic hardware, see UL 305, Standard For Safety For Panic Hardware. For fire exit hardware, see UL 305, Standard For Panic Hardware, and UL 10C, Standard for Safety for Positive Pressure Fire Tests of Door Assemblies.
Informational Note:
For information on panic hardware, see UL 305, Standard For Safety For Panic Hardware.
For fire exit hardware, see UL 305, Standard For Panic Hardware,
and UL 10C, Standard for Safety for Positive Pressure Fire Tests of Door Assemblies.
#### 110.26(D) Illumination.
Illumination shall be provided for all working spaces about service equipment, switchboards, switchgear, panelboards, or motor control centers installed indoors. Control by automatic means shall not be permitted to control all illumination within the working space. Additional lighting outlets shall not be required where the work space is illuminated by an adjacent light source or as permitted by 210.70(A)(1), Exception No. 1, for switched receptacles.
Illumination shall be provided for all working spaces about service equipment,
switchboards, switchgear, panelboards, or motor control centers installed indoors.
Control by automatic means shall not be permitted
to control all illumination within the working space.
Additional lighting outlets shall not be required
where the work space is illuminated by an adjacent light source
or as permitted by 210.70(A)(1), Exception No. 1, for switched receptacles.
#### 110.26(E) Dedicated Equipment Space.
All switchboards, switchgear, panelboards, and motor control centers
shall be located in dedicated spaces and protected from damage.
Exception:
Control equipment that
by its very nature or because of other rules of the Code
must be adjacent to or within sight of its operating machinery
shall be permitted in those locations.
> [!important] Exception
> Control equipment that by its very nature
> or because of other rules of the Code
> must be adjacent to or within sight of its operating machinery
> shall be permitted in those locations.
#### 110.26(E)(1) Indoor.
Indoor installations shall comply with 110.26(E)(1)(a) through (E)(1)(d).
* (a) _Dedicated Electrical Space._ The space equal to the width and depth of the equipment and extending from the floor to a height of 1.8 m (6 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. No piping, ducts, leak protection apparatus, or other equipment foreign to the electrical installation shall be located in this zone.
* (a) _Dedicated Electrical Space._
The space equal to the width and depth of the equipment
and extending from the floor to a height of 1.8 m (6 ft) above the equipment
or to the structural ceiling, whichever is lower,
shall be dedicated to the electrical installation.
No piping, ducts, leak protection apparatus,
or other equipment foreign to the electrical installation
shall be located in this zone.
Exception: Suspended ceilings with removable panels shall be permitted within the 1.8 m (6-ft) zone.
> [!important] Exception
> Suspended ceilings with removable panels shall be permitted within the 1.8 m (6-ft) zone.
* (b) _Foreign Systems._ The area above the dedicated space required by 110.26(E)(1)(a) shall be permitted to contain foreign
systems, provided protection is installed to avoid damage to the electrical equipment from condensation, leaks, or breaks in
such foreign systems.
* (b) _Foreign Systems._
The area above the dedicated space required by 110.26(E)(1)(a)
shall be permitted to contain foreign systems,
provided protection is installed to avoid damage to the electrical equipment
from condensation, leaks, or breaks in such foreign systems.
* (c) _Sprinkler Protection._ Sprinkler protection shall be permitted for the dedicated space where the piping complies with this section.
* (c) _Sprinkler Protection._
Sprinkler protection shall be permitted for the dedicated space where the piping complies with this section.
* (d) _Suspended Ceilings._ A dropped, suspended, or similar ceiling that does not add strength to the building structure shall not be
considered a structural ceiling.
* (d) _Suspended Ceilings._
A dropped, suspended, or similar ceiling that does not add strength to the building structure shall not be considered a structural ceiling.
#### 110.26(E)(2) Outdoor.
nfpa-70_725_control-circuits.md
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@@ -0,0 +1,175 @@
---
id:
aliases:
- nec-725
tags:
- authorship/other
- destiny/uncertain
- exclude-from-word-count
- status/incomplete
- topic/construction/electrical
- type/media
title: "NEC Article 725: Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits"
---
# NEC Article 725: Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
## Part I. General
### 725.1 Scope.
This article covers remote-control, signaling, and power-limited circuits that are not an integral part of a device or of utilization equipment.
Informational Note:
The circuits described herein are characterized by usage and electrical power limitations that differentiate them from electric light and power circuits; therefore, alternative requirements to those of Chapters 1 through 4 are given with regard to minimum wire sizes, ampacity adjustment and correction factors, overcurrent protection, insulation requirements, and wiring methods and
materials.
### 725.2 Definitions.
The definitions in this section shall apply only within this article.
## Part III. Class 2 and Class 3 Circuits
### 725.136 Separation from Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm Circuit
Conductors, and Medium-Power Network-Powered Broadband Communications Cables.
#### 725.136(A) General.
Cables and conductors of Class 2 and Class 3 circuits shall not be placed in any cable, cable tray, compartment, enclosure, manhole, outlet box, device box, raceway, or similar fitting with conductors of electric light, power, Class 1, non–power-limited fire alarm circuits, and medium-power network-powered broadband communications circuits unless permitted by 725.136(B) through (I).
#### 725.136(B) Separated by Barriers.
Class 2 and Class 3 circuits shall be permitted to be installed together with the conductors of electric light, power, Class 1, non–power-limited fire alarm and medium power network-powered broadband communications circuits where they are separated by a barrier.
#### 725.136(C) Raceways Within Enclosures.
In enclosures, Class 2 and Class 3 circuits shall be permitted to be installed in a raceway to separate them from Class 1, non–power-limited fire alarm and medium-power network-powered broadband communications circuits.
#### 725.136(D) Associated Systems Within Enclosures.
Class 2 and Class 3 circuit conductors in compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be instal led with electric light, power, Class 1, non–power-limited fire alarm, and medium-power network-powered broadband communications circuits where they are introduced solely to connect the equipment connected to Class 2 and Class 3 circuits, and where (1) or (2) applies:
1. The electric light, power, Class 1, non–power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors are routed to maintain a minimum of 6 mm (0.25 in.) separation from the conductors and cables of Class 2 and Class 3 circuits.
2. The circuit conductors operate at 150 volts or less to ground and also comply with one of the following:
* a. The Class 2 and Class 3 circuits are installed using Type CL3, CL3R, or CL3P or permitted substitute cables, provided these Class 3 cable conductors extending beyond the jacket are separated by a minimum of 6 mm (0.25 in.) or by a nonconductive sleeve or nonconductive barrier from all other conductors.
* b. The Class 2 and Class 3 circuit conductors are installed as a Class 1 circuit in accordance with 725.41.
#### 725.136(E) Enclosures with Single Opening.
Class 2 and Class 3 circuit conductors entering compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be instal led with Class 1, non–power-limited fire alarm and medium-power network-powered broadband communications circuits where they are introduced solely to connect the equipment connected to Class 2 and Class 3 circuits. Where Class 2 and Class 3 circuit conductors must enter an enclosure that is provided with a single opening, they shall be permitted to enter through a single fitting (such as a tee), provided the conductors are separated from the conductors of the other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing.
#### 725.136(F) Manholes.
Underground Class 2 and Class 3 circuit conductors in a manhole shall be permitted to be installed with Class 1, non–power-limited fire
alarm and medium-power network-powered broadband communications circuits where one of the following conditions is met:
1. The electric light, power, Class 1, non–power-limited fire alarm and medium-power network-powered broadband communications circuit conductors are in a metal-enclosed cable or Type UF cable.
2. The Class 2 and Class 3 circuit conductors are permanently and effectively separated from the conductors of other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing, in addition to the insulation or covering on the wire.
3. The Class 2 and Class 3 circuit conductors are permanently and effectively separated from conductors of the other circuits and securely fastened to racks, insulators, or other approved supports.
#### 725.136(G) Cable Trays.
Class 2 and Class 3 circuit conductors shall be permitted to be installed in cable trays, where the conductors of the electric light, Class 1, and non–power-limited fire alarm circuits are separated by a solid fixed barrier of a material compatible with the cable tray or where the Class 2 or Class 3 circuits are installed in Type MC cable.
#### 725.136(H) In Hoistways.
In hoistways, Class 2 or Class 3 circuit conductors shall be installed in rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible nonmetallic conduit, or electrical metallic tubing. For elevators or similar equipment, these conductors shall be permitted to be installed as provided in 620.21.
#### 725.136(I) Other Applications.
For other applications,
conductors of Class 2 and Class 3 circuits
shall be separated by at least 50 mm (2 in.)
from conductors of any electric light, power,
Class 1 non–power-limited fire alarm
or medium power network-powered broadband communications circuits
unless one of the following conditions is met:
1. Either all of the electric light, power,
Class 1, non–power-limited fire alarm
and medium-power network-powered broadband communications circuit conductors
or all of the Class 2 and Class 3 circuit conductors
are in a raceway or in metal-sheathed, metal-clad,
non–metallic-sheathed, Type TC, or Type UF cables
2. All of the electric light, power,
Class 1 non–power-limited fire alarm,
and medium-power network-powered broadband communications circuit conductors
are permanently separated from all of the Class 2 and Class 3 circuit conductors
by a continuous and firmly fixed nonconductor,
such as porcelain tubes or flexible tubing,
in addition to the insulation on the conductors
### 725.139 Installation of Conductors of Different Circuits in the Same Cable, Enclosure, Cable Tray,
Raceway, or Cable Routing Assembly.
#### 725.139(A) Two or More Class 2 Circuits.
Conductors of two or more Class 2 circuits shall be permitted within the same cable, enclosure, raceway, or cable routing assembly.
#### 725.139(B) Two or More Class 3 Circuits.
Conductors of two or more Class 3 circuits shall be permitted within the same cable, enclosure, raceway, or cable routing assembly.
#### 725.139(C) Class 2 Circuits with Class 3 Circuits.
Conductors of one or more Class 2 circuits shall be permitted within the same cable, enclosure, raceway, or cable routing assembly with conductors of Class 3 circuits, provided that the insulation of the Class 2 circuit conductors in the cable, enclosure, raceway, or cable routing assembly is at least that required for Class 3 circuits.
#### 725.139(D) Class 2 and Class 3 Circuits with Communications Circuits.
##### 725.139(D)(1) Communications Cables.
Conductors of one or more Class 2 or Class 3 circuits shall be permitted in the same cable with conductors of communications circuits provided the cable is a listed communications cable that shall be installed in accordance with the requirements of Part V of Article 805.
The cables shall be listed as communications cables.
##### 725.139(D)(2) Composite Cables.
Cables constructed of individually listed Class 2, Class 3, and communications cables under a common jacket shall be permitted to be classified as communications cables. The fire resistance rating of the composite cable shall be determined by the performance of the composite cable.
#### 725.139(E) Class 2 or Class 3 Cables with Other Circuit Cables.
Jacketed cables of Class 2 or Class 3 circuits
shall be permitted in the same enclosure,
cable tray, raceway, or cable routing assembly
with jacketed cables of any of the following:
1. Power-limited fire alarm systems
in compliance with Parts I and III of Article 760
2. Nonconductive and conductive optical fiber cables
in compliance with Parts I and IV of Article 770
3. Communications circuits
in compliance with Parts I and IV of Article 805
4. Community antenna television and radio distribution systems
in compliance with Parts I and IV of Article 820
5. Low-power, network-powered broadband communications
in compliance with Parts I and IV of Article 830
#### 725.139(F) Class 2 or Class 3 Conductors or Cables and Audio System Circuits.
Audio system circuits described in 640.9(C), and installed using Class 2 or Class 3 wiring methods in compliance with 725.133 and 725.154, shall not be permitted to be installed in the same cable, raceway, or cable routing assembly with Class 2 or Class 3 conductors or cables.
### 725.141 Installation of Circuit Conductors Extending Beyond One Building.
Where Class 2 or Class 3 circuit conductors extend beyond one building and are run so as to be subject to accidental contact with electric light or power conductors operating over 300 volts to ground, or are exposed to lightning on interbuilding circuits on the same premises, the requirements of the following shall also apply:
1. Sections 800.44, 800.53, 800.100, 805.50,
805.93, 805.170(A), and 805.170(B)
for other than coaxial conductors
2. Sections 820.44, 820.93, and 820.100
for coaxial conductors
### 725.143 Support of Conductors.
Class 2 or Class 3 circuit conductors shall not be strapped, taped, or attached by any means to the exterior of any conduit or other raceway as a means of support. These conductors shall be permitted to be installed as permitted by 300.11(C)(2).
nfpa-70_national-electric-code.md
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@@ -179,7 +179,7 @@ title: "NFPA 70: National Electric Code"
* [[nfpa-70_710|710 Stand-Alone Systems]]
* [[nfpa-70_712|712 Direct Current Microgrids]]
* [[nfpa-70_720|720 Circuits and Equipment Operating at Less Than 50 Volts]]
* [[nfpa-70_725|725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits]]
* [[nfpa-70_725_control-circuits|725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits]]
* [[nfpa-70_727|727 Instrumentation Tray Cable: Type ITC]]
* [[nfpa-70_728|728 Fire-Resistive Cable Systems]]
* [[nfpa-70_750|750 Energy Management Systems]]
regular-expressions.md
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---
id:
aliases: []
tags: []
title: Regular Expressions
---
# Regular Expressions
[Regular expression](https://en.wikipedia.org/wiki/Regular_expression)