vault backup: 2025-10-16 16:08:33

alternating-current.md

@@ -21,8 +21,8 @@ The frequency of the AC power grid in the United States is 60 Hz.
 ## 3-Phase Power
 
 The conductors between a voltage source and a load are called lines,
-and the voltage between any two lines is called line voltage.
+and the voltage between any two lines is called **line voltage**.
-The voltage measured between any line and neutral is called phase voltage.
+The voltage measured between any line and neutral is called **phase voltage**.
 
 * Poles vs Phases vs Wires
 
@@ -34,16 +34,24 @@ The voltage measured between any line and neutral is called phase voltage.
 > * Φ (capital phi)
 > * Ø (latin O with stroke)
 
-208Y/120V
+### Formula
-480Y/277V
 
-In a 3-phase wye connected system,
+$$
-ignoring the difference in voltage,
+P = \sqrt{3} \times V_{L} \times I_{L} \times PF
-is voltage drop calculated differently
+$$
-between a line to line load and a line to neutral load
+
+where:
+
+* $P$ is the power in watts,
+* $V_{L}​$ is the line voltage,
+* $I_{L}$ is the line current,
+* $PF$ is the power factor.
 
 ### Voltage Systems
 
+208Y/120V
+480Y/277V
+
 120/240V 1-Phase 3-Wire:
 * 120V 1-Phase 2-Wire # Line to Neutral
 * 240V 1-Phase 2-Wire # Line to Line

nfpa-70_314_boxes.md

@@ -8,9 +8,9 @@ tags:
   - status/incomplete
   - topic/electrical
   - type/media
-title: Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
+title: "Article 314: Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures"
 ---
-# Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
+# Article 314: Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
 
 ## Part I. Scope and General
 

nfpa-70_430_motors.md

@@ -8,9 +8,9 @@ tags:
   - status/incomplete
   - topic/electrical
   - type/media
-title: Article 430 Motors, Motor Circuits, and Controllers
+title: "Article 430: Motors, Motor Circuits, and Controllers"
 ---
-# Article 430 Motors, Motor Circuits, and Controllers
+# Article 430: Motors, Motor Circuits, and Controllers
 
 ## Part I. General
 

nfpa-70_450_transformers.md

@@ -8,9 +8,9 @@ tags:
   - status/incomplete
   - topic/electrical
   - type/media
-title: Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
+title: "Article 450: Transformers and Transformer Vaults (Including Secondary Ties)"
 ---
-# Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
+# Article 450: Transformers and Transformer Vaults (Including Secondary Ties)
 
 ## Part I. General Provisions
 

nfpa-70_520_theaters.md

@@ -0,0 +1,13 @@
+---
+id:
+aliases:
+  - nec-520
+tags:
+  - authorship/other
+  - destiny/uncertain
+  - status/incomplete
+  - topic/electrical
+  - type/media
+title: "Article 520: Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations"
+---
+# Article 520: Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations

switchgear.md

@@ -20,14 +20,12 @@ title: Switchgear
 > * Theatrical Switchboards
 > * Stage Switchboards
 
-Company switches are lighting control devices
-unique to performance venues
-like those subject to **NEC Article 520:
-Theaters, Audience Areas of Motion Picture and Television Studios,
-Performance Areas, and Similar Locations**
-
 ![[company-switch.png|500x625]]
 
+Company switches are lighting control equipment
+unique to performance venues
+like those subject to [[nfpa-70_520_theaters]]
+
 > [!cite] NEC Article 520.2
 > **Stage Switchboard.**
 > A permanently installed switchboard, panelboard, or rack