vault backup: 2026-03-05 11:54:28

2026-03-05 11:54:28 -05:00
parent 9aef6786fc
commit 2e9b58e7fe
8 changed files with 192 additions and 9 deletions
@@ -21,3 +21,11 @@ yearly: "[[2026]]"
 ## Stairwell Wiring Method Selection

 [[wiring-method-selection]]
+
+I have had a tendency to use EMT assemblies in stairwells
+(fixtures, unit heaters, etc.)
+based on... something, probably;
+but it seems to be ill-informed.
+
+PVC assemblies should be used
+where not otherwise excluded.
@@ -0,0 +1,64 @@
+---
+id: 2026-03-05T10:26:48-05:00
+aliases: []
+title: 2026-03-05 10:26:48
+tags:
+  - authorship/original
+  - destiny/permanent
+  - status/draft
+  - type/timestamped
+dg-publish: true
+date-created: 2026-03-05T10:26:48-05:00
+daily: "[[2026-03-05]]"
+weekly: "[[2026-W10]]"
+monthly: "[[2026-03]]"
+quarterly: "[[2026-Q1]]"
+yearly: "[[2026]]"
+---
+# 2026-03-05 10:26:48
+
+## Python SQLite Voltage Drop Calculator
+
+Python script to account for voltage drop
+based on various factors given in various forms
+
+Python to handle calculation, defaults.
+SQLite to store conductor properties
+(resistance, reactance)
+
+Allowable voltage drop given by
+* percent overall
+* percent per n feet
+* volts overall
+* volts per n feet
+
+```python
+import math
+
+"""
+current
+apparent_power
+voltage
+phases
+wire_size
+parallel_runs
+wire_material
+conduit_material
+"""
+
+if (!current) {
+    current = apparent_power / voltage
+}
+
+if (phases = 3) {
+    max_resistance = voltage_drop_volts / math.sqrt(3) * current
+}
+else {
+    max_resistance = voltage_drop_volts * current * 2
+}
+
+power_factor_angle = math.acos(power_factor)
+
+effective_z = ac_resistance * math.cos(power_factor_angle)
+    + reactance * math.sin(power_factor_angle)
+```