diff --git a/conductor-sizing.md b/conductor-sizing.md index 7d4a920..323b5a8 100644 --- a/conductor-sizing.md +++ b/conductor-sizing.md @@ -119,101 +119,7 @@ either for spec requirements or conduit fill considerations. ## Voltage Drop -> [!info] Ohm's Law -> -> $$ -> V = I \times R, \quad R = \frac{V}{I}, \quad I = \frac{V}{R} -> $$ - -### Step 1: Effective Impedance $Z$ - -$$ -Z = R \cos(\theta) + X \sin(\theta) -$$ - -where -* $Z$ = Effective impedance -* $R$ = AC resistance -* $X$ = Reactance -* $\theta$ = Power factor angle = $\arccos(PF)$ - -#### Parallel Runs - -The equivalent resistance of parallel resistances is given by - -$$ -\frac{1}{R_{\text{eq}}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \dots + \frac{1}{R_n} -$$ - -For $n$ parallel resistances of value $R$ - -$$ -\begin{align*} -\frac{1}{R_{\text{eq}}} &= n \times \left(\frac{1}{R}\right) \\ -&= \frac{n}{R} \\ -R_{\text{eq}} &= \frac{R}{n} -\end{align*} -$$ - -### Step 2: Voltage Drop - -> [!important] -> This section assumes a 3-phase -> 208Y/120V or 480Y/277V voltage system - -> [!info] 3-Phase Voltage -> -> $$ -> V_{L} = \sqrt{3} \times V_{P}, \quad V_{P} = \frac{V_{L}}{\sqrt{3}} -> $$ - -3% allowable voltage drop for a 120V line-to-neutral load: - -$$ -\text{Max} \Delta V = 0.03 \times 120 \text{V}_{P} = 3.6 \text{V}_{P} -$$ - -3% allowable voltage drop for a 208V line-to-line load: - -$$ -\text{Max} \Delta V = 0.03 \times 208 \text{V}_{L} = 6.24 \text{V}_{L} -$$ - -#### Line to Neutral Loads - -$$ -\Delta V_{P} = I \times Z \times 2L -$$ - -#### Line to Line Loads - -$$ -\Delta V_{L} = \sqrt{3} \times \left( I \times Z \times 2L \right) -$$ - -#### 3-Phase Loads - -$$ -\Delta V_{3\phi} = \sqrt{3} \times \left( I \times Z \times L \right) -$$ - -where -* $\Delta V$ = Voltage drop in volts ($V$) -* $I$ = Current in amperes ($A$) -* $L$ = Length of wire one way in feet ($\text{ft}$) - -> [!important] -> "Current" is not the OCPD rating, -> but the actual load. - -*** - -It is often more useful to know the maximum length -a certain wiring configuration is suitable for. - -$$ -L = \frac{ \Delta V }{ I \times M } \times \frac{1}{Z} -$$ +[[voltage-drop]] ## Transformers diff --git a/individual-ability.md b/individual-ability.md new file mode 100644 index 0000000..f713310 --- /dev/null +++ b/individual-ability.md @@ -0,0 +1,33 @@ +--- +id: +aliases: [] +tags: + - authorship/original + - destiny/permanent + - topic/organization +title: Individual Ability +--- +# Individual Ability + +**Effort is the smallest part of improvement.** + +This note is about practical ability. +For discussion of how others _perceive_ ability, +see [[professionalism]]. + +Individuals differ in **learning rate** and **capacity for familiarity**. +Whether nature or nurture is to blame, +there is little an adult can do to move those needles. +Making the most of the resources you have +requires developing effective coping mechanisms +(like [[notetaking]]). + +To gain and maintain skill is time consuming. +The barrier to greater professional skill +for most people is **responsibility**. + +## Capacity for Familiarity + +There is a practical limit to the mind's "shelf space". +It's not only a question of experience or exposure, +familiarity requires maintenance. diff --git a/notetaking.md b/notetaking.md new file mode 100644 index 0000000..39142b8 --- /dev/null +++ b/notetaking.md @@ -0,0 +1,21 @@ +--- +id: +aliases: [] +tags: + - authorship/original + - destiny/permanent + - topic/organization +title: Notetaking +--- +# Notetaking + +## `TALK` + +This note is intended for + +* why one should want to take notes, +* what good notes should do + +There are bad media for notetaking + +* print diff --git a/ohms-law.md b/ohms-law.md index 17b05f8..9e4c732 100644 --- a/ohms-law.md +++ b/ohms-law.md @@ -28,4 +28,4 @@ $$ P &= I \times (I \times R) \\ &= I^{2}R \end{align*} -$$ \ No newline at end of file +$$ diff --git a/professionalism.md b/professionalism.md new file mode 100644 index 0000000..cdbd547 --- /dev/null +++ b/professionalism.md @@ -0,0 +1,54 @@ +--- +id: +aliases: [] +tags: + - authorship/original + - destiny/permanent + - topic/organization +title: Professionalism +--- +# Professionalism + + + +## `TALK` + +I want to use this note to talk about +what makes an expert and +what makes an "expert". + +* imposter syndrome +* effectiveness vs productivity +* traits valued by employers/clients +* being a "salesman" of your abilities + +### Being a Salesman of Your Ability + +To "sell" something in the sales sense +is to make it more appealing _without changing it_. +A cynic might call this lying. +A more fair take is that people generally present their ability as less than it is. + +I suspect that the most knowledgeable +and technically effective practitioners of any field +are not known to be such. + +To be a salesman of some ability +is a deviation from specialization in that ability. +Every bit of [[individual-ability#Capacity for Familiarity|capacity]] +devoted to salesmanship +is a bit less to the skill itself. + +> [!example] +> Mike Holt has a better grasp on code than most, +> but there are likely hundreds better than him +> specifically in that aspect. +> +> It is his salesmanship, his visible confidence in his ability, +> that makes up the difference. + +### Optics, or Playing the Game + +#### Example: Notetaking + +note-takers always look more valuable than they would otherwise. diff --git a/resolving-process-uncertainty.md b/resolving-process-uncertainty.md new file mode 100644 index 0000000..8bc6a31 --- /dev/null +++ b/resolving-process-uncertainty.md @@ -0,0 +1,62 @@ +--- +id: +aliases: [] +tags: + - authorship/original + - destiny/permanent + - status/incomplete + - topic/organization + - type/guide +title: Resolving Process Uncertainty +--- +# Resolving Process Uncertainty + +## Process Uncertainty Resolution Steps + +1. **Check your [[#Writing Process Notes|notes]]** +2. **[[#Asking Process Questions|Ask]] a ==peer== whose answers you trust** +3. **Ask your immediate supervisor** + +Only escalate if you are still uncertain. + +## Writing Process Notes + + + +### `TALK` + +Taking notes has many benefits, +many of which I would not list as such + +* **deferring responsibility:** + +* **optics:** + note-takers always look more valuable than they would otherwise. + +### Citation + +When you get an answer to a [[#Asking Process Questions|question]], +or otherwise get some useful direction +that you expect to use later, +You should add it to your notes as soon as possible. + +With any direction you should include: + +* **who** said it, +* **when** they said it, and +* **what** it was in reference to. + +```md +> [!quote] +``` + +## Asking Process Questions + +Ask your question as succinctly as possible **first**, +provide background or complications **after**. + +Prepare for any obvious clarifying questions. + +### Choosing Your Target + + diff --git a/voltage-drop.md b/voltage-drop.md new file mode 100644 index 0000000..0dc968d --- /dev/null +++ b/voltage-drop.md @@ -0,0 +1,107 @@ +--- +id: +aliases: [] +tags: + - authorship/original + - destiny/permanent + - status/incomplete + - topic/construction/electrical +title: Voltage Drop +--- +# Voltage Drop + +> [!info] Ohm's Law +> +> $$ +> V = I \times R, \quad R = \frac{V}{I}, \quad I = \frac{V}{R} +> $$ + +## Step 1: Effective Impedance $Z$ + +$$ +Z = R \cos(\theta) + X \sin(\theta) +$$ + +where +* $Z$ = Effective impedance +* $R$ = AC resistance +* $X$ = Reactance +* $\theta$ = Power factor angle = $\arccos(PF)$ + +### Parallel Runs + +The equivalent resistance of parallel resistances is given by + +$$ +\frac{1}{R_{\text{eq}}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \dots + \frac{1}{R_n} +$$ + +For $n$ parallel resistances of value $R$ + +$$ +\begin{align*} +\frac{1}{R_{\text{eq}}} &= n \times \left(\frac{1}{R}\right) \\ +&= \frac{n}{R} \\ +R_{\text{eq}} &= \frac{R}{n} +\end{align*} +$$ + +## Step 2: Voltage Drop + +> [!important] +> This section assumes a 3-phase +> 208Y/120V or 480Y/277V voltage system + +> [!info] 3-Phase Voltage +> +> $$ +> V_{L} = \sqrt{3} \times V_{P}, \quad V_{P} = \frac{V_{L}}{\sqrt{3}} +> $$ + +3% allowable voltage drop for a 120V line-to-neutral load: + +$$ +\text{Max}\ \Delta V = 0.03 \times 120 \text{V}_{P} = 3.60 \text{V}_{P} +$$ + +3% allowable voltage drop for a 208V line-to-line load: + +$$ +\text{Max}\ \Delta V = 0.03 \times 208 \text{V}_{L} = 6.24 \text{V}_{L} +$$ + +### Line to Neutral Loads + +$$ +\Delta V_{P} = I \times Z \times 2L +$$ + +### Line to Line Loads + +$$ +\Delta V_{L} = I \times Z \times 2L +$$ + +### 3-Phase Loads + +$$ +\Delta V_{3\phi} = \sqrt{3} \times \left( I \times Z \times L ) +$$ + +where +* $\Delta V$ = Voltage drop in volts ($V$) +* $I$ = Current in amperes ($A$) +* $L$ = Length of wire one way in feet ($\text{ft}$) + +> [!important] +> "Current" is not the OCPD rating, +> but the actual load. + +*** + +It is often more useful to know the maximum length +a certain wiring configuration is suitable for. + +$$ +L = \frac{ \Delta V }{ I \times M } \times \frac{1}{Z} +$$ diff --git a/write-more-philosophy.md b/write-more-philosophy.md new file mode 100644 index 0000000..8b30fd3 --- /dev/null +++ b/write-more-philosophy.md @@ -0,0 +1,29 @@ +--- +id: +aliases: [] +tags: + - authorship/original + - destiny/fleeting + - type/task +title: Write More Philosophy +--- +# Write More Philosophy + +I've been making steady progress on the factual content of [[this-notebook]], +however it's getting drier with every `#type/encyclopedia`. + +I want to write more opinionated, less universally agreeable pieces. + +## Recent Additions + +What one _should_ do with their life: + +* [[notetaking]] + +What traits people _should_ value: + +* [[professionalism]] + +What is _wrong_ but widely accepted: + +* [[individual-ability]]