electrical

## What I do - Explain electrical concepts and terminology - Provide safety guidance for electrical work - Guide on electrical equipment selection - Assist with wiring and installation questions - Support troubleshooting of electrical issues ## When to use me - When working on residential or commercial wiring - When selecting electrical components or equipment - When understanding electrical safety - When planning electrical installations - When troubleshooting electrical problems ## Key Concepts ### Electrical Safety ```python # Electrical safety parameters SAFETY_THRESHOLDS = { "current_mA": { "perception": 1, # mA - sensation "muscular_control": 10, # mA - can't let go "ventricular_fibrillation": 100, # mA "cardiac_arrest": 1000 # mA }, "voltage_levels": { "low": "< 50V", "medium": "50V - 1000V", "high": "> 1000V" } } # PPE requirements PPE_CATEGORIES = { "voltage_class": { "0-50V": "None required", "50-500V": "Class 00 insulated tools", "500V-1kV": "Class 0 insulated tools, gloves", "1kV-36kV": "Class 2+ gloves, blankets" } } ``` ### Residential Wiring ```python # Wire gauge selection (AWG) WIRE_GAUGES = { 15: {"ampacity": 15, "use": "Lighting circuits"}, 20: {"ampacity": 20, "use": "General outlets"}, 30: {"ampacity": 30, "use": "Appliances, dryers"}, 40: {"ampacity": 40, "use": "Ranges, AC units"}, 50: {"ampacity": 50, "use": "Large appliances"} } # Voltage drop calculation def voltage_drop_percent(I, L, AWG, V): """VD% = (2 × K × I × L) / CM K = 10.4 (copper), L = one-way length """ cm = {14: 4110, 12: 6530, 10: 10380, 8: 16540}.get(AWG, 10380) k = 10.4 # Copper vd = (2 * k * I * L) / cm return (vd / V) * 100 ``` ### Common Electrical Devices | Device | Rating | Application | |--------|--------|-------------| | Circuit Breaker | 15-200A | Overcurrent protection | | GFCI | 15-20A | Ground fault protection | | AFCI | 15-20A | Arc fault protection | | Surge Protector | Varies | Transient protection | | Transformer | Varies | Voltage conversion | ### Electrical Panels ```python # Panel scheduling PANEL_SCHEDULE = { "main": { "rating": "100A, 200A typical", "breakers": "Single or double pole" }, "branch": { "types": ["15A", "20A", "30A", "40A", "50A"], "spacing": "1/2 inch per breaker" } } ``` ### AC Power Types - **Single-phase**: 120V or 240V, residential - **Three-phase**: 208V or 480V, commercial/industrial - **Split-phase**: 120/240V, US residential - **Grounding**: Safety ground, equipment ground ### Circuit Types | Circuit | Voltage | Application | |---------|---------|-------------| | General Purpose | 120V | Lighting, outlets | | Small Appliance | 120V | Kitchen, laundry | | Fixed Appliance | 240V | Ranges, dryers | | HVAC | 240V | Air conditioning | | Sub-panel | 240V | Distribution |