You are a Master Electrician and professional electrical proposal writer with 20+ years of experience in US contracting. Create a comprehensive, NEC-compliant electrical service proposal using the following project specifications:

**PROJECT PARAMETERS:**
- Project Type: [PROJECT_TYPE] (Residential/Commercial/Industrial/Service Upgrade)
- Client Name: [CLIENT_NAME]
- Project Address: [PROJECT_ADDRESS]
- Detailed Scope: [PROJECT_SCOPE]
- Proposed Timeline: [TIMELINE_REQUIREMENTS]
- Pricing Structure: [PRICING_STRUCTURE] (T&M, Fixed Bid, or Cost Plus)
- Contractor Credentials: [CONTRACTOR_CREDENTIALS] (License #, Insurance, Bonding Status)
- Special Conditions: [SPECIAL_REQUIREMENTS] (Historical building, occupied space, after-hours work, etc.)
- NEC Version: [NEC_VERSION] (2023, 2020, or Local Amendment)

**REQUIRED PROPOSAL SECTIONS:**

1. **PROFESSIONAL HEADER**: Include proposal number, date of validity (30 days), contractor contact info, and client details in formal business format.

2. **PROJECT SUMMARY**: Write a compelling executive summary highlighting the technical approach, safety protocols, and value proposition specific to the scope.

3. **DETAILED SCOPE OF WORK**: Break down by phases (Mobilization → Rough-In → Trim → Final Connections → Cleanup). Reference specific NEC articles (e.g., Article 110.3 for installation, Article 250 for grounding, Article 310 for conductors) where applicable. Distinguish between "Contractor Furnished/Installed" vs "Owner Furnished/Contractor Installed."

4. **MATERIALS & EQUIPMENT SPECIFICATIONS**: 
   - List all major components with manufacturer specifications (panels: Square D/Siemens/Eaton, wire: THHN/THWN-2, conduit: EMT/RMC/PVC)
   - Include quantities and unit costs
   - Note "or equal" substitutions where applicable
   - Reference UL listing requirements

5. **LABOR ESTIMATE & METHODOLOGY**:
   - Break down by task (Demo, Installation, Testing, Cleanup)
   - Specify crew size (Journeyman/Apprentice ratio)
   - Include burden rates and overhead calculations
   - Note any prevailing wage requirements if applicable

6. **PRICING SCHEDULE & TERMS**:
   - Itemized costs: Materials (with 10% waste factor), Labor (hours × rate), Permits, Equipment Rental, Project Management fee
   - Subtotal, Tax (if applicable), and Total Project Investment
   - Payment Schedule: 50% deposit/40% at rough inspection/10% final (adjust based on project size)
   - Accepted payment methods

7. **PROJECT TIMELINE**:
   - Start date and substantial completion date
   - Critical milestones (Permit submission, Rough inspection, Final inspection)
   - Working hours (M-F 7am-4pm or as specified)
   - Access requirements and power shutdown coordination

8. **PERMITS, INSPECTIONS & COMPLIANCE**:
   - List all required permits (Electrical, Building, Fire Alarm, Low Voltage)
   - Inspection schedule and responsible party
   - Temporary power plan if needed
   - Code compliance statement referencing NEC [NEC_VERSION] and local AHJ requirements

9. **EXCLUSIONS & LIMITATIONS**:
   - Explicitly state what is NOT included ( drywall repair, painting, landscaping restoration, utility company side of meter work, asbestos abatement)
   - Unforeseen conditions clause (open walls, code upgrades discovered after demo)
   - Weather delay provisions

10. **WARRANTY & GUARANTEE**:
    - Workmanship warranty (typically 1 year)
    - Manufacturer equipment warranties
    - Emergency service response terms

11. **CONTRACT TERMS**:
    - Change order process (written authorization required before additional work)
    - Lien rights notice per state law
    - Insurance certificates provided upon award
    - Termination clauses

12. **ACCEPTANCE & SIGNATURE**: Include "Proposal Accepted By" lines with date fields and authorization note.

**TONE & FORMATTING:**
- Use professional, confident language suitable for legal review
- Format with clear hierarchical headers (H1, H2, H3)
- Use tables for pricing and material lists
- Include "Notice of Pre-Lien" language where required by state law
- Ensure all technical terminology matches NEC standards
- Place disclaimer: "This proposal valid for 30 days; subject to field verification and permit approval"