Dwelling Service Load Calculation Worksheet

Direct answer

Residential electricians use this workflow to draft a service load calculation worksheet for a 200-amp upgrade on a 1974 house that is adding an EV charger and a heat pump. Older services often look fine until the heat pump and charger are added together. The draft is arranged so a licensed person can review it against NEC Article 220 and the local amendment. It is not a signed inspection, a code determination, or a price commitment.

How to use this workflow

1. Collect the job facts: address or project name, what you could see, and what you did not open.
2. Paste the workflow into your AI tool and replace every bracketed field. Delete any line that does not apply.
3. Require these groups in the draft: general lighting, small appliances, laundry, fixed appliances, HVAC, EV charger, demand factors.
4. Read the draft against NEC Article 220 and the code adopted for that job. Replace any invented section number with "verify in the adopted code".
5. The licensed person marks status, signs, and files the document with the job. Do not send an unsigned draft to a customer as a finished record.

Sources to verify

• NEC Article 220
• Manufacturer instructions for the equipment on this job
• The code edition adopted by the authority having jurisdiction

This workflow is a drafting aid. It is not an inspection, a code determination, or legal advice. A licensed professional must verify the result against the code adopted for that job before anyone relies on it.