Spark Pack: how to connect
Free tools a UK electrician's AI assistant uses on the job: cable size, voltage drop and Zs with the working shown, Part P notification, EIC, Minor Works and EICR checks, and G98, G99, EV and heat pump connection rules.
Spark Pack is a remote MCP server: a set of tools your AI assistant can call. You do not open it like a website. You add its address to your AI app once, then just talk to your assistant as normal.
Server address: https://spark-pack.nerolabs.workers.dev/mcp
Sign-in: None. No account, no key and no sign-in: add the address and use it.
Connect it in Claude
- Open Claude (claude.ai or the desktop app) and go to Settings, then Connectors.
- Choose Add custom connector. Name it Spark Pack and paste
https://spark-pack.nerolabs.workers.dev/mcpas the URL. - Save, then turn it on in a chat from the tools menu.
Claude Code: claude mcp add --transport http spark-pack https://spark-pack.nerolabs.workers.dev/mcp
Connect it in ChatGPT
- In ChatGPT go to Settings, then Apps and connectors, then Advanced settings, and switch on Developer mode (needed for any custom connector).
- Back in Apps and connectors, choose Create. Name it Spark Pack, paste
https://spark-pack.nerolabs.workers.dev/mcpas the MCP server URL and pick No authentication. - Tick that you trust the app and press Create. Then pick it from the tools menu in a new chat.
Other MCP apps (Cursor, VS Code, Windsurf, Gemini CLI and more)
Add a remote server with the Streamable HTTP transport. Most apps take a JSON block like this:
{
"mcpServers": {
"spark-pack": { "type": "http", "url": "https://spark-pack.nerolabs.workers.dev/mcp" }
}
}
Three things to try
The tools
| Tool | What it does |
|---|---|
list_capabilities | What Spark Pack can do Lists Spark Pack's tools, the regulations edition it targets, what it covers (nations, circuit types, cable types, installation methods) and what it deliberately does not do. |
size_cable | Cable size, voltage drop and earth fault loop check Sizes a UK final circuit or sub-main and shows the working: design current (with cooker diversity), protective device rating, the smallest cable size that passes current-carrying capacity, voltage drop (3% lighting, 5% other) and earth... |
check_part_p | Is this job notifiable under Part P? Answers whether domestic electrical work in England or Wales must be notified to building control under Part P of the Building Regulations, with the reason and what to do next (self-certify through a competent person scheme within 30 days,... |
get_certificate_schema | Certificate fields as a JSON schema Returns the fields an Electrical Installation Certificate (eic), Minor Electrical Installation Works Certificate (minor_works) or Electrical Installation Condition Report (eicr) needs, as a JSON Schema the assistant fills from the job... |
check_certificate | Check a filled certificate Checks a filled EIC, Minor Works certificate or EICR (shape from get_certificate_schema) and returns `ready_to_transfer`, every missing required field by path, errors (readings that fail: insulation resistance under 1 megohm at 500 V,... |
check_grid_connection | G98, G99 or EV and heat pump notification? For solar PV, batteries, V2G chargers, EV chargers and heat pumps in Great Britain: says which network operator process applies and when. |
trade_profile | Check the electrician's business details Checks the electrician's own business details (Nero Trade Profile v1: trading name, Companies House number, competent person scheme and number, postcode, contact) and returns them cleaned, with a stable `nero_trade_ref` computed from the... |
Good to know
- Built for UK electricians. Every answer shows its working and sources and lists what the trade must check. The trade doing the work stays responsible for it.
- Free forever: no sign-up, no key, no daily cap, no paid plan.
- What is stored and how to delete it: see Privacy.
Support
Email founder@neroengine.com. Say which tool you used and what you asked; we reply within 2 working days.
Nero Engine Group Ltd (company 16521432, England and Wales), trading as Nero Labs. Page updated 12-11-2026.