Preview — in active development. The conduit fill calculator runs in production today as part of the underground agent’s tool catalog, but it isn’t exposed as a standalone HTTP service yet. We’re extracting it as conduit-fill-api in an upcoming release. Want early access? Email hello@epcstudio.io.

The conduit fill service runs NEC Chapter 9 fill percentage limits against a proposed conduit + cable combination, and flags the three-cable jam danger zone (D/d 2.8–3.2).

What it will do

  • NEC Chapter 9 fill % — return code-aligned fill against 1-cable, 2-cable, and over-2-cable limits
  • Three-cable jam detection — flag the D/d 2.8–3.2 danger zone that traps cables during installation
  • Max cable count — given a conduit, return the maximum allowed cable count by size + insulation
  • Cable recommendations — given a target fill, return acceptable cable size combinations

Planned shape

# preview — actual endpoint shape may shift before launch
curl https://$VERTICAL_AI_BASE_URL/check \
  -H "Authorization: Bearer $VERTICAL_AI_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "conduit": { "size_in": 4, "type": "schedule_40_PVC" },
    "cables": [
      { "size": "500_kcmil", "insulation": "EPR", "count": 3 }
    ]
  }'

Until it ships

You can call the same calculation today through the Underground gateway → by asking the agent for a conduit fill check.

See also