# SparkQuote NEC calculators (remote · sparkquote.ai)

NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load.

- Trust score: 80/100 (high trust)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `sparkquote.ai`: 80/100 (this document), [markdown](https://verifymcp.io/servers/ai-sparkquote-nec-calculators/sparkquote.md), [page](https://verifymcp.io/servers/ai-sparkquote-nec-calculators/sparkquote)

## Channel facts

- Endpoint: `https://sparkquote.ai/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 60/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 2135 tokens (~213/item across 10 items; 10 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 73/100
  - Stability observed for 22 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 75/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "voltage_drop" implies "drop" and declares readOnlyHint instead, contradicting what its own name says it does.
  - An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the SparkQuote NEC calculators MCP server?

SparkQuote NEC calculators is a hosted endpoint at https://sparkquote.ai/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http ai-sparkquote-nec-calculators 'https://sparkquote.ai/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ai-sparkquote-nec-calculators": {
      "url": "https://sparkquote.ai/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ai-sparkquote-nec-calculators": {
      "type": "http",
      "url": "https://sparkquote.ai/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ai-sparkquote-nec-calculators]
url = "https://sparkquote.ai/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ai-sparkquote-nec-calculators": {
      "type": "remote",
      "url": "https://sparkquote.ai/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ai-sparkquote-nec-calculators --url 'https://sparkquote.ai/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ai-sparkquote-nec-calculators:
    url: "https://sparkquote.ai/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ai-sparkquote-nec-calculators": {
      "Transport": "http",
      "Url": "https://sparkquote.ai/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ai-sparkquote-nec-calculators -t streamable-http -u 'https://sparkquote.ai/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ai-sparkquote-nec-calculators": {
      "type": "http",
      "url": "https://sparkquote.ai/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-21 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (10)

### `wire_size` (~248 tokens)

Wire size calculator

Minimum conductor size for a circuit: NEC Table 310.16 ampacity at the termination temperature rating, the 240.4(D) small-conductor limits, voltage drop over the run, and the Table 250.122 equipment grounding conductor, increased in proportion under 250.122(B) when voltage drop upsizes the conductors.

Input parameters:

- `amps` (number, required): Breaker / load (A).
- `feet` (number, required): One-way distance (ft).
- `limit` (number, required): Max voltage drop (%).
- `material` (string, required): Conductor. "cu" = Copper; "al" = Aluminum.
- `phase` (string, required): Phase. "1" = Single-phase; "3" = Three-phase.
- `temp` (string, required): Termination rating. "60" = 60°C (NM-B, UF); "75" = 75°C (THHN in conduit); "90" = 90°C.
- `volts` (string, required): Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `voltage_drop` (~366 tokens)

Voltage drop calculator

Voltage drop for a given conductor size, current and one-way length, single- or three-phase, from NEC Chapter 9 Table 8 circular mils (VD = 2·K·I·L / CM, or √3 for three-phase).

Input parameters:

- `amps` (number, required): Load current (A).
- `awg` (string, required): Size. "14" = 14 AWG; "12" = 12 AWG; "10" = 10 AWG; "8" = 8 AWG; "6" = 6 AWG; "4" = 4 AWG; "3" = 3 AWG; "2" = 2 AWG; "1" = 1 AWG; "1/0" = 1/0 AWG; "2/0" = 2/0 AWG; "3/0" = 3/0 AWG; "4/0" = 4/0 AWG; "2…
- `feet` (number, required): One-way distance (ft).
- `material` (string, required): Conductor. "cu" = Copper; "al" = Aluminum.
- `phase` (string, required): Phase. "1" = Single-phase; "3" = Three-phase.
- `volts` (string, required): Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `watts_to_amps` (~128 tokens)

Watts to amps calculator

Current drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.

Input parameters:

- `pf` (number, required): Power factor.
- `phase` (string, required): Phase. "1" = Single-phase; "3" = Three-phase.
- `volts` (string, required): Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.
- `watts` (number, required): Power (W).

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `conduit_fill` (~356 tokens)

Conduit fill calculator

Percent fill and maximum number of THHN/THWN-2 conductors of one size in EMT or PVC Schedule 40, from NEC Chapter 9 Tables 1, 4 and 5.

Input parameters:

- `awg` (string, required): THHN/THWN-2 size. "1" = 1 AWG; "2" = 2 AWG; "3" = 3 AWG; "4" = 4 AWG; "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "1/0" = 1/0 AWG; "2/0" = 2/0 AWG; "3/0" = 3/0 AWG; "4/0" =…
- `count` (number, required): Number of conductors.
- `size` (string, required): Trade size. "1" = 1"; "2" = 2"; "3" = 3"; "4" = 4"; "1/2" = 1/2"; "3/4" = 3/4"; "1-1/4" = 1-1/4"; "1-1/2" = 1-1/2"; "2-1/2" = 2-1/2"; "3-1/2" = 3-1/2".
- `type` (string, required): Conduit type. "EMT" = EMT; "PVC-40" = PVC Schedule 40.

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `box_fill` (~198 tokens)

Box fill calculator

Minimum outlet box volume from NEC 314.16(B): conductor, device (2 each), clamp and grounding allowances times the Table 314.16(B) volume for the largest conductor.

Input parameters:

- `awg` (string, required): Largest conductor. "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "16" = 16 AWG; "18" = 18 AWG.
- `clamps` (string, required): Internal cable clamps. "0" = None; "1" = One or more.
- `conductors` (number, required): Insulated conductors (not counting grounds).
- `devices` (number, required): Devices (switches, receptacles).
- `grounds` (string, required): Equipment grounding conductors. "0" = None; "1" = One or more.

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `load_calculator` (~224 tokens)

Residential load calculator (NEC 220.82)

Dwelling service load by the NEC 220.82 optional method: 3 VA/ft² lighting, small-appliance and laundry circuits, fixed appliances, demand factor, heating or cooling, and the minimum standard service size. Leave an appliance out to count it as 0 VA.

Input parameters:

- `dishwasher` (number): Dishwasher (VA). Optional.
- `disposal` (number): Disposal (VA). Optional.
- `dryer` (number): Dryer (VA). Optional.
- `ev` (number): EV charger (VA). Optional.
- `heater` (number): Water heater (VA). Optional.
- `hvac` (number): Largest of heating or cooling (VA). Optional.
- `laundry` (string, required): Laundry circuit. "1" = Yes (1,500 VA); "0" = No.
- `other` (number): Other fixed appliances (VA). Optional.
- `range` (number): Range / cooktop (VA). Optional.
- `small` (number, required): Small-appliance circuits.
- `sqft` (number, required): Living area (ft²).

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `ohms_law` (~83 tokens)

Ohm's law calculator

Ohm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.

Input parameters:

- `i` (number): Current (A). Optional.
- `p` (number): Power (W). Optional.
- `r` (number): Resistance (Ω). Optional.
- `v` (number): Voltage (V). Optional.

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `panel_schedule` (~139 tokens)

Panel schedule generator

Lays circuits out on a 120/240 V single-phase or 208Y/120 V three-phase panel and totals the load per phase with the imbalance.

Input parameters:

- `circuits` (string, required): Circuits: description, breaker A, poles, VA (one per line)
- `spaces` (string, required): Spaces. "12" = 12; "20" = 20; "24" = 24; "30" = 30; "42" = 42.
- `system` (string, required): Panel. "1" = 120/240 V single-phase; "3" = 208Y/120 V three-phase.

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `bid_calculator` (~132 tokens)

Electrical bid calculator

Electrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).

Input parameters:

- `direct` (number): Permits and other job costs ($). Optional.
- `hours` (number, required): Labor hours (h).
- `margin` (number, required): Target net margin (%).
- `markup` (number): Material markup (%). Optional.
- `materials` (number, required): Material cost ($).
- `overhead` (number, required): Overhead (% of direct cost) (%).
- `rate` (number, required): Burdened labor cost ($/h).

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

### `nec_ampacity` (~157 tokens)

NEC Table 310.16 ampacity lookup

Allowable ampacity of one insulated conductor from NEC Table 310.16 (not more than three current-carrying conductors in a raceway or cable, 30°C ambient), before any adjustment or correction factors and before the 240.4(D) small-conductor limits.

Input parameters:

- `material` (string, required): "cu" = copper; "al" = aluminum.
- `size` (string, required): Conductor size: AWG ("14" … "4/0") or kcmil ("250" … "500").
- `temp` (string, required): Temperature column in °C: 60 (NM-B, UF), 75 (THWN, most terminations), 90 (THHN, for derating).

Output parameters:

- `code` (string)
- `inputs` (object)
- `ok` (boolean)
- `rows` (array)
- `summary` (string)
- `table` (object)
- `url` (string)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/ai-sparkquote-nec-calculators/sparkquote#diagnostics

## Score history

- 2026-11-05: 80
- 2026-11-04: 79
- 2026-11-03: 79
- 2026-11-02: 78
- 2026-11-01: 78
- 2026-10-31: 77
- 2026-10-30: 77
- 2026-10-29: 76
- 2026-10-28: 76
- 2026-10-27: 75
- 2026-10-26: 75
- 2026-10-25: 74
- 2026-10-24: 74
- 2026-10-23: 74
- 2026-10-22: 73
- 2026-10-21: 73
- 2026-10-20: 72
- 2026-10-19: 72
- 2026-10-18: 71
- 2026-10-17: 71
- 2026-10-16: 70
- 2026-10-15: 70
- 2026-10-14: 69

## Common questions

### What is the SparkQuote NEC calculators MCP server?

SparkQuote NEC calculators is an MCP server listed in the public MCP registry as ai.sparkquote/nec-calculators. NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load. This page covers its hosted endpoint (https://sparkquote.ai/mcp).

### Is the SparkQuote NEC calculators MCP server safe to use?

SparkQuote NEC calculators scores 80 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the SparkQuote NEC calculators MCP server expose?

SparkQuote NEC calculators exposes 10 tools: wire_size, voltage_drop, watts_to_amps, conduit_fill, box_fill, and 5 more. Their descriptions and schemas cost roughly 2,031 tokens of context every time the server is loaded.

### Does the SparkQuote NEC calculators MCP server require authentication?

No. We connected to SparkQuote NEC calculators without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the SparkQuote NEC calculators MCP server still maintained?

SparkQuote NEC calculators is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://sparkquote.ai/mcp
- Website: https://sparkquote.ai/tools/mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/ai-sparkquote-nec-calculators/sparkquote.xml
- Changelog JSON feed: https://verifymcp.io/servers/ai-sparkquote-nec-calculators/sparkquote.json
- HTML version of this page: https://verifymcp.io/servers/ai-sparkquote-nec-calculators/sparkquote