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SparkQuote NEC calculators

Q: Is SparkQuote NEC calculators MCP server safe?

QAmcp's test on 18 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 10 of its tools are labeled read-only. Overall it scored 80/100 on 18 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by sparkquote.ai · https://sparkquote.ai/mcp

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

10 tools✓ all read-only✓ no account neededPricing: on their site

See pricing →Visit website

80 /100

FAIL

10 of 10 checks · 18 Oct 2026

Is SparkQuote NEC calculators MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 10 of its tools are labeled read-only.
Overall it scored 80/100 on 18 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

10 tools, in the server's own words.

wire_sizeread-only

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 t…

voltage_dropread-only

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…

watts_to_ampsread-only

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

conduit_fillread-only

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.

box_fillread-only

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 condu…

load_calculatorread-only

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 c…

ohms_lawread-only

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

panel_scheduleread-only

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.

bid_calculatorread-only

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

nec_ampacityread-only

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), befo…

Test results

Safe mode: only tools labeled read-only were run. How the test works

✕
Tools are labeled safe or dangerous
1 failed
- ✕voltage_drop: Name sounds like it deletes something, but it is labeled read-only
fail
!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Bad inputs give a clean error
4 warnings
- !wire_size: Accepted wrong type for "material" without complaining
- !conduit_fill: Accepted wrong type for "type" without complaining
- !box_fill: Accepted wrong type for "awg" without complaining
- !panel_schedule: Accepted wrong type for "system" without complaining
- and 6 more
note
✓
ConnectsConnected in 1.6 s
pass
✓
Lists its toolsFound 10 tools
pass
✓
Every tool is describedAll 10 tools and their inputs are described
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓wire_size: Worked (344 ms)
- ✓watts_to_amps: Worked (273 ms)
- ✓conduit_fill: Worked (292 ms)
- ✓box_fill: Worked (256 ms)
- ✓load_calculator: Worked (263 ms)
- ✓ohms_law: Answered with an error, probably because of our sample input: Fill in exactly two positive values; the other two are calculated. Source: SparkQuote, NEC 2023 (NFPA 70): https://sparkquote.ai/tools/ohms…
- ✓panel_schedule: Worked (278 ms)
- ✓bid_calculator: Worked (267 ms)
- and 2 more
pass
✓
Fast enough
All good
- ✓Connecting took 1.6 s
- ✓Listing tools took 244 ms
- ✓Average tool answer: 277 ms
- ✓wire_size: Slowest tool: wire_size (344 ms)
pass
✓
No secrets leakedChecked 7 error messages: no secrets or internal details
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://sparkquote.ai/mcp

Score over time

15 Oct 202675
17 Oct 202680
18 Oct 202680

Reviews

Coming soon: reviews from people who use SparkQuote NEC calculators, signed in with GitHub, one per person. Reviews never change the score.

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