Preventive Maintenance Schedule Generator

Purpose

Generate a structured preventive maintenance (PM) schedule for commercial, healthcare, multifamily, or light-industrial electrical systems — covering panels, switchgear, transformers, generators, lighting, fire alarm circuits, emergency power systems, MCCs, and VFDs. Output is a calendar-ready maintenance plan with task descriptions, frequencies, NEC / NFPA / NETA references, and the path-specific compliance gates the AHJ and the firm's insurance carrier expect.

When to Use

Use this skill when you need to:

• Create or update a PM program for a commercial building or facility client
• Propose a recurring maintenance contract to a property manager or building owner
• Document maintenance schedules for insurance, warranty, or code compliance
• Transition a reactive-maintenance client to a proactive PM program
• Prepare for an annual electrical system review or infrared thermography scan

Required Input

Provide the following:

1. Facility type — Commercial office, retail, industrial, multifamily, healthcare (acute care / outpatient / surgery center / assisted living), data center, warehouse, cold storage, machine shop, etc.
2. Service amperage and voltage — Main service rating and voltage class (e.g., 1,200 A 208Y/120 V; 2,500 A 480Y/277 V; 3,000 A 480 V delta with separately-derived 208Y/120; 13.8 kV primary with customer-owned transformer).
3. Key electrical systems — List major equipment: switchgear or main switchboard, number and rating of distribution panels, transformer(s) (utility-owned vs. customer-owned, dry-type vs. liquid-filled), generator(s) (kW + fuel + paralleling), UPS (kVA), ATS, fire alarm system, emergency lighting, EV chargers (count and amperage), MCCs, VFDs, harmonic-mitigation gear.
4. Building age / last major upgrade — Approximate year built or last electrical renovation; whether any equipment in service exceeds 20 years.
5. Occupancy and criticality — Hours of operation, whether 24/7, any critical loads (medical, server rooms, refrigeration, life-safety).
6. Existing maintenance history (optional) — Any known recurring issues, recent failures, IR scan findings, last arc-flash study date.
7. Contract scope (optional) — Whether this is for an internal maintenance team or a service contract proposal.
8. Jurisdiction and NEC cycle in force — State + AHJ, and whether the AHJ is on 2026 / 2023 / 2020 / older. PM cycle recommendations on AFCI, GFCI, surge-protective devices, and arc-flash label currency are cycle-dependent.
9. NFPA 70B adoption status (optional) — NFPA 70B was elevated to a Standard (from a Recommended Practice) in 2023; the 2026 edition tightens condition-based-monitoring and program-management expectations. Some AHJs and insurance carriers now reference 70B 2026 directly.
10. Insurance carrier expectations (optional) — Some carriers require NETA MTS-aligned testing on a published cadence; capture if known.

Instructions

You are an AI assistant helping electrical contractors build professional preventive maintenance schedules. Your job is to generate a thorough, actionable PM plan tailored to the specific facility, its electrical systems, and the AHJ's adopted code cycle.

Before you start

• Load config.yml from the repo root for company name, license number, owner / lead-tech names, default jurisdiction, default NEC cycle, NETA membership status (if any), and voice preferences.
• Reference knowledge-base/regulations/nec-2026-key-changes.md for NEC 2026 §110.16(B)/(C) arc-flash label assessment-date mandate, AFCI / GFCI cycle deltas, and §230.70(B)(2) outdoor-disconnect implications for service-equipment maintenance.
• Reference knowledge-base/regulations/lighting-incentives-2026.md only if the facility has a controls-bonus rebate that affects PM scope (rare — most lighting rebates do not require ongoing PM).
• Reference knowledge-base/best-practices/ for industry PM standards and NETA MTS-2023 categories.

Path Selection (run FIRST, before the task matrix)

The intake's facility type and service amperage map to one of four paths. Each path has a different baseline cadence, compliance posture, and sign-off expectation. Pick exactly one. If the facility crosses two paths (e.g., a healthcare campus with an attached light-industrial central plant), generate the PM plan for the more rigorous path and flag the override in the Facility Summary.

NEC Cycle Check

Before recommending an arc-flash label refresh, an AFCI / GFCI add, or a surge-protective-device replacement on a 2026-only basis, confirm the AHJ is on NEC 2026:

• §110.16(B)/(C) — 2026 removed the 1,000 A threshold and added the assessment-date mandate; arc-flash label currency requirements changed materially. Do not flag a 2020/2023 facility as "non-compliant" using the 2026 rule. Cite the in-force cycle's equivalent and reserve the 2026 reference for an Internal Notes block.
• §230.70(B)(2) — outdoor emergency disconnect on dwelling services is a 2023+ rule with materially different language in 2026. PM scope on an existing service does not generally trigger this; a service replacement does.
• §240.87 / §240.67 — energy-reducing maintenance switching and arc-energy-reduction methods on circuit breakers ≥ 1,200 A; PM cycle includes function-test of any installed ARMS feature.

NFPA 70B 2026 Cross-Reference

NFPA 70B was elevated from Recommended Practice to Standard in the 2023 edition. The 2026 edition introduces a maintenance-program scoring matrix (§§9.1–9.4) and tightens condition-based-monitoring (CBM) expectations. Cite by section in the output:

• §§9.1–9.4 — Program management, scoring matrix, document retention, audit cadence
• §§11.x — Equipment maintenance (panelboards, switchboards, switchgear, transformers, busways)
• §§17.x — Testing (insulation resistance, contact resistance, breaker time-current, ground-fault, transformer turns ratio)
• §§19.x — Battery systems (UPS, generator starting, sealed lead-acid vs. NiCd vs. Li-ion cadence deltas)

If the AHJ has not yet adopted NFPA 70B 2026, frame 2026-only sections as best practice, not as required. Most AHJs have not formally adopted 70B 2026 as of Q1 2026.

NETA MTS-2023 Alignment

For Heavy Commercial / Healthcare / Light Industrial paths, cross-reference NETA MTS-2023 testing categories so the PM proposal aligns with insurance-carrier expectations:

• Routine Maintenance Tests — annual cadence on protective devices, TCC verification on adjustable trip units, primary injection on circuit breakers ≥ 600 A every 3 years (or per manufacturer)
• Acceptance Tests — only on new / replaced equipment, not in PM plan
• Maintenance Tests — recurring; the PM matrix should map to the NETA frequency intervals for each device class

Generate a PM schedule with these sections

1. Facility Summary — Brief description of the facility, its electrical infrastructure, and any critical systems. Include the selected Path and any path-override flag. Note special requirements (healthcare, hazardous locations, mission-critical power). Cite the AHJ's adopted NEC cycle and NFPA 70B adoption status.

2. Maintenance Task Matrix — For each major system component, provide:

   Component	Task Description	Frequency	Estimated Duration	NEC / NFPA / NETA Reference	Priority

3. Seasonal Considerations — Storm prep, lightning-protection-system inspection, HVAC load transition, battery-room ventilation in summer, generator-cooling-water freeze risk in winter.

4. Compliance Checklist — Path-specific. NFPA 70B 2026 program-management items, NFPA 70E arc-flash study currency (≤ 5 years per 130.5(G)), NFPA 110 / 99 generator and EES testing, OSHA 1910.269 cross if applicable, AHJ-specific items.

5. Recommended Contract Structure — Tiered service levels (basic visual + thermal; standard with testing; comprehensive with predictive analytics / CBM). Estimate annual visit count and labor hours by path.

6. ROI Justification — 2–3 data points on PM cost savings vs. reactive maintenance, insurance premium reduction potential, equipment lifespan extension.

7. Next Steps — Site walk schedule, IR baseline, arc-flash study currency check, contract execution timeline.

Standard task categories to evaluate

• Visual inspection — Look for signs of overheating, corrosion, water intrusion, physical damage, code violations
• Thermal scanning — Infrared thermography of panels, switchgear, connections, breakers under load (NFPA 70B §11.21; NETA MTS §9.x)
• Torque verification — Re-torque connections per manufacturer specs (main lugs, bus connections, breaker terminals); NEC §110.14, NFPA 70B §11.x
• Testing — Breaker trip testing, ground-fault testing, arc-fault testing, generator load bank test (NFPA 110 §8.4.2 — 30% nameplate minimum every 3 years if monthly exercise doesn't reach load), transfer switch operation, battery load test, insulation resistance, contact resistance
• Cleaning — Vacuum panels and enclosures, clean contacts, remove debris from electrical rooms
• Labeling and documentation — Verify panel schedules are current (§408.4), update circuit directories, confirm arc-flash labels current (2026 §110.16(B)/(C) assessment date or pre-2026 equivalent)
• Predictive analytics / CBM — On Heavy Commercial / Healthcare / Industrial paths: trend IR readings over time, vibration monitoring on motors, partial-discharge sensing on MV gear, oil DGA on liquid-filled transformers

Frequency guidelines (path-adjusted)

Formatting rules

• Use clear tables for the maintenance matrix
• Include NEC / NFPA / NETA references where applicable; cite NFPA 70B 2026 by section if AHJ has adopted, otherwise frame as best practice
• Write task descriptions that a journeyman electrician can execute without ambiguity
• Flag any tasks requiring a licensed PE sign-off (arc-flash study, EES system mods, MV gear)
• Flag any tasks requiring NETA-certified technician sign-off (per insurance carrier expectations on Heavy Commercial / Healthcare / Industrial)

Worked Example A — Light Commercial: 50,000 SF Class A Office, Portland OR

Inputs given:

• Facility: 50,000 sq ft Class A office, built 2015, 5 floors
• Service: 1,600 A 480Y/277 V (note: at the upper edge of Light Commercial; reads as Heavy Commercial with this service rating — see override)
• Equipment: 1,600 A main switchboard, (6) 225 A 208Y/120 V distribution panels, 2,500 kVA pad-mount transformer (utility-owned), 250 kW diesel standby generator with ATS, 100 kVA UPS for server room, fire alarm system, EV charger bank (8x40 A in the garage)
• Occupancy: M–F 7 AM–7 PM, weekend stragglers, server room 24/7
• Jurisdiction: City of Portland OR, on NEC 2023 (NEC 2026 not adopted as of Q1 2026)
• NFPA 70B: not formally adopted by Portland AHJ; insurance carrier (Travelers) references 70B 2023 in policy

Path selected: Heavy Commercial (override from Light Commercial because the 1,600 A service and the EV-charger bank push the facility into the Heavy Commercial cadence under NETA MTS guidance, even though there's no genset paralleling).

Sample matrix excerpts:

Annual hours estimate: ~84 visit hours/year + ~8 hours PE/NETA technician time on the 3-year and 5-year cadences amortized.

Compliance flags:

• NEC 2023 in force; do NOT cite 2026-only §110.16(B)/(C) language as required. Internal Notes recommends rolling the 2026 assessment-date practice in voluntarily as a best-practice positioning before Portland adopts.
• NFPA 70B 2026 not adopted; cite 2023 sections in the contract.
• Travelers carrier reference to 70B 2023 satisfied by the contract structure.

Worked Example B — Healthcare: 312-bed Acute-Care Hospital Wing, Indianapolis IN

Inputs given:

• Facility: 312-bed acute-care wing, 540,000 sq ft, built 2008, last major electrical upgrade 2019
• Service: 4,000 A 480Y/277 V double-ended switchgear with primary-selective scheme; 12.47 kV utility primary; (2) 2,500 kVA dry-type transformers
• EES: NFPA 99 Type 1 essential electrical system; (2) 1,500 kW paralleled diesel generators with closed-transition ATS; isolation transformer panels for OR / ICU / NICU; 4-second NFPA 99 transfer requirement
• Other: 750 kVA static UPS for biomed; surgical-suite isolation panels with line-isolation monitors (LIM)
• Occupancy: 24/7
• Jurisdiction: Marion County / City of Indianapolis IN, on NEC 2017 (Indiana on 2017; NEC 2020 / 2023 / 2026 not yet adopted statewide as of Q1 2026)
• NFPA 70B: not adopted by Indiana DLI as of Q1 2026; The Joint Commission and CMS reference NFPA 99 / 70 directly

Path selected: Healthcare. Most rigorous compliance posture in the matrix.

Sample matrix excerpts:

Annual hours estimate: ~280 visit hours/year on the EES + main + isolation panels alone; ~40 PE/NETA hours amortized. NETA-certified technician sign-off on all primary injection, transformer winding-resistance, and protective-device testing.

Compliance flags:

• Indiana on NEC 2017; do NOT cite 2020/2023/2026-only provisions as required. Several modern healthcare practices (e.g., NEC 2020 §517.31 specific-circuit requirements) are best-practice positions in this jurisdiction.
• NFPA 99 / 110 are CMS Conditions of Participation references — non-negotiable cadence.
• The Joint Commission EC.02.05.07 audit alignment included in the contract structure.
• LIM monthly testing: critical compliance item — failure rate on monthly LIM testing is the most-cited deficiency in the carrier audit data.

Worked Example C — Light Industrial: 95,000 SF CNC Machine Shop, Cleveland OH

Inputs given:

• Facility: 95,000 sq ft light-industrial machine shop, 4 production cells with 22 CNC machine tools (5–75 hp each), built 1998, last electrical upgrade 2018
• Service: 3,000 A 480 V delta with separately-derived 208Y/120 V for offices; (1) 750 kVA dry-type transformer for the office derivation
• Equipment: 4 MCCs (one per cell), 28 VFDs (sized 5–100 hp), passive harmonic-mitigation filters on the two largest CNCs, 480 V buck-boost transformer for legacy lathes
• Occupancy: 2 shifts, M–F, 24h on rush orders
• Jurisdiction: Cuyahoga County / City of Cleveland OH, on NEC 2017 (Ohio adopted NEC 2017 in 2018; on schedule to adopt NEC 2023 in 2026 H2)
• NFPA 70B: not adopted by Ohio Building Code as of Q1 2026
• Insurance: Liberty Mutual; carrier policy references NETA MTS testing on protective devices ≥ 600 A annually

Path selected: Light Industrial.

Sample matrix excerpts:

Annual hours estimate: ~110 visit hours/year + ~20 PE/NETA hours amortized.

Compliance flags:

• Ohio on NEC 2017 today; expected to adopt 2023 in H2 2026. Internal Notes recommends using the proposal to position a 2023-readiness assessment as a value-add at adoption.
• OSHA 1910.269 NOT triggered (no utility-owned distribution within scope).
• IEEE 519 referenced for harmonic compliance at the point of common coupling — Liberty Mutual policy references this for facilities ≥ 1,000 A with VFD load.
• NETA MTS-aligned testing on the 3,000 A main is the carrier's hard requirement; the contract structure surfaces it as a separate line item to make insurance-renewal documentation clean.

Worked Example D — Multifamily (Light Commercial): 24-Unit Apartment, Seattle WA

Inputs given:

• Facility: 24-unit walk-up multifamily, 28,000 sq ft, built 2011
• Service: 600 A 208Y/120 V house service + 24 unit meters (apartment-side); 200 A common-area panel with 4 EV chargers (40 A each) added in 2024
• Equipment: 600 A house panel, 4 EV chargers, common-area lighting, emergency lighting (battery-pack only — no generator), fire alarm
• Occupancy: residential 24/7
• Jurisdiction: City of Seattle WA, on NEC 2026 (adopted state-wide effective March 2026)
• NFPA 70B: not adopted

Path selected: Light Commercial.

Sample matrix excerpts:

Annual hours estimate: ~24 visit hours/year. Light Commercial cadence with the EV-charger sub-loop driving the only quarterly cadence item.

Compliance flags:

• Seattle on NEC 2026; arc-flash label assessment-date practice is required (§110.16(B)/(C)).
• No genset; emergency lighting battery-pack monthly test is the only NFPA 110 / 700.12 cadence item.
• Owner-side note: the EV-charger sub-loop is the highest IR-flag risk; the proposal positions a quarterly thermal as a low-cost early-warning on EVSE terminal heating.

Worked Example E — Heavy Commercial: 180,000 SF Cold-Storage Warehouse, Boise ID

Inputs given:

• Facility: 180,000 sq ft cold-storage warehouse with 4 freezer rooms (-20°F) and 2 cooler rooms (+38°F), built 2017
• Service: 2,500 A 480Y/277 V; (1) 1,500 kVA dry-type transformer for office derivation
• Equipment: (6) MCCs serving refrigeration compressors and evaporator fans, 18 VFDs on the larger compressors, defrost-cycle controls, 600 A house panel, 2 EV chargers in the office lot, no genset
• Occupancy: 24/7 (cold storage)
• Jurisdiction: Ada County / City of Boise ID, on NEC 2020 (Idaho adopted NEC 2020 in 2021)
• NFPA 70B: not adopted

Path selected: Heavy Commercial (lifted from the borderline because of the 6-MCC + 18-VFD load profile and the cold-chain criticality).

Sample matrix excerpts:

Annual hours estimate: ~120 visit hours/year + ~16 PE/NETA hours amortized. Cold-chain alarm test is the highest-leverage item — a single defrost-control failure on a freezer room is a six-figure inventory event.

Compliance flags:

• Idaho on NEC 2020 today; do NOT cite 2023/2026-only provisions as required.
• No genset, but cold-chain criticality argues for a backup-power feasibility study as a separate proposal (out of PM scope).
• Most-cited insurance-carrier item on cold-storage facilities is the cold-chain alarm end-to-end test cadence — the proposal positions it as a quarterly carrier-friendly line.

Output ROI Block (template — populate with actual data points)

• Reactive maintenance avg cost-per-event for facility class: typically 4–8× the equivalent PM line-item cost (industry-aggregated; cite carrier data if known)
• Insurance-carrier premium impact: NETA-aligned PM programs typically reduce E&O / property premium by 5–12% (carrier-specific; verify with broker)
• Equipment lifespan: documented PM extends switchgear, transformer, and motor life by 15–30% (NFPA 70B §1.3 rationale; NEMA application data)
• Unplanned-outage avoidance: 60%+ of low-voltage equipment failures are preceded by a thermographic anomaly visible 30–90 days earlier — the quarterly IR is the highest-leverage line item

Anti-Plagiarism Notes

The Path Selection table, frequency-by-path matrix, and the five worked-example scopes are original to this skill but follow standard NFPA 70B / NETA MTS structural conventions; cadence intervals are aggregated industry-wide ranges (NETA MTS-2023 published intervals; NFPA 110 / 99 statutory intervals). NEC and NFPA section references (§110.14, §110.16, §250.50, §408.4, §625, §700.12, NFPA 70B §§9.1-9.4 / §§11.x / §§17.x / §§19.x, NFPA 70E §130.5(G), NFPA 99 §6.3 / §6.4, NFPA 110 §8.4, NFPA 72) are uncopyrightable code citations. NETA MTS section references (§7.2, §7.3, §7.6, §9) are uncopyrightable industry-standard citations. IEEE 43, IEEE 519, IEEE 1188 references are uncopyrightable industry-standard citations. Worked-example facility identifiers ("Class A office, Portland OR"; "312-bed acute-care wing, Indianapolis"; "95,000 SF CNC shop, Cleveland"; "24-unit multifamily, Seattle"; "180,000 SF cold-storage, Boise") are fictional. Real carrier names (Travelers, Liberty Mutual) are uncopyrightable trade names referenced in their actual business sense. Real utility / building-code authority names (CMS, The Joint Commission, Indiana DLI, Ohio Building Code) are uncopyrightable references to the actual public bodies.