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OhmCert2026
Field Testing & Twin SaaS
🇬🇧 Full UI + PDF + National Standard Mapping: UI + PDF in English. Normative references follow international IEC 60364, BS 7671:2018+A2:2022, IEEE, and NFPA 70E/70B.
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#12LV Switchgear & Motor Control Center (MCC) Checklist

Project Framework (report reference): IEC 60364-4-41Applicable Standard: IEC 61439-1 / NFPA 70B
Module Field Guides, Standard Selection & Tutorials (3)Browse All 93+ Guides →
1 · Field Measurement ProcedureHow to Measure & Test LV Switchgear / MCC on Site: Step-by-Step Field Procedure (IEC 61439-1 / NFPA 70B)2 · Standards & Limit TablesWhich Standard Applies to LV Switchgear / MCC? Acceptance Limits, Annex Tables & Regional Equivalents (IEC 61439-1 / NFPA 70B)3 · OhmCert Tutorial & Case StudyHow to Complete a LV Switchgear / MCC Certificate in OhmCert: Worked Case Study & Troubleshooting

Multi-Asset / Multi-Point Equipment Schedule

Inspect multiple transformers, panels, rooms, motors, or RCDs in this module without overwriting previous assets. Each item receives a permanent QR Sticker UID preserved across annual audits.

Sticker UID: OC-SWIT-9828
Plant & SLD (Auto-SLD)

Standard Limits, Equations & Space Presets

NETA MTS Table 100.18 infrared thermography Delta-T severity classifications, IEC 61439-1 short-circuit breaking capacity verification (Icu >= Ipsc), and NEMA MG-1 phase current balance.

One-Click Normative Presets (Auto-fills Target Limits)

Measured Inputs

Calculated / Evaluated Results

Thermography is graded with the NETA MTS Table 100.18 delta-T criteria; the reference selector switches between comparison with a similar component under the same load and comparison with ambient air.

Pending / Not tested — results stay neutral until valid measured values are entered.

  • Joint Delta T vs Similar Component

    - degC

    Not tested - 1-3 degC: within normal variation. [NETA MTS Table 100.18]

    Pending

  • Survey Load Validity

    - %

    Not tested - enter the measured value. Acceptance: Survey at >= 40% of rated load for a valid thermal comparison [NETA MTS §9 / NFPA 70B]

    Pending

  • Breaking Capacity Adequacy

    -

    Not tested - enter the measured value. Acceptance: Icu >= prospective short circuit current at the panel [IEC 61439-1 §10.11]

    Pending

  • Phase Current Imbalance

    - %

    Not tested - enter the measured value. Acceptance: Imbalance <= 10% on feeders; motor terminals <= 1% voltage unbalance [NEMA MG-1 14.35 / 14.36]

    Pending

Verification Checklist (0 / 18)

Pending

  • 1Assembly Form of Internal Separation (Form 1, 2b, 3b, 4a, 4b) and IP/IK rating intact with zero missing blanking plates [IEC 61439-2]

  • 2Compartment doors, rotary handle defeat mechanisms, and live busbar safety shutters operate smoothly

  • 3Main and distribution busbar insulators/supports clean, crack-free, and cleared of conductive dust

  • 4Busbar splice joints and cable lug terminations torque-verified and marked with tamper-evident lacquer

  • 5Infrared thermography survey completed through IR windows or open covers at >= 40% rated load [NETA MTS Table 100.18]

  • 6Withdrawable ACB / MCCB cassette racking mechanism (Connected / Test / Disconnected) smooth and padlockable

  • 7Contact resistance (Ductor / micro-ohm) measured across main ACB/MCCB poles within OEM micro-ohm limits

  • 8Electronic trip unit (LSIG) settings verified against the approved protection selectivity study

  • 9Mechanical/electrical interlock between Normal Incomer, Standby Generator Incomer, and Bus-Coupler proven

  • 10MCC withdrawable motor starter buckets, contactors, thermal/electronic overload relays, and VFD cooling fans inspected

  • 11Motor feeder Type 2 coordination (fuse/MCP + contactor + overload relay per IEC 60947-4-1) verified

  • 12Control voltage transformers (CPT), miniature fuses, and door-mounted pilot lamps/meters functional

  • 13Main Protective Earth (PE) busbar continuity and hinged door braided copper bonding straps verified (<= 0.1 Ohm)

  • 14Bottom/top cable gland plates non-magnetic (brass/aluminium for single-core cables) and fire-stopped against vermin

  • 15Anti-condensation space heaters, thermostats, and enclosure louvre fan filters clean and operational

  • 16Arc-flash incident energy label, single-line diagram (SLD), and laminated circuit schedule displayed on panel

  • 17Insulating rubber floor mat (IEC 61111 Class 0/2) placed along full front/rear operating corridor

  • 18Minimum working clearance in front of switchboard maintained unobstructed with zero combustible storage

General Notes

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Free plan: 5 of 5 inspections / calculations left this month.