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One-on-One Sessions

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Stuck on a code section, need a second set of eyes on a solar design, or preparing for the California General Electrician exam? Book a dedicated 45-minute Zoom session and get direct, professional answers.

  • NEC / NFPA 70 code interpretation
  • NFPA 70E and Cal/OSHA electrical safety questions
  • Solar PV design & commissioning review (IEC 62446-1)
  • Three-phase calculations & load analysis
  • California General Electrician certification exam prep
  • Bluebeam Revu and Revu MAX training, custom tool sets & dashboards
  • As-built and redline drawings, RFI writing, MEP specification review
  • Career & business development guidance
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Hard To Find Code Session

One-on-one consultation with Kristofer Youngstrom

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45 minutes
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Pacific Time
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Code Questions

Common Questions
We Tackle on Calls

These are the kinds of real-world NEC and electrical code questions that come up in sessions. Browse them to get a feel for what a consultation covers — then book a call when you're ready to go deeper.

NEC 2023 Solar PV

What does NEC 690.12 actually require for rapid shutdown on a rooftop PV system?

For PV systems on buildings, 690.12 splits controlled conductors at the array boundary, defined as 1 ft from the array in all directions. Outside the boundary (or more than 3 ft inside the building), conductors must drop to 30 V or less within 30 seconds of initiation. Inside the boundary, use a listed PV hazard control system (PVHCS) or limit conductors to 80 V within 30 seconds, which is where module-level power electronics (MLPEs) come in. The initiation device and the 690.56(C) rapid shutdown labels are separate compliance items.

NEC 690.12 · 690.56 Ask on a call →
NEC 2023 Industrial

How do you properly size an OCPD for a VFD-driven motor under Article 430?

Article 430 Part X treats the drive as power conversion equipment, and the sizing rules differ from a standard motor circuit. Input conductors are sized at 125% of the drive's rated input current per 430.122(A), not the motor nameplate. Output conductors are sized at 125% of the motor FLC from the 430.250 tables. Branch-circuit short-circuit and ground-fault protection follows 430.130, based on motor FLC unless the drive is listed "Suitable for Output Motor Conductor Protection," and it can never exceed the manufacturer's maximum rating.

NEC 430.122 · 430.130 Ask on a call →
Power Systems Industrial

When does a delta-wye transformer require a grounding electrode system on the secondary?

A delta-wye transformer with a bonded neutral (X0) is a separately derived system, so 250.30(A) requires a system bonding jumper and a grounding electrode conductor from the same point. Since the 2020 NEC, the electrode must be the building or structure grounding electrode system, even if it's far from the transformer. You reach it with a GEC sized per 250.66, or with taps to a common GEC per 250.30(A)(6). Common field mistakes: leaving out the GEC entirely, or driving a separate rod instead of connecting to the building system.

NEC 250.30(A)(4)–(6) · 250.66 Ask on a call →
Solar PV IEC Standard

What tests are required by IEC 62446-1 before a grid-connected PV system can be commissioned?

IEC 62446-1 applies to all grid-connected PV systems, not just commercial ones. After inspection, the Category 1 tests are: continuity of protective earthing and bonding, polarity, combiner box test, string open-circuit voltage, string current (short-circuit or operational), functional tests, and DC insulation resistance. Voc confirms module count and wiring, but only a current test reveals a string fault. Clause 4 also requires a documentation package for the customer, and NEC rapid shutdown verification is a separate check.

IEC 62446-1 · Clauses 4–6 Ask on a call →
NEC 2023 Wiring Methods

When can you use EMT vs. RMC in a wet location, and what does the NEC actually say?

EMT (Article 358) is permitted in wet locations. Under 358.10, supports, straps, and screws must be corrosion-resistant, and under 358.42, couplings and connectors must be listed for wet locations (setscrew fittings aren't). EMT can't be used where subject to severe physical damage (358.12). RMC (Article 344) handles severe damage, direct burial, and concrete encasement. If your jurisdiction requires RMC for every outdoor run, that's a local amendment, not the NEC. Know the difference before you pull a permit.

NEC 358.10 · 358.12 · 358.42 Ask on a call →
NEC 2023 Protection

NEC 2023 reorganized the AFCI rules. What changed, and what still confuses installers?

The 2023 NEC reorganized 210.12. The means of protection are now in (A), and the occupancies are split out: dwelling units in (B), dormitory units in (C), and guest rooms, guest suites, and patient sleeping rooms in (D). Dwelling AFCI rules still apply to listed rooms, not every circuit: kitchens, bedrooms, living areas, hallways, closets, laundry areas, and similar spaces. For extensions or modifications under 210.12(E), an outlet branch-circuit AFCI must go at the first receptacle outlet of the existing circuit. Runs of 6 ft or less with no new outlets or devices are exempt.

NEC 210.12(A)–(E) Ask on a call →

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