State ComparisonUpdated Apr 2026

Maryland vs Pennsylvania Electrical Code

Maryland and Pennsylvania score equally at 67/100 (Permissive). Both states enforce NEC 2020.
Maryland67/100
Pennsylvania67/100

Side-by-side comparison

FactorMarylandPennsylvania
NEC editionNEC 2020NEC 2020
Compliance score67/100 (Permissive)67/100 (Permissive)
Electrician licenseRequiredRequired
License nameMaster Electrician LicenseElectrical License (varies by jurisdiction)
Permits requiredYesYes
State amendmentsNoNo
Homeowner exemptYesYes

Maryland and Pennsylvania have very similar electrical code environments. The main differences will be at the city and county level rather than statewide policy.

Licensing requirements

Maryland

Maryland requires a Master Electrician License through the Maryland Board of Master Electricians. Homeowners are exempt for work on their own primary residence.

Pennsylvania

Pennsylvania requires a Electrical License (varies by jurisdiction) through the Local jurisdictions (no statewide license). Homeowners are exempt for work on their own primary residence.

Wire sizing is identical. NEC Table 310.16 ampacity values have not changed since NEC 2017. Whether you are wiring in Maryland or Pennsylvania, a 20A circuit uses 12 AWG copper and a 30A circuit uses 10 AWG copper. The differences between states are in code enforcement, not in the wire sizing itself.

GFCI requirement differences

Both states enforce NEC 2020, so GFCI requirements are identical. See our kitchen GFCI guide and bathroom GFCI guide for detailed room-by-room requirements.

Frequently asked questions

Which state has stricter electrical codes, Maryland or Pennsylvania?

Both states score equally at 67/100. The score reflects NEC edition recency, licensing requirements, permit enforcement, and state amendments.

Is my electrician license from Maryland valid in Pennsylvania?

Electrician licenses are generally not transferable between states. If you hold a license in Maryland, you will typically need to apply separately in Pennsylvania. Some states offer reciprocity agreements, but these vary. Contact the licensing authority in Pennsylvania directly for requirements.

Is the wire size different in Maryland vs Pennsylvania?

No. Wire sizing per NEC Table 310.16 is identical regardless of which NEC edition a state enforces. A 20A circuit requires 12 AWG copper in both Maryland and Pennsylvania. The ampacity values have not changed since NEC 2017.

Do both Maryland and Pennsylvania require electrical permits?

Both states require electrical permits for most work. Common permit-required projects in both states include new circuits, panel upgrades, service changes, and EV charger installations.

Maryland electrical codeScore 67/100, NEC 2020, full licensing detailsPennsylvania electrical codeScore 67/100, NEC 2020, full licensing detailsAll 50 statesNEC adoption, compliance scores, and state rankings
Requirements vary by state. NEC edition, licensing, permits, and GFCI rules differ by jurisdiction. Check your state or pick it below for personalized info across WireRef.
Important: For reference only. Not a substitute for a licensed electrician. Electrical work can cause serious injury, death, fire, or property damage if performed incorrectly. Always hire a licensed electrician for electrical work, especially for service upgrades, panel work, and 240V circuits. Values are derived from NFPA 70 (NEC) for educational purposes. Always verify against your locally adopted NEC edition and amendments - local jurisdictions may enforce stricter requirements. WireRef provides reference information only and is not responsible for work performed based on this content. NEC® is a registered trademark of the National Fire Protection Association. Free NEC access via NFPA · OSHA Electrical Safety · Terms of use.

NEC 2023 references verified April 2026