# Sec. 9-108.01. Same; Article 408 — Switchboards and Panelboards

Codified through Bill No. CB-018-2026, adopted May 12, 2026, effective July 24, 2026. Source: Municode, Supplement 2026 Update 2. Editorial notes and legislative history omitted.

## Sec. 9-108.01. Same; Article 408 — Switchboards and Panelboards

Prince George's County, Md., Code § 9-108.01 (2026)

(a) The following amendments, additions, and/or deletions are made to Article 408 of the National Electrical Code:

  (1) All commercially owned occupancies including dwelling units having electrical equipment with a capacity of eight hundred (800) amperes or larger, shall undergo maintenance, cleaning and inspection as described by the manufacturer: every three (3) years by a master electrician licensed by Prince George's County. The master electrician must promptly prepare a written maintenance report identifying the equipment inspected and cleaned including any conditions to be corrected and or repaired. A copy of the report shall be delivered to the owner within in 10 days of the inspection. Any deficiencies noted thereon must be corrected or repaired. Moreover, a copy of the "Maintenance/Cleaning Inspection Report shall be made available to the Department of Permitting and Inspections upon request. If such maintenance or cleaning requires a coordinated shut down with the servicing utility company, an electrical permit shall be required. The maintenance and cleaning includes but is not limited to the following:

    (a) Vacuum entire interior of electrical equipment;

    (b) Clean busbars and contacts with a suitable nonconductive solvent;

    (c) Lubricate and exercise all moving mechanisms; apply anti-oxidizing agents as warranted;

    (d) Check all conductors for abrasions;

    (e) Busbars and busbar connections shall be subjected to thermographic testing, if corrective action is warranted, repair shall be made in accordance with recommended manufacturer specifications;

    (f) Replace worn, damaged, or deteriorating components; and

    (g) Test ground-fault protective device.

    (h) Testing and cleaning records shall be kept and made available upon request and proper antioxidizing agents shall be used after each cleaning.

  (2) On all new and renovated installations requiring service and distribution electrical equipment, Electrical Contractor shall provide a Letter from utility company stating the short circuit available interrupting current (SC AIC) rating required for the service equipment to inspector at the TPF inspection. Upon final inspection of all electrical work the electrical contractor shall provide letter certification of electrical connection tightening per manufacturer requirements and recommendations.