Quick answer: NFPA 70B became a standard in 2023, replacing its earlier status as a recommended practice. It calls for a documented electrical maintenance program built on equipment condition assessments, with maintenance intervals set by each asset's condition, criticality, and environment. For Charleston-area facilities, heat, humidity, and salt air make condition-based maintenance and infrared thermography especially valuable.
The Charleston region's industrial base spans manufacturing, aerospace and automotive suppliers, distribution centers, and port-related logistics. In every one of these facilities, unplanned electrical downtime is expensive. A structured maintenance program is the most reliable way to prevent it.
What changed with NFPA 70B
NFPA 70B, which covers electrical equipment maintenance, was reissued in 2023 as a standard with mandatory language instead of advisory recommendations, and a 2026 edition has since been published. The core expectation is an Electrical Maintenance Program (EMP): a documented program with defined responsibilities rather than ad hoc repairs.
Key elements of the approach include:
- Equipment condition assessments that consider physical condition, criticality, and operating environment
- Maintenance intervals set by that assessment, with manufacturer instructions taking precedence where they exist
- Periodic review of engineering studies such as short-circuit, coordination, and arc-flash studies, generally at least every five years and after significant system changes
Is NFPA 70B legally required?
NFPA 70B becomes binding for a facility when a jurisdiction adopts it, a regulation incorporates it, or a contract or insurer requires it. Federal OSHA has not adopted it as an OSHA standard, but consensus standards can be used as evidence of recognized hazards and feasible safeguards. Many insurers and corporate risk programs reference it, so it is quickly becoming the baseline for what a responsible maintenance program looks like.
Why the Lowcountry environment matters
Condition-based maintenance means environment directly affects intervals. Charleston-area facilities face:
- Heat and humidity that stress equipment and accelerate insulation aging
- Salt air near the harbor and coast that corrodes terminations and enclosures; see our coastal corrosion guide
- Storm exposure, including surges, flooding, and extended outages
- Dust and debris in warehouses and manufacturing areas that settles on equipment
Equipment in harsh conditions typically warrants shorter intervals than the same equipment in a clean, climate-controlled room.
Infrared thermography: find problems while equipment runs
Infrared (IR) scanning detects abnormal heat at connections, breakers, and components while equipment is energized and under load. Loose or corroded connections, overloaded conductors, and failing components show up as hot spots long before they fail. Findings are prioritized and repaired during planned shutdowns instead of during an unplanned outage. IR scanning must be performed by qualified personnel following electrical safety practices.
Building a practical EMP
- Inventory and single-line documentation. Know what equipment you have and how power flows through the facility.
- Criticality ranking. Identify which assets would stop production or create safety risks if they failed.
- Condition assessment. Establish a baseline for each asset.
- Scheduled tasks. Combine visual inspections, IR scanning, cleaning, tightening, and testing at intervals matched to condition and criticality.
- Planned shutdowns. Coordinate de-energized maintenance with production schedules.
- Records and follow-up. Track findings, corrective actions, and trends over time.
- Spare parts strategy. Identify critical spares and long-lead components before they are needed.
Power quality and motor systems
Variable frequency drives, large motors, and sensitive controls can be affected by power quality issues such as harmonics, voltage sags, and transients. Power quality monitoring, proper grounding and bonding, and surge protection help protect production equipment.
Frequently asked questions
Is NFPA 70B mandatory for industrial facilities?
It is written as a mandatory standard but binds a facility only when adopted by a jurisdiction, incorporated into regulation, or required by a contract or insurer. Many organizations follow it as the benchmark for responsible electrical maintenance.
How often should electrical equipment be maintained under NFPA 70B?
Intervals are based on each asset's condition, criticality, and environment, with manufacturer instructions taking precedence where they exist. Equipment in harsh coastal or dusty environments generally needs more frequent attention.
What does infrared thermography find?
Abnormal heat at loose or corroded connections, overloaded conductors, unbalanced loads, and failing components, all while the equipment is running.
How often should an arc-flash study be reviewed?
Generally at least every five years, and whenever significant changes are made to the electrical system.
Copperhead supports industrial facilities across the Charleston region with service, maintenance, and construction. Request an estimate or visit our industrial page.