Jul
Summary:
A proactive Electrical Maintenance Program (EMP) helps facility teams understand how electrical systems are performing, where problems are developing, and what action to take next. Power quality testing can be a key part of this work because it turns electrical events into measurable data.
A proactive EMP depends on measured conditions
NFPA 70B compliance requires facilities to have a formal, documented Electrical Maintenance Program (EMP) that includes preventive inspections, condition-based maintenance, field data documentation, and corrective action records.
While visual inspections, thermal imaging, and insulation resistance testing all play important roles in a compliant, proactive EMP, they don’t show how voltage, current, harmonics, transients, and other electrical events behave over time. Power quality testing helps fill this gap.
What power quality testing can reveal
The average facility may experience 100 electrical disturbances or transients per month, and many are not seen or reported before they contribute to downtime, shortened equipment life, or safety and insurance risk.
Many of these electrical problems do not announce themselves with obvious signs. For instance, a panel may look fine or a process line may restart after a nuisance trip. But the underlying issue may still be there.
Power quality testing can help identify conditions such as:
- Voltage sags and spikes
- Transients
- Harmonics
- Flicker
- Voltage unbalance
- Overloaded circuits
- Intermittent electrical events
- Load-related disturbances
These conditions can shorten equipment life, interrupt production, affect sensitive electronics, or create repeat failures that are hard to explain without data.
From scheduled maintenance to condition-based maintenance
A fixed maintenance schedule is helpful and gives the maintenance technicians structure. However, a proactive EMP should also account for actual system conditions.
Condition-based maintenance uses observations and measurements to decide where attention is needed most. Instead of treating every asset the same way, the techs can focus on equipment showing signs of stress.
For example, if:
- Harmonics are increasing, the team may need to look at nonlinear loads, drives, UPS systems, or capacitor banks.
- Voltage sags keep appearing, they can compare event timing with equipment starts, process changes, or utility-side events.
- Transients are recurring, the team can review switching events, protective devices, grounding, or equipment operation.
- Unbalance is present, they can evaluate load distribution and possible equipment stress.
This makes maintenance planning more focused. It also gives teams better records when they need to explain why a repair, upgrade, or monitoring investment is needed.
Make power quality testing part of the program
Power quality testing should be a key part of a proactive EMP because it helps maintenance teams see what routine inspections may miss. It also helps them document conditions, compare trends, and act before small issues become larger failures.
A practical starting point is to ask:
- Which systems are most important to uptime and safety?
- Which equipment has a history of nuisance trips or failures?
- Where would better data reduce troubleshooting time?
- Which records would help during review, repair planning, or budget approval?
- Where would continuous monitoring provide better insight than spot testing?
The answers can help your team decide where to begin.
Choosing PQ tools for your EMP
Power quality testing should fit the way your facility’s team works. Portable PQ analyzers are useful for field troubleshooting, temporary monitoring, and investigating recurring problems. Permanent systems are useful when continuous monitoring, reporting, and long-term trend data are needed.
Dranetz offers both portable and fixed power quality monitoring options, as well as energy instruments, meters, and software for monitoring needs.
Ready to strengthen your EMP?
If your team is building or updating an Electrical Maintenance Program, Dranetz and the GMC Instruments brands can help with the electrical testing side of the work.
Learn more about NFPA 70B compliance and the electrical testing solutions available to support a proactive maintenance strategy.
FAQs
What is power quality testing?
Power quality testing measures electrical conditions such as voltage, current, harmonics, transients, flicker, and unbalance. These measurements help maintenance teams identify events that may affect equipment performance, reliability, or safety.
How does power quality testing support an EMP?
Power quality testing supports an Electrical Maintenance Program by providing field data, trend records, event captures, and measured evidence for troubleshooting and corrective action planning.
When should a facility use power quality testing?
A facility should use power quality testing when equipment trips, failures, voltage problems, harmonics, or unexplained electrical events occur. It is also useful for condition-based maintenance and long-term monitoring of mission-critical systems.