Voltage Problem Loggers
Use this guide when you need to prove whether a supply voltage problem is causing equipment faults, high energy use, nuisance trips, resets, poor performance or voltage optimisation concerns.
Voltage problems are often intermittent. A spot reading may look normal, while the useful proof is hidden in the minimum, maximum and average voltage recorded over hours, days or weeks.
When to investigate voltage
- Equipment trips, resets, locks out or behaves unpredictably.
- Lights flicker, motors run hot, UPS systems transfer unexpectedly or controls reset.
- You suspect high voltage, low voltage, voltage imbalance or supply variation.
- You need proof before contacting a supplier, landlord, facilities team or contractor.
- You want to check voltage before and after voltage optimisation work.
What to measure
- Live-neutral, phase-phase or three-phase voltage over time.
- Minimum, maximum and average voltage.
- Voltage dips, rises, interruptions and long-term variation.
- Where relevant, current and load behaviour at the same time as voltage.
Recommended loggers
EC-7VAR-RS: Electrocorder EC-7VAR-RS Three Phase Voltage, Current & Power Factor Recorder
Use when voltage needs to be analysed alongside current, power factor, load and energy behaviour.
EC-3V: Electrocorder EC-3V Three Phase Voltage Recorder
Use for three-phase voltage recording where you need to compare phases over time.
SL-3V: Electrocorder SL-3V Compact Three Phase Voltage Recorder
Use where a compact three-phase voltage recorder is easier to install or leave in place.
EC-2V: Electrocorder EC-2V Voltage Logger
Use for single-phase live-neutral and earth-neutral voltage comparison.
EC-1V: Electrocorder EC-1V (Mailable) Voltage Recorder
Use for simple single-phase voltage recording, including customer supply checks.
LS-1V: Electrocorder LS-1V Interruption Voltage Logger
Use when the key question is whether voltage disappeared, and exactly when interruptions occurred.
Quick comparison
Use this table as a quick route from the investigation type to the most likely logger.
| Product | Best for | Measures | Choose when |
|---|---|---|---|
| Voltage investigations where current, load, power factor or energy may also explain the issue. | Three-phase voltage, current, power, energy and power factor. | Use when voltage symptoms may be linked to load behaviour. | |
| Three-phase voltage investigations at distribution boards or supply points. | Three-phase voltage over time. | Use where voltage is the main proof required. | |
| Compact three-phase voltage logging. | Three-phase voltage over time. | Use when a smaller voltage-only logger is preferred. | |
| Single-phase voltage problems where live-neutral and earth-neutral comparison may help. | Two voltage channels. | Use for single-phase supply checks and neutral-related investigations. | |
| Simple voltage level or interruption timing proof. | Single-channel voltage or interruption events. | Use when the question is mainly whether supply was present and when it changed. |
How to choose
- Choose EC-7VAR-RS when voltage needs to be understood alongside current, power factor, load and energy.
- Choose EC-3V or SL-3V for three-phase voltage monitoring.
- Choose EC-2V when earth-neutral comparison may help diagnose wiring or supply behaviour.
- Start with EC-1V for straightforward single-phase voltage checks.
- Choose LS-1V when interruption timing matters more than detailed voltage level analysis.
Useful reading
- Voltage Optimisation
- Machines Tripping or Resetting
- Normal Daily Voltage Variations
- High Consumer Voltage
- Machines or Equipment Resetting
- Products by Use: voltage problems
Need help choosing?
If you are not sure which voltage logger is best for the site, contact us with the supply type, symptoms and what you are trying to prove.