Skip to content

Solution in case of loss of neutral in an electrical installation

The loss of neutral in an electrical system can occur under various conditions, such as incorrect   connection or damaged cable, transformer issues, switches, circuit breakers, or extreme weather conditions, accidents, or other incidents on the electrical network.

The loss of neutral is a critical situation as it can lead to safety issues, overvoltages, and malfunctions of equipment connected to the electrical network. Electrical installations must be properly designed, maintained, and monitored to avoid such problems.

The technical team at Nyx Hemera Technologies has taken this possibility into account in the development of TLACS, and the system can, to a certain extent, mitigate the drawbacks of neutral loss for the lighting system.

Nyx Hemera Technologies’ Solutions

Once properly installed, TLACS precisely allows for the supervision of the lighting system, but since neutral loss is unpredictable, user safety may be compromised if several luminaires turn off due to neutral loss on the network.

In a 277 VAC three-phase electrical system, the neutral is generally used as a reference for the three phases. If the neutral is lost, there can be several consequences, including:

  • Unbalanced Voltage: Neutral loss can lead to voltage imbalances between phases, affecting the normal operation of electrical equipment.
  • Overvoltages: Overvoltages can occur on unbalanced phases due to neutral loss, potentially damaging equipment connected to the network.
  • Safety Issues: Neutral loss can also create hazardous conditions, as the voltage potential relative to ground may increase on unbalanced phases.
  • Abnormal Equipment Operation: Certain sensitive electronic equipment may not function properly in the absence of a stable neutral.

A key element of TLACS, the local LPC controller installed in each luminaire, controls and powers the LED driver. It was essential for Nyx Hemera Technologies to promptly address issues related to neutral loss to prevent equipment damage and ensure electrical system safety. Appropriate protection devices, such as voltage relays and monitoring devices, can be used to detect and respond to such situations.

Since the LPC supports voltages from 120 to 480 VAC, in the event of neutral loss in a 277-volt environment, the voltage will rise to 480 V. Nyx Hemera Technologies has designed a mechanism that protects the LED driver. The system will not be affected, but an alarm will be raised so that the maintenance team can address the issue accordingly.

For now, this version of the LPC 480 is available on special order.


In conclusion, neutral loss in an electrical system could pose a risk to the proper operation of equipment in some environments. Solutions developed by Nyx Hemera Technologies, such as TLACS and the local LPC controller, provide protection against the consequences of this problem. With appropriate monitoring and response devices, the system can detect neutral loss and take measures to protect equipment. The design of the LPC 480 ensures system stability in neutral loss conditions, providing a reliable solution for clients facing such challenges.