What indication should be given on the galvanic isolator if it is not ignition protected?

The correct indication on a galvanic isolator that is not ignition protected is "Not Ignition Protected." This label is crucial because it directly communicates specific safety information about the device's compatibility with environments that may pose a risk of ignition.

In marine applications, where ignition protection is vital due to the presence of flammable gases and materials, indicating that a galvanic isolator lacks this protection informs users that there could be a potential hazard if the device is used inappropriately. This warning helps ensure that users take necessary precautions when installing or using the device in sensitive areas, contributing to overall safety.

Other options may suggest warnings or safety statements that don't precisely clarify the specific issue regarding ignition protection. They could lead to misunderstandings about the risks involved, which is why the clear and straightforward label of "Not Ignition Protected" is essential for safe operation and compliance with safety standards.