What can be inferred from consistent low readings in insulation resistance tests?

Consistent low readings in insulation resistance tests indicate that there may be underlying systemic issues within the installation that require attention. Low insulation resistance often suggests that there is a pathway for current leakage, which can compromise safety and functionality. This could stem from various issues such as moisture intrusion, deterioration of insulation materials, or accidental contact with conductive surfaces.

In contrast, perfect installation would imply no issues whatsoever, which is not supported by low readings. High efficiency of circuits typically relates to the performance and energy consumption of the system rather than the condition of the insulation. Additionally, normal operation would suggest adequate insulation resistance; consistent low readings contradict this notion as they indicate a potential fault that could lead to equipment failures or electrical hazards. Therefore, the best inference from consistently low insulation resistance readings is the likelihood of systemic issues that should be investigated and rectified for the safety and reliability of the installation.