Which equipment must be connected close to where an ungrounded system receives its supply?

Ground detection sensing equipment must be connected close to where an ungrounded system receives its supply to ensure the safety and reliability of the electrical system. This type of equipment is specifically designed to monitor the insulation resistance between the ungrounded conductors and ground. By detecting any potential faults or insulation failures, it helps prevent dangerous conditions that could arise from an ungrounded system, such as electric shocks or equipment damage.

Proper placement of ground detection sensing equipment allows for immediate monitoring and reaction to any electrical irregularities, ultimately enhancing the safety of the system. In contrast, emergency power equipment and voltage stabilizers, while valuable for specific functions, do not serve this critical role in fault detection and system monitoring. Thus, they do not need to be positioned near the point of supply of an ungrounded system as ground detection sensing equipment does.