From a grounding bar to bonding bushings, the smallest bonding jumpers to be installed in a 600-amp service are which size AWG?

In a 600-amp service, the requirement for bonding jumpers is governed by the National Electrical Code (NEC), which provides specifications to ensure safety and effectiveness in electrical systems. For bonding jumpers, the NEC specifies that they need to be appropriately sized to ensure adequate conductivity and safety for fault currents.

The correct choice indicates that a size 2 AWG bonding jumper is adequate for a service rated up to 600 amps. This size provides a sufficient cross-sectional area to handle the maximum fault currents that might occur while also being compliant with NEC requirements related to bonding and grounding, ensuring that any potential fault is effectively cleared.

Using this size for the bonding jumpers helps maintain a low-resistance path to ground, which is essential for protecting equipment and ensuring safety during electrical faults. This sizing ensures that any potential voltage rise is kept within safe limits, thereby providing necessary protection to both personnel and equipment.

In contrast, larger sizes such as 1/0, 3/0, and 2/0 would not be necessary for this specific application as they exceed the minimum requirement set by the NEC for bonding jumpers in a 600-amp service. While it's important to ensure adequate sizing for safety, oversizing without necessity could lead to