What is the amp rating for a 4/0 Kearney jumper?

The amp rating for a 4/0 Kearney jumper is accurately identified as 400 amps. This sizing is based on the standard ratings for conductor types and sizes used in electrical applications. A 4/0 AWG (American Wire Gauge) conductor is typically rated for 400 amps when considering copper wire under normal conditions, especially for applications involving power distribution or temporary connections like jumpers.

The rating takes into account various factors such as conductivity, temperature rating, and the application environment. In practical scenarios, this means that the jumper can safely carry a current of up to 400 amps without overheating or causing damage to the insulation or the surrounding equipment, assuming proper installation and ventilation are maintained.

This understanding is crucial for linemen and electrical workers since it ensures safety and efficiency in electrical systems. Knowing the correct amp ratings helps avoid undersizing or oversizing conductors, which could lead to system failures or hazardous conditions.