You are correct in your understanding of why a 50 amp range cord uses a smaller conductor for the neutral (and sometimes also for the ground). Here's the breakdown: 2-#6 Conductors

These are the hot (ungrounded) conductors, carrying 120V each, for a total of 240V.

2-#8 Conductors

One is the neutral and the other is the grounding conductor.

Why the Smaller Neutral?

Your reasoning is accurate. The National Electrical Code (NEC) allows for a reduced neutral size on electric ranges and dryers because:1. Unbalanced Load

The neutral primarily carries the unbalanced load. Ranges and dryers primarily use 240V for heating elements. When the load is perfectly balanced (equal loads on both 120V legs), the neutral carries zero current. However, things like oven lights, timers, and smaller heating elements operate at 120V, creating an imbalance that the neutral must carry.2.

Demand Factor

Electrical codes recognize that appliances like ranges don't continuously draw their maximum rated current. There's a "demand factor" applied, meaning the actual continuous current is likely less than the full 50 amps. This is due to thermostatic cycling of the heating elements and the duty cycle of the appliance.3.

NEC allowances

The NEC contains tables and sections specifically allowing for reduced neutral sizes in range circuits. These are based on decades of experience and data.4.

Grounding Conductor Size

The grounding conductor can also be smaller than the ungrounded conductors based on the size of the circuit overcurrent protective device (in this case, the 50A breaker).

Important Considerations



Local Codes

Always verify that your local electrical codes allow for reduced neutral sizes. Some jurisdictions may have stricter rules.

Manufacturer's Instructions

Follow the appliance manufacturer's installation instructions.

Safety

When wiring any electrical circuit, ensure the power is OFF and use proper safety precautions. If you are unsure about any part of the process, consult a qualified electrician.

New installations (2020 NEC and later): A neutral and ground cannot be bonded at the appliance. The grounding conductor must be run back to the main service panel and connected to the grounding bus bar.In summary, the smaller neutral and grounding conductors in a range cord are permitted due to the anticipated lower current draw on the neutral, demand factors, and provisions within the NEC. Flag for review