Okay, let's break down the code compliance of your conduit installation. This requires considering several factors

1. Ampacity of #6 THHN:
Standard THHN in a wet location is typically rated for 55 amps at 90°C (194°F). However, if you have a dry location THHN, its normally rated for 75 amps. However, we must consider the temperature ratings on all the equipment2. Ampacity Adjustment for the number of conductors



Derating for Number of Conductors

30 current-carrying conductors in a conduit requires ampacity derating. According to NEC Table 310.15(C)(1), we will derate to 50%. Ampacity adjustment is (55 amps)(.50)= 27.5 amps. We will round down to 25 amps

3. Termination Temperature

According to NEC article 110.14(C), you must consider the termination temperature of all the equipment. In this case, the weakest link is the 60-degree terminal rating.

4. Ambient Temperature Correction



Ambient Temperature Adjustment

You've provided local ambient temperatures. NEC Table 310.15(B)(1) provides temperature correction factors. To use this, you need to know the temperature rating of your conductor (THHN is often rated for 90°C). You'll find a correction factor based on your highest expected ambient temperature.Let's assume, for example, your highest ambient temperature is 41-45°C (106-113°F). If the wire is rated for 90-degree C (194 F) then there will be no adjustment

Summary and Code Compliance


Conductor Ampacity

The 6 AWG THHN would normally be rated for 55amps.2.

Derating for number of Conductors

30 current-carrying conductors required a 50% derating factor. This lowers the ampacity to 27.5amps.
3.

Termination temperature. Since the termination temperature is rated for 60-degree C, the 6 AWG conductor is rated for 25amps.

Based on the above information, the installation is not compliant with codeImportant Considerations and Recommendations



Consult a Licensed Electrician

This analysis is for informational purposes only and should not be considered a substitute for professional advice. A licensed electrician can accurately assess your specific situation, perform the necessary calculations, and ensure full code compliance.

Overcurrent Protection

The 30-amp breaker is oversized for the adjusted ampacity of the conductors. You will need to reduce the breaker size to 25 amps.

Disclaimer: I am an AI chatbot and cannot provide definitive electrical code interpretations. This information is for general guidance only. Always consult the NEC, your local electrical codes, and a qualified electrician for accurate and safe installations. Flag for review