Let's break this down to address both parts of your question

1. Can you use stranded bare copper as a grounding electrode conductor (GEC)?
Yes, you can. The National Electrical Code (NEC) generally permits bare copper wire, whether solid or stranded, to be used as a GEC. The NEC requires specific types of conductor to be used for different situations, and the type must be listed and labled for its intended use.2. Does #1/0 AWG bare copper wire exist? Yes, it exists. Your electrician may be mistaken or have limited local supplier access. #1/0 AWG (also written as 1/0 AWG) bare copper wire is a common size and readily available from electrical supply distributors. However, keep in mind that local availability can vary.

Important Considerations



NEC Requirements

The size of the GEC is determined by the size of your service entrance conductors (the wires bringing power into your building). The NEC has tables (like Table 250.66 in the 2020 NEC) that specify the required GEC size based on the service entrance conductor size. You must consult the NEC or a qualified electrician to determine the correct size for your specific installation.

Protection from Damage

While bare copper is permitted, it needs to be protected from physical damage if exposed. The NEC outlines methods for protection. If the GEC is subject to physical damage, it needs to be in conduit (rigid metal conduit, intermediate metal conduit, electrical metallic tubing, PVC conduit, etc.) or otherwise protected.

Terminations

Ensure that the terminations (connections) at the grounding electrode (ground rod, water pipe, etc.) and the service equipment are appropriately rated for copper and the wire size being used. Listed connectors and clamps are essential.

Local Codes and Regulations

Always check with your local electrical inspector or building department for any local amendments or regulations that may supersede the NEC.

Professional Advice

It's strongly recommended to consult with a qualified and licensed electrician for any electrical work. Grounding is critical for safety, and improper grounding can be dangerous. If your electrician is telling you #1/0 bare copper doesn't exist, it may be a good idea to get a second opinion.

In Summary

#1/0 AWG bare copper grounding wire exists. You can* use it as a GEC, but ONLY if the NEC and local codes allow it for your specific installation based on the size of your service entrance conductors and other factors.

Recommendations


Double-check the NEC

Review NEC Table 250.66 (or the equivalent in your adopted code year) to confirm the correct GEC size for your service entrance conductors.
2.

Discuss with your electrician

Ask your electrician why they believe #1/0 bare copper isn't available. It could be a misunderstanding or a temporary supply issue.3.

Get a second opinion

If you're unsure about your electrician's advice, get a second opinion from another licensed electrician.4.

Consult with local authorities: Check with your local electrical inspector or building department to ensure compliance with all applicable codes and regulations. Flag for review