Okay, based on your description and the limited text, here's a breakdown and what the inspector likely wants

What you likely have:
Age

1960s era wiring. This is important because codes and materials changed significantly.

Conductor

#6 Stranded Copper. #6 copper is rated for 55 amps at 60°C, 70 amps at 75°C, and 75 amps at 90°C.

Insulation

The "fabric and tar" sheathing points to an older type of insulation. This is most likely

rubber-insulated cable with a braided fabric covering impregnated with asphalt or tar. This was common in the 1960s and earlier. Configuration

3-wire bundle. This almost certainly means it's a cable with two current carrying conductors and a neutral.

Protection

50A Fuses. This is a crucial point that might be where the inspector has concern.

Why the Inspector Wants More Information

The inspector is very likely concerned because:1.

Overcurrent Protection

#6 copper wire is rated for between 55A and 75A depending on its temperature rating. The temperature rating is dependent on the insulation type, and it is very unlikely that old wiring like this has a 75A rating. It is more likely that this wire is rated to 55A or less. As such, the 50A fuses may not be sufficient to properly protect the wire.2.

Insulation Degradation

The age and type of insulation are red flags. The tar-impregnated fabric can become brittle, cracked, and lose its insulating properties over time. This can lead to:

Short circuits

Exposed conductors touching each other.

Ground faults

Current leaking to grounded metal parts.

Fire hazard

Overheating due to insulation breakdown.3.

Amperage Rating Concerns

Older insulation types often had lower temperature ratings than modern PVC or THHN insulation. This would limit the allowable ampacity of the #6 wire. The inspector wants to verify the insulation type to ensure the 50A fuses aren't exceeding the wire's safe carrying capacity.4.

Unknown Origin/Application

Without knowing the full marking on the cable, the inspector doesn't know its intended use. Was it rated for direct burial? Wet locations? Specific appliances? This information is vital for code compliance.

What You Need to Do (to give the Inspector)


Examine the Cable Closely (Carefully)

Try to find any other markings, even faint ones. Use a magnifying glass and good lighting. Look for anything that resembles a manufacturer's name, a cable type designation (e.g., "Type R," "Type RH," "Type USE"), or a voltage rating.

Very Carefully examine the insulation. Is it cracked? Brittle? Does it crumble easily? Does it smell burnt or acrid? (Do this with the power OFF, of course.) Assess its Physical Condition

Look for signs of damage, rodent bites, or previous repairs.2.

Document Everything

Take very clear, well-lit photos of the cable, any markings, and its overall condition. Write down all the details you can gather about the cable's location, the circuit it serves, and the loads connected to it.3.

Research (If Possible)

Try searching online for information on old wiring types and insulation materials from the 1960s. Knowing potential cable types will allow you to determine its temperature rating.4.

Consult a Qualified Electrician



This is highly recommended. A licensed electrician with experience in older homes can: Accurately identify the cable type. Assess the condition of the wiring and insulation. Determine if the 50A fuse is appropriate (or if it needs to be downsized). Recommend necessary repairs or upgrades.* Communicate with the inspector if necessary.

In summary, the inspector is likely concerned about safety. This old wiring, while potentially still functional, presents risks due to its age, insulation type, and potentially the overcurrent protection. Provide as much information as possible, and strongly consider having a qualified electrician evaluate the wiring. Flag for review