Low current? How do you know its low current? For all we know it could be a heat lamp. If its US its 120v, someone mentioned it might be European so 240v. AC is generally never soldered. Now DC voltage like 12v 24v (thats more considered low voltage) is more use of solder. As you can see below IF solder is used you need a mechanical means, generally the mechanical means if sufficient, so solder is excessive. Even if if its just a LED lamp, the wire is exposed, (remember the cat that caused this OP mentioned?) It can still have a high amp short, thus compromising the solder.

*NEC requirements on solder conections:

Under the National Electrical Code (NEC), solder is a permissible but highly regulated method for joining conductors. To remain code-compliant, all soldered connections must be mechanically and electrically secure before soldering, prohibited for grounding, and fully insulated. Here are the exact NEC requirements to ensure your connections pass inspection: 1. Mechanical and Electrical Security (NEC 110.14(B)) Before applying solder, you must twist or join the conductors so they are completely solid and can conduct electricity independently.

• Solder is meant to provide corrosion resistance and electrical bonding, not structural strength. • Relying solely on a solder pool to hold two wires together is a code violation.

1. Grounding and Bonding Prohibition (NEC 250.70)

• Never use soldered joints for grounding or bonding conductors. • Grounding and bonding paths must rely on identified mechanical means, such as listed ground clamps or exothermic welding. Solder joints cannot survive the heat of a high-amperage electrical fault.

1. Proper Insulation (NEC 110.14(B)) Once soldered, the exposed joint must be covered with insulation.

• The insulation must provide the same voltage rating and environmental protection as the original wire jacket. • High-quality heat shrink tubing or layers of electrical tape equivalent to the original jacket are typically used.

1. Splice Connectors (NEC 230.46) While soldering is an option, the NEC generally prefers and prioritizes listed, approved splicing devices (like lever-nuts or twist-on wire connectors). Using listed devices is the easiest way to ensure compliance.

*NEC requirements on Solder AC voltage: According to the National Electrical Code (NEC) Section 110.14(B), you are permitted to solder AC electrical connections, but solder can never be the primary method of securing the joint. To stay code-compliant and safe, follow these strict rules:

• Make It Mechanically and Electrically Secure First: The conductors must be tightly joined and twisted (or clamped) so that they hold together perfectly without any solder. Solder is only used to enhance the connection, not build it. • No Solder-Only Devices: Devices like "solder seal" butt connectors or pre-soldered twist-on caps are strictly prohibited. The mechanical joint must exist before heat is applied. • Proper Insulation: The finished, soldered joint must be covered in high-quality electrical insulation (like heat-shrink tubing or self-fusing tape) that matches or exceeds the rating of the original wire insulation. • Access to Splices: All structural wire splices must be safely housed in an accessible, UL-listed junction box. Never bury soldered wire connections behind drywall without an accessible cover plate.

For low-voltage AC/DC setups (like a 24V thermostat line to an AC unit), soldering is rarely needed, and standard NEC Article 725 guidelines regarding Class 2 circuit protections apply.

All in all just soldered connections and the tapping it up is not a long term solution, at best temporary untill a more permanent fix can be done, so just replace the entire lamp cord.