1950's Vintage Wiring Installations Not Inherently Unsafe  Many homes built in the 1950's still have the same wiring and in many instances the same panels which were installed at the time of initial construction. While a home buyer might have concerns regarding the age of the installation, if it is a professional install with limited modifications or additions over time, it can continue to provide many additional years of service.The primary concern with this type of installation is that in most instances it is a two-wire, hot and neutral, system with no ground wire to the switches and receptacles. Additional measures, such as the use of GFCI's/AFCI's and surge suppression devices can usually be added affordably improving the safety of the system. (see previous post regarding GFCIs/AFCIs by clicking here).   The type of circuit wiring found in these systems is readily identifiable by the braided type of exterior sheathing. Newer wiring has a lighter colored non metallic plastic sheath and is commonly called by its manufacturer's name of Romex®. Romex® is generally a hot and a neutral with a bare ground wire bundled into the sheathing A mixture of these two in an installation is typically indicative of some upgrading or additions over time. Most concerns with older wiring typically involve the level of craftsmanship associated with the upgrading. Non professional splicing with electrical tape and cap nuts not in a junction box with a cover is common. (see photo above). Installation of circuit wiring on the surface of a wall or through an interior space without securing in conduit is also fairly common. if you see any of these defects, it is best to have the installation evaluated for correction by a qualified electrician to insure safety. These systems are also often protected by a cartridge type fuse panel with a manual trip lever. Some electricians actually consider this type of installation to be inherently safer than a breaker which can possibly fail in the latched position. When a fuse "burns out" it is not resettable and will require replacement with a new fuse. While inconvenient, it does insure that if the fuse were somehow damaged, it is replaced with a new fuse.So remember, if you are considering purchasing a 1950's vintage home, it is advisable to have the electrical system evaluated by a qualified electrician, or Licensed Home Inspector as part of pre-purchase inspections to determine the current condition of the system and if any corrections or repairs will be required to insure its safe, continued function. However, in most instances, re-wiring of the residence will not be required. |
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