Top 10 Most Common Electrical Issues
- Improper wire junctions – where two or more wires meet, this wire junction is required to be wire-nutted and enclosed in an approved junction box. This is required for several safety reasons, namely to help limit a shock hazard but also to help contain a possible fire at this connection.
2. Improper wiring terminations – where a wire stops (terminates), as mentioned above, it should also be wire-nutted and enclosed in an approved junction box. Even if the wire is no longer in service or live (energized), years down the road someone could connect something on the other side of the home and all of a sudden this unterminated wire can become energized, now presenting a shock hazard. It is best to be pro-active and properly protect the wire now. Same idea as ‘improper wire junctions’ above.
3. Improperly Buried Wiring – To safely bury wiring underground, only wiring approved for direct burial use, such as a rigid conduit should be used. Imagine burying household Romex wiring in your back yard, forgetting it, and hitting it with your shovel next spring when planting flowers. Ouch! Hitting conduit with your shovel will alert you to the fact of underground wiring, and also prevent you from slicing through the wiring and getting the shock of your life.
4. Ungrounded receptacles – in the early 1960s, electrical codes changed to introduce 3 wire grounded receptacles to residential homes. The grounding conductor (the round pin in a 3 prong receptacle) is designed to give electricity a safe place to discharge should something go wrong with an appliance or in case of a nearby lighting strike. Homes from before 1960 were not wired with 3 conductor wire, but rather were wired with only a 2 conductor cable. Often, someone will replace an old 2 wire receptacle with a new 3 wire receptacle. If the wiring to the receptacle is not replaced and grounded properly, the result is an ungrounded 3 prong receptacle. Just by looking at a 3 prong receptacle, one normally assumes it is grounded. If ungrounded 3 prong receptacles are present, there are several ways of correcting the issue. The receptacle can be changed back to a 2 wire type, the wiring to the 3 prong receptacle can be replaced with new Romex and grounded, or a Ground Fault Circuit Interrupter (GFCI) receptacle can be used (assuming it is labeled ‘No Equipment Ground’).
Is the below receptacle grounded? You can't tell without a proper testing device. Just because the receptacle has 3 prongs does not guarantee that there is a proper grounding conductor connected to it even if the receptacle is live. Many home owners make this assumption, sometimes incorrectly.
5. Knob & Tube Wiring – this type of wiring is the original type used in homes from before 1950. The conductors for this type of wiring are separated, unlike later sheathed cable that had the insulated conductors wrapped together.
Knob and tube wiring needs to be closely evaluated by a licensed and qualified electrician. Because of the age and lack of capacity, it is generally inadequate for today's usage. Old knob and tube wiring tends to be brittle which can lead to arcing and fires. Also, junctions in knob and tube wiring tend to not consistent with today's wiring and safety standards. Often, knob and tube junctions are found only soldered or taped which is not sufficient per today’s standards.
Also, some insurance companies will not insure homes with knob and tube wiring. A thorough inspection of the home's active knob and tube wiring by a licensed electrician is recommended, although replacement of active knob and tube wiring is most often wise for fire safety reasons.
6. Missing Wire Bushings/Clamps – wherever wiring enters a metal junction box, metal appliance, etc., the wiring is required to have wire clamps to protect the wiring from mechanical damage or abrasion. For example, the vibration of a garbage disposal can slowly slice through wire insulation. A shock hazard can occur once it gets to the live conductors. The wire clamp holds the wiring in place so it can’t touch the metal chassis or junction box.
7. Extension Cords – We all use them occasionally, but extension cords are not meant to be used as permanent wiring. Often, people use extension cords to power things like outside fountains, garage door openers, and lighting, but extension cords are meant for temporary means; not to be used in place of what should be permanent wiring. Should power be needed where there is not currently an accessible receptacle, a licensed electrician can often install a new receptacle where needed.
The National Electric Code (NEC) rule regarding maximum distance allowed between receptacles comes from the fact that they are trying to greatly minimize the need for extension cords. Since most lamps come with 6’ cords, if the maximum spacing allowed between receptacles is 12’, one should not need to use an extension cord to power a lamp.
8. Double Tapped & Double Lugged Circuit Breakers – circuit breakers are normally designed to accept one (1) wire safely. Some brands of circuit breakers (such as some made by Square D) are designed to accept two wires since they have a special clip for each wire. Terminals for more than one wire must be specifically identified for this purpose, either within the equipment instructions or on the terminal itself.
Generally, the term ‘double tapping’ means having extra wires connected to the location where the main service cable connects at the main breaker. Double tapped wires are often lacking over-current protection which can lead to overheating and fire. Also, most circuit breaker panel manufacturers have specific torque and wire size requirements to safely allow for only the main electrical service cable.
The term ‘double lugging’ is similar but applies to individual branch circuit breakers. If only one screw exists to accept a wire, that normally means only one wire should be connected at that breaker. Connecting more than the allowed number of wires to a circuit breaker can overdraw the circuit and can also prevent either wire from being properly secured at the breaker. Loose wire connections can lead to arcing and fire. Some correction methods (depending upon the panel) include installing additional breakers or installing an auxiliary subpanel.
9. Improperly Wired Receptacles – Electrical receptacles are designed to have specific wires at specific terminals. A polarized receptacle (one with a longer vertical blade than the other blade) will allow a polarized plug to be fit into it in only one direction. The small blade (when installed properly) is connected to the hot (black) wire. The larger blade (again, when installed properly) is connected to the neutral or grounded (white) wire. The round pin is connected to the bare (grounding) wire. Circuit testers are sold at hardware stores which can identify improperly wired receptacles.
When the hot and neutral wires are reversed, the issue is called reverse polarity and can be a shock hazard. In most circumstances, repair is fairly easy and not time consuming, but should be performed by a licensed electrician.
If the hot and ground (bare) wires are reversed (Yes, I’ve seen it happen!), it is even more of a serious safety issue and should be addressed immediately by a licensed electrician. It would also be wise NOT to use this receptacle until it is repaired.
10. Non-Functional GFCI Protection – Ground Fault Circuit Interrupters (GFCI) can be in the form of a GFCI receptacle or a GFCI circuit breaker. GFCI protection is now required (for new construction) in areas where electricity and water can potentially meet. At different points in time since 1973, GFCI protection requirements have added more locations around the home. Currently, for new construction, GFCI protection is required in bathrooms, unfinished basements, garages, exterior receptacles, and most kitchen receptacles. A GFCI is designed to monitor the amount of current going into the receptacle through one wire versus the amount of current coming back out the other wire. If a lower amount is coming out than what is going in, it assumes the difference must be shocking someone and should trip. For example, 5 Amps going in one wire but only 4 Amps coming back out the other wire. The missing 1 Amp must be shocking someone and ‘POP!’ the GFCI trips.
When a GFCI receptacle ‘trips’, the little “TEST” button pops out and shuts down the circuit. When a GFCI circuit breaker ‘trips’, the breaker handle goes from the ON position to a middle position. GFCI circuit breakers also have a ‘TEST’ button.
A problem that is not uncommon with GFCI protection it that is simply stops protecting. Should a GFCI not trip when the ‘TEST’ button is pressed or the device not reset, it is best to replace the GFCI protection device. These are inexpensive but a very good safety device. GFCI receptacles and breaker should be tested using their TEST buttons monthly; this is normally the only way a faulty GFCI will be found. Just because whatever is plugged into the GFCI is powered doesn't mean the GFCI will probably trip when it needs to. Most home owners never test their GFCI devices.
You may also find my related article called the Top 10 Most Common Plumbing Issues helpful.
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© 2018 Matthew Steger
Matthew Steger, owner/inspector of WIN Home Inspection, is a Certified Level 1 Infrared Thermographer, an ASHI Certified Inspector (ACI), an electrical engineer, and a US Dept. of Energy Home Energy Score Assessor. He can be reached at: 717-361-9467 or firstname.lastname@example.org.
WIN Home Inspection has provided a wide array of home inspection services in the Lancaster, PA area since 2002. This article was authored by Matthew Steger, ACI - owner of WIN Home Inspection in Lancaster, PA. No article, or portion thereof, may be reproduced or copied without prior written consent of Matthew Steger.