While you’re probably more focused on maintain holiday cheer, you should also focus on safety in regards to your home’s electrical system. An electrical safety inspection in Manassas may be the single-most important thing you do this season, as a single inspection from a professional can lower the risk of electrical shocks and residential fires.

An electric conduit is electrical tubing used for protection and routing of electrical wiring. They can be made from a variety of materials, such as: plastic, metal, fiber and fired clay, all depending on the purpose it is being used for. It is generally installed by electricians at the electrical equipment’s installation site. The regulations governing the conduits’ use, form and installation details are specified by the US National Electrical Code (NEC).

Conduit is used as a general term to describe any system that contains electrical conductors. The conduit systems are installed for the following reasons:

To operate as pull outlets for the conductors that are being installed Make 90° bends in conduit runs

Types of Conduits

Conduit systems are classified based on the material used to make the tubing, mechanical stiffness and wall thickness. The material is selected for mechanical protection and corrosion resistance after taking into consideration the cost factor. There are special guidelines to be followed for wiring equipment in hazardous areas that need prior approval. Based on these factors, we examine a few prominent conduits:

Form 35/5/85 ex. Appleton LB400M

The Form 35 is used for malleable iron unilets as they have high tensile strength and ductility along with high corrosion and shock resistance. With the easy inbuilt rollers of type C (1-1/4” thru 4”) and type LB (1-1/4” thru 4”), these type of conduits help eliminate the damage when cable is pulled through the hubs. Form 5 has inbuilt rollers on all 11⁄4 to 4 C and LB bodies to facilitate wire pulling.

Form 7 ex. Crouse hind LB37

The Form 7 ex. Crouse hind LB37 is compatible with rigid and intermediate conduits for indoor as well as outdoor installation. It is made of cast iron or cast aluminium for a long life. It is extremely suitable for compact installations with rigidly threaded conduits of various shapes and sizes. The Form 7 has an exclusive snap tight and wedgenut cover attachment to provide clear, unhindered cover opening.

Mogul ex. Appleton BLB400m

The Mogul ex. Appleton BLB400m has a large body size that facilitates pulling of large and heavy conductors and are used as cast covers for providing additional wiring area. These are best used for pulling straight, 45° or 90° angle turns as well as for making taps and splices.

Form 8 ex. Crouse LB38

The Form 8 ex. Crouse LB38 is a 1” rigidly threaded conduit without cover and gasket made of Feraloy iron alloy. It is useful for indoor and outdoor use and comes in sizes ½” through 4”.

Form 9 ex. Crouse LB39

5-pin SPDT (single pole, double throw) automotive relay.

Relays are essentially two parts in one package. The first part is an inductive coil (pins 85 and 86). This coil is the “trigger” function of the relay. By applying both a positive (+) and ground (-) to the contacts, current passes through the coil. When current passes through the coil, a magnetic field is generated and moves the switch (the arrow in the diagram). This is where the second part of the relay comes into play.

The second part of the relay is the “switch.” The switch has three interface contacts—common, normally closed, and normally open. “Normally” refers to the state of the relay not being energized.

While relays can be used for virtually any task, there are some very useful, simple applications for adding LED lighting to a vehicle. Please note that this wiring only pertains to the relay—not the wires in the vehicle. Before interfacing with a wire in a vehicle, always ensure you test the wire with a digital multimeter first to confirm circuit function.

Positive Switching

Positive switching is used for applications where the “trigger” for your switch or circuit is positive. This could be an ignition, brake, or reverse light wire for example.  This could be used for applications such as off-road light bars, work lights, additional brake lights, and other exterior lighting.

Negative Switching

Negative switching is used for applications where the “trigger” for your switch or circuit is negative. Negative triggers are often found in door, hatch, and trunk triggers as well as many interior switches. This could be used for applications such as footwell lighting, truck bed lighting, under-hood lighting, and other interior lighting.

Switch Activated With Ignition Override

This is useful for applications where you want to turn your light on or off with a switch but only want the light to remain on when the car is running or key is in the “ignition” position. The main advantage to this is—even if the switch is left on—the light (or output circuit) will shut off when the key is turned off so that the battery will not be run down.

For technical questions, don’t hesitate to call us toll free at 866-590-3533. Our customer service and technical support teams are available from 8:30 a.m. to 8 p.m. CDT Monday-Thursday and 8:30 a.m. to 4 p.m. CDT on Friday.