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Tuesday, January 17, 2012
Monday, January 9, 2012
Types of Electrical Connectors
There are many types of automotive and marine electrical connectors. Some of the common electrical connectors are butt connectors, ring terminals, spade terminals, and quick disconnect connectors.
Butt connectors are used to splice two wires together.
Ring terminals are used to connect the wire to a stud point like a screw for grounding or similar.
Spade terminals can be used like ring terminals but the nice thing about the spade terminal or fork terminals is that the stud does open to connect to it. The spade can slide around the stud for a connection.
Quick disconnect connectors are used to connect to a tab and come in four tab sizes,.110 tab is 1/8 inch,.187 tab is 3/16 inch,.250 tab is 1/4 inch and.375 tab is 3/8 inch. There are male and female quick disconnect connectors the female will slide onto the male tab. Other electrical connectors include copper lug ring terminals, crimp caps, t tap connectors, plier tap connectors, hook terminals, and pin terminals.
Electrical connectors can be insulated or non insulated and come in various types of insulation. The non insulated electrical connector is usually bare copper that has a tin plating. Insulated terminals can come in PVC insulated, nylon insulated and heat shrink insulated. The PVC insulated type are usually the cheapest and most common. PVC tends to be a harder insulation and can crack when crimped and for this reason I do not recommend using them. Nylon insulation is a softer insulation and will not crack when the terminal is crimped. The nylon insulation will also withstand higher temperatures. I recommend using nylon insulated terminals and connectors. Heat shrink insulated terminals and connectors are great for applications where the terminal is exposed to outside elements such as high temperatures, rain, snow, and underwater applications.
The heat shrink insulated terminals with adhesive lining create waterproof connections to the wire. Although heat shrink terminals can be costly they are the best connectors to use since the will last the longest and almost never corrode.
When purchasing electrical connectors it is best to use UL listed terminals and connectors to make sure you are getting quality connections. I recommend staying away from terminals and connectors that are made in China due to the low quality standards and cheap materials they use to make the connectors. If you search the internet you can find quality terminals and connectors at reasonable prices.
Thursday, January 5, 2012
Wiring Three Way Switches
The distinction between a proper switch and a three way switch is one supplementary terminal,or connection. A 3 way switch has 2 terminals that are either silver or brass coloured and one concluding that is dark coloured. The silver or brass terminals are called travellers or messengers and the dark coloured concluding is called the common. If all three terminals appear similar in colour, the base concluding will be identified by the word "common" stamped on the back of the switch.
The arrangement of these terminals on the switch can vary depending upon the manufacturer, so check determined to ensure proper identification of the base terminal. In a 3 way switch circuit there will be two 3 way switches and a light or series of lights that are controlled by the switches. As each switch can turn the lights on or off,there needs to be a means by which one switch can recapitulate this back to the other switch. This is the function of the two travellers or messengers and you will notice in the wiring diagrams that regardless of the configuration, the 2 travellers or messenger terminals on each switch are all the time interconnected (trace the red and white conductors of the 3 conductor wire).
As the travellers or messenger terminals are all the time interconnected, the base concluding is the only one left. To understand this terminal, consider for a moment a proper switch that has only 2 terminals. When wiring a proper switch the incoming power feed (hot) conductor is connected to one concluding (usually lowest right) and the outgoing power feed to the lights is connected to the other concluding (usually top right). This is the purpose of the base terminals in a 3 way switch circuit, on one of the two 3 way switches the incoming power feed (hot) conductor is connected to its base concluding and on the other of the two 3 way switches the outgoing feed to the lights is connected to its base terminal.
It is foremost to note that the white conductor in the 3 conductor wire (red, black and white) connected between the two switches is not a neutral. Depending on the switches on/off position either the red or white conductor will be hot.
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Tuesday, January 3, 2012
Tommy's Trade Secrets - How To Change A 3 Pin Plug
We show you how to change a 3 pin plug in this video tutorial. Remember - If you don't feel confident - Always contact a competent person.
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