1How do you know if a switch motor is rated?
Has FLA or HP marked on the switch
2Why are motor rated switches needed?
To handle the higher motor starting amperage
3Describe a pilot duty rated switch?
Switch related ar 1 amp or less, or rated in VA
4Describe a power duty rated switch?
Switch with heavier contacts that can handle more than a couple amps
5Why can't you use power duty switches all the time, even with pilot duty loads?
Power duty contact do not make tight enough if dusty or oxidized. There is no arc on pilot loads to burn the contacts clean
6What causes intermittent operation, or erratic operation of switches that are used of pilot duty loads?
Oxidation or dirt on the contacts
7If a switch is rated in"VA," what does that tell you about it's rating, is it pilot or power duty?
Pilot duty
8What does the term "pole" means as related to switches?
How many lines it can cut. (1 set of contacts)
9What does the term "throw" mean when related to switches?
How many directions it can switch the load
10How many lines can be cut with a SPST switch?
1
11How many lines can be cut with a SPDT switch?
1
12How many lines can be cut with a DPDT switch?
2
13WHat is the difference between a SPDT, and a SPDT center off switch?
CO switch has a mid position in the handle that is "OFF"
14What is a three way switch used for?
Controlling a load at 2 different locations
15What is a four way switch used for?
Controlling a load in 3 different locations
16To be able to turn a light on or off at two separate locations, what kind and how many switches are needed?
2 Three way switches
17Describe a canopy switch?
Small switch, with a threaded shaft that mounts through a single hole
18To remove a snap in rocker switch it is usually necessary to do what?
Squeeze the tabs on the top and bottom
19What are the advantages to using lighted rocker switches?
Can tell when they are on, and saved the cost of a separate indicator light
20Lightened rocker switches must have how many separate electric lines wired to them? Why?
2
21Why are microwitches so widely used in equipment today?
Multi-functional, low cost, reliable, come in so many ratings and designs
22What different ratings are microswitches available in?
Pilot, power, and motor duty
23What must you do if the microswitch is going to operate a motor load?
Be sure it is HP rated
24What is the proper name for a knife switch with fuses, mounted in a metal enclosure?
Fused disconnected
25What ratings are limit switches available in?
Pilot, power, and motor rated
26What is the main advantage of limit switches?
Sealed to prevent dirt, water, oil etc
27The pust button or selector portion of a motor switch is referred to as what?
Operator
28The switching part of a motor switch is referred to as what?
Contact block
29Can parts of motor switches made by different manufacturers be mixed? Why or why not?
No, they will not fit together
30To purchase a motor switch what all will you need to specify?
Type of operator, contact block rating needed, and number of N.O and/or N.C. blocks
31To replace a portion of a motor switch, what will you need to specify?
The manufacturer name
32How does a reed switch operate?
Opens and closes as magnetic field passes over the switch
33WHat happens if you reverse the float ball on a reed switch operated float switch?
THe switch operates opposite
34Does an infinite heat switch control temperature?
No, it controls heat
35To which terminals on an infinite heat switch should the power ines be connected?
L1 and L2
36To which terminals on an infinite heat switch should the load be connected?
H1 and H2
37To which terminals on an infinite heat switch should a pilot light be connected?
P and L2
38Which terminals on an infinite heat switch make and break as the switch cycles?
L2 and H2
39Are terminals P and L1 the same connections electrically?
Yes
40What will happen if the power line is connected to terminal P?
The pilot duty switch will contact and melt down
41In what voltages are infinite switches available?
120, 208, and 240 volt
42What does the letter "B" in the model number stamped on the side of an infinite switch signify?
Broiler range switch
43How does this "B" switch operated differently than a regular infinite switch?
More adjustment at the higher heat range of the curve
44When using an infinite switch, why don't you just connect a pilot light across the load like you would any other time?
The light will constantly blink and the customer will think there is a problem
45What is the maximum amp rating of an infinite switch?
15 Amps. In a heated area they handle no more than about 12 or 13 Amps
46Do infinite switches hold up well when used at the max. load rating?
No, the heat derates them
47When replacing an infinite switch what else must you do?
Replace the wires and terminals to the switch
48What are the two primary causes for failures of infinite switches?
Burned wire connections and excessive ambient heat
49What are the three critical things that must be matched if you substain an infinite switch?
Voltage, Regular or broiler range, and mounting type
50What effect does high ambient temp. have on a switch?
51If you are servicing a piece of equipment that uses multiple infinite switches, what will happen if the old switch is "B" rated, and the new on is not?
52What will happen if the old switch was not "B" rated and the new one is?