Often asked: Why Are Explosion-proof Motors Not Normally Used On Standard Equipment?

When referring to motors to what does the insulation class relate?*?

When referring to motors, to what does the “insulation class” relate? The alignment of a motor and the driven mechanism must be done at room temperature and_______. Which of the following voltages are not safe for a 208-V motor to operate?

What is the name of the plug on the bottom of a bearing with a grease connection?

Grease fittings, also known as zerk fittings or grease nipples, serve as lubrication points on bearing housings or other mechanical components. Their design provides a secure connection to a grease gun coupler for delivering precise amounts of grease into bearings and other moving systems.

How does the insulation factor of a motor affect its use?

How does the insulation factor of a motor affect its use? The insulation type or class (factor) of a motor allows a motor to operate at higher or lower ambient temperatures.

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What is the best method to repair a fractional horsepower motors?

What is the best method to repair a fractional horsepower motor that has a bad bearing? Replace the entire motor. A technician needs to check a single-phase compressor.

What is the contact surface of a typical contactor made of?

The surfaces where contacts touch are usually composed of metals such as silver or gold alloys that have high electrical conductivity, wear resistance, oxidation resistance and other properties.

What is difference between Class B and Class F?

The F refers to the insulation class for the windings, while the B refers to an 80°C rise (the maximum temperature rise for Class B is 80°C). This type of notation is becoming more widespread because many motors use Class F insulation, and there is a reason for that.

What are bearing problems often caused by?

1. Lubrication Failure. According to a recent study, up to 80 percent of bearing failures are caused by improper lubrication. This includes insufficient lubrication, use of improper lubricants or excessive temperatures that degrade the lubricant.

What thread are grease nipples?

Grease fittings come in many different styles. There are two grease fittings that are very common. These are the 1/4″-28 thread and the 1/8″ NPT thread. However, there are other less common grease fitting threads in use.

Why is it called a Zerk fitting?

The Zerk design, named after Oscar Zerk, used a fitting much smaller than the Alemite pin-type and did not lock the hose coupler or hand gun and fitting together. Instead, the seal between them was maintained by the pressure of a pushing action when the operator applied the coupler to the fitting.

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Do all bearings have to be lubricated each year?

Some equipment needs all the bearings re-greased every day, some once a week, some every two weeks, and some once a month. In applications such as this, it is often beneficial to completely wash out the bearings once a year, re-pack with new grease, and continue on with the established re-greasing program.

What are 4 common types of motor enclosures?

The Most Common Types Of Electric Motor Enclosures

  • The most common types of enclosures are:
  • Open Drip Proof (ODP)
  • Weather Protected (WP1 / WP2)
  • Totally Enclosed Fan Cooled (TEFC)
  • Totally Enclosed Non-Ventilated (TENV)
  • Totally Enclosed Air Over (TEAO)
  • Totally Enclosed Forced Ventilated (TEFV)
  • XP (Explosion Proof)

How do you calculate the minimum insulation resistance of an engine?

The minimum insulation resistance of new, cleaned or repaired windings with respect to ground is 10 Megohm or more. The minimum insulation resistance, R, is calculated by multiplying the rated voltage Un, with the constant factor 0.5 Megohm/kV.

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