LOT 110.04 Electrical Diagrams

Question 1

• LOT 110.04 Electrical Diagrams*
• • *

What is a 52 device?

Answer 1

AC Circuit Breaker

A device that is used to close and interrupt an AC power circuit under normal conditions or to interrupt this circuit under fault or emergency conditions

Question 2

• LOT 110.04 Electrical Diagrams*
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What is a 86 device?

Answer 2

Lockout Relay

A hand or electrically reset auxiliary relay that is operated upon the occurrence of abnormal conditions to maintain associated equipment or devices inoperative until it is reset.

Question 3

• LOT 110.04 Electrical Diagrams*
• • *

What is a 87 device?

Answer 3

Differential Protective Relay

A protective relay that functions on a percentage or phase angle or other quantitative difference of two currents or of some other electrical quantities.

Question 4

• LOT 110.04 Electrical Diagrams*
• • *

What is a 51 device?

Answer 4

AC Time Overcurrent Relay

A relay a relay that operates when its ac input current exceeds a predetermined value, and in which the input current and operating time are inversely related through a substantial portion of the performance range.

Question 5

• LOT 110.04 Electrical Diagrams*
• • *

What is a 64 device?

Answer 5

Ground detector relay

A relay that operates on failure of machine or other apparatus insulation to ground.

Question 6

• LOT 110.04 Electrical Diagrams*
• • *

What is a 50 device?

Answer 6

Instantaneous overcurrent / Rate of Rise Relay

A relay that functions instantaneously on an excessive value of current or on an excessive rate of current rise.

Question 7

• LOT 110.04 Electrical Diagrams*
• • *

What is a 27 device?

Answer 7

Undervoltage Device

A relay which operates when its input voltage is less than a predetermined value.