Elementry Diagrams

Question 1

What is an #33 on an electrical print?

Answer 1

A position switch or limit switch.

Question 2

What is an #30 on an electrical print?

Answer 2

An alarm.

Question 3

What is a #50 on an electrical print?

Answer 3

Instantaneous over current trip relay

Question 4

What is an A contact?

Answer 4

A contact that is closed when energized and open when de energized.

Question 5

What is a #72 on an electrical print?

Answer 5

DC circuit breaker.

Question 6

What does an Anti-pump Circuit do?

Answer 6

Prevents a breaker from cycling when a trip and close signal exists.

Question 7

What is a #52 on an electrical print?

Answer 7

It is an AC circuit breaker?

Question 8

What does a red light for a breaker let you know?

Answer 8

Shows that the breaker is closed and that the trip coil has a flow path.

Question 9

What is a #87 on an electrical print?

Answer 9

Differential current relay.

Question 10

What is an #49 on an electrical print?

Answer 10

Thermal over load.

Question 11

What is an #27 on an electrical print?

Answer 11

Under voltage.

Question 12

What is a B contact?

Answer 12

A contact that is open when energized and closed when de energized.

Question 13

What is a #88 device on a drawing?

Answer 13

Motor starting contact.

Question 14

What is an #51 on an electrical print?

Answer 14

Over load trip relay ( the pump is working to hard drawing to much current)

Question 15

What is a #101 on an electrical print?

Answer 15

A control switch.

Question 16

What is a #50N on an electrical print?

Answer 16

A neutral over current.

Question 17

What is a #43 on an electrical print?

Answer 17

A manual transfer switch. (Local/remote)

Question 18

What is a #5 on an electrical print?

Answer 18

Used for load shed or black out.

Question 19

What is a #63 on an electrical print?

Answer 19

It is an presser or level relay.