Deck 21: Reading Large Schematic Diagrams

Question 1

Figure 21-5
At the right side of the schematic shown in the accompanying figure is the notation "LOCATED IN RELAY CABINET". What information is given by this notation?

Answer 1

This notation gives the physical location of such control components as starters, relays, and terminal blocks.

Question 2

Push buttons, HOA switches, pilot lights, and so on are generally located on a control terminal where an operator has access to them.

Answer 2

True

Question 3

____________________ is generally used to help the electrician interpret the meaning of certain components and find contacts that are controlled by coils.

Answer 3

Notation

Question 4

Figure 21-2
The accompanying figure shows ____________________ current transformers.

Question 5

In the accompanying figure, at the far right-hand side is the notation (-08, 24, 14). What do these numbers indicate?

Question 6

What does the notation (EP12246-00) indicate?

Question 7

Schematics in industry are often small.

Question 8

It is common for high voltage disconnect switches to have four contacts for the switch.

Question 9

Figure 21-2
The accompanying figure indicates that the motor is connected to a 2300-volt ____________________ phase 60 hertz power line.

Question 10

Schematics in industry may contain several pages.

Question 11

Figure 21-4
On line 02 of the schematic shown in the accompanying figure, there are three terminals marked TB-5B. These labels indicate ____________________ points.

Question 12

What does it indicate if coil symbols are used for overloads, not heater symbols, in a schematic?

Question 13

How much output current do current transformers produce under a short-circuit condition?

Question 14

Figure 21-2
The accompanying figure indicates that there is a 200 amp, disconnect switch rated at 5,000 volts that can be used to disconnect the ____________________ from the power line.

Question 15

All manufacturers use the same numbering and notation system for schematics.