Interpret CEC Rules and Regulations Concerning HV Control and Protective Equipment

Question 1

According to CEC regulations, what safety feature must compartments containing HV fuses have?

Answer 1

Interlocking

Question 2

When used indoors, HV fuses must be in an acceptable enclosure or in a room of what type of construction?

Answer 2

Non-combustible

Question 3

What are three pieces of HV equipment that frequently use HV fuses?

Answer 3

• Transformers
• Capacitors
• Motors

Question 4

Spacing between fuses must increase with fuse _______ rating

Answer 4

Voltage

Question 5

When used for the protection of VT’s, the current rating of a fuse must not exceed _____ A

Answer 5

3

Question 6

Which table in the CEC provides information on the rating of HV fuses for transformers?

Answer 6

Table 50

Question 7

Which table in the CEC provides information as to minimum spacing distances between HV fuses assembled in the field?

Answer 7

Table 35

Question 8

With what type of HV switch are current-limiting fuses commonly used?

Answer 8

Load-break

Question 9

What is the purpose of fuse interlocking?

Answer 9

To prevent someone entering a fused cubicle compartment that is live

Question 10

Is there a difference between the spacing requirements of expulsion and non-expulsion fuses?

Answer 10

Yes. For any given voltage, more spacing is required between the expulsion types than between the non-expulsion types