7/30/2019 Holt Final Presentation

1/43

1

7/30/2019 Holt Final Presentation

2/43

2MikeHolt.com

Dedication

I would like to take this moment to thankGod for giving me the opportunity andskill to help others.

7/30/2019 Holt Final Presentation

3/43

Electric Shock

Death and/or severe injury can occurwhenever voltage pushes electrons

through the human body, particularly

through the heart.

7/30/2019 Holt Final Presentation

4/43

7/30/2019 Holt Final Presentation

5/43

Electric ShockThe hazard of death and/or severe

electric shock can occur whenevervoltage exceeds 30V in a dry location

or 15V in a wet location.

7/30/2019 Holt Final Presentation

6/43

Electric Shock

The severity of electric shock isdependant on the path through the

body it follows and the magnitude of

the current flow.

7/30/2019 Holt Final Presentation

7/43

7/30/2019 Holt Final Presentation

8/43

Electric Shock

Current magnitude is dependent uponthe contact voltage and the

resistance of the path it follows

through the body

I = E/R.

7/30/2019 Holt Final Presentation

9/43

7/30/2019 Holt Final Presentation

10/43

7/30/2019 Holt Final Presentation

11/43

7/30/2019 Holt Final Presentation

12/43

Effective Ground-Fault Current

Path

7/30/2019 Holt Final Presentation

13/43

7/30/2019 Holt Final Presentation

14/43

7/30/2019 Holt Final Presentation

15/43

15

7/30/2019 Holt Final Presentation

16/43

7/30/2019 Holt Final Presentation

17/43

7/30/2019 Holt Final Presentation

18/43

7/30/2019 Holt Final Presentation

19/43

Grounding does not reduce ground-

fault voltage to a safe value.

7/30/2019 Holt Final Presentation

20/43

7/30/2019 Holt Final Presentation

21/43

Why do we drive ground rods at

poles?

7/30/2019 Holt Final Presentation

22/43

7/30/2019 Holt Final Presentation

23/43

7/30/2019 Holt Final Presentation

24/43

7/30/2019 Holt Final Presentation

25/43

Grounding and the NECThe purpose of this Code

is the practicalsafeguarding of persons

and property from

hazards arising from the

use of electricity.

7/30/2019 Holt Final Presentation

26/43

26

7/30/2019 Holt Final Presentation

27/43

7/30/2019 Holt Final Presentation

28/43

28

System Grounding

7/30/2019 Holt Final Presentation

29/43

29

7/30/2019 Holt Final Presentation

30/43

30

7/30/2019 Holt Final Presentation

31/43

31

7/30/2019 Holt Final Presentation

32/43

32

Equipment Grounding

7/30/2019 Holt Final Presentation

33/43

33

7/30/2019 Holt Final Presentation

34/43

7/30/2019 Holt Final Presentation

35/43

35

7/30/2019 Holt Final Presentation

36/43

36

Bonding Electrically Conductive

Materials

7/30/2019 Holt Final Presentation

37/43

37

7/30/2019 Holt Final Presentation

38/43

38

Effective Ground-Fault Current

Path

7/30/2019 Holt Final Presentation

39/43

39

7/30/2019 Holt Final Presentation

40/43

40

7/30/2019 Holt Final Presentation

41/43

7/30/2019 Holt Final Presentation

42/43

7/30/2019 Holt Final Presentation

43/43

QUESTION & ANSWER SESSION