Page 205 - Electromechanical Devices and Components Illustrated Sourcebook

Chapter 9 Connectors 167

Insulating Cap

Set Screws

Molded
Insulating Jacket

Power Input
Power Outputs
Figure 9-69 Socket-Type Power Distribution Buss

15 Amp 20 Amp 30 Amp 50 Amp

cap. This type of buss is popular in industrial distribution sys- G G G G
tems and equipment. 125 V W W W W

5-15 5-20 5-30 5-50
NEMA Connectors G G G G

The National Electric Manufacturers Association (NEMA) 250 V
publishes standards for the construction of a wide range of AC
power connectors. These connectors are universally accepted 6-15 6-20 6-30 6-50
by the electrical community and are available in virtually
G G G G
every hardware and home improvement store in the United
States. The more obscure patterns are readily available from 277 V W W W W
any electrical or industrial supply house. NEMA connectors
fall into two basic categories, straight blade and twist lock. 7-15 7-20 7-30 7-50
Figures 9-70 through 9-73 show the straight blade patterns
G G G G
and their associated voltage and current ratings. Figures 9-74
through 9-78 show the twist lock patterns and their associated 347 V W W W W
voltage and current ratings.
24-15 24-20 24-30 24-50
Figure 9-71 Two-Pole, Three Wire Grounding NEMA
Straight Blade Connectors

15 Amp 20 Amp 30 Amp
15 Amp 20 Amp 30 Amp 50 Amp

W W W
W
125 V 125 V Y X
Y X Y X
250 V
1-15 10-20 10-30 10-50
X X X X
250 V
250 V Z Y Z Y Z Y Y Z
3 Phase
2-15 2-20 2-30 11-15 11-20 11-30 11-50
Figure 9-70 Two-Pole NEMA Straight Blade Figure 9-72 Three-Pole, Three Wire NEMA Straight Blade
Connectors Connectors