EGC
Grounded conductors
Types of equipment grounding conductors
100

Your over current device is set at 60 amps. What is the minimum sized Equipment ground required in Cu?

Table 250.122

#10



100

What is the scope of Article 200?


This article provides requirements for the following: 

  1. Identification of terminals
  2. Grounded conductors in premises wiring systems
  3. Identification of grounded conductors
100

What conditions must be met to be able to use Flexible metallic conduit as an equipment ground.

  1. The conduit is terminated in listed fittings.
  2. The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
  3. The size of the conduit does not exceed metric designator 35 (trade size 11/4).
  4. The combined length of flexible metal conduit and flexible metallic tubing and liquidtight flexible metal conduit in the same ground-fault current pathdoes not exceed 1.8 m (6 ft).
  5. If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, an equipment grounding conductor shall be installed.
200

Your over current device is set at 100 amps. What is the minimum sized Equipment ground required in Cu?

Table 250.122

#8

200

200.2(B)

The continuity of a grounded conductor shall not depend on a metallic connection to a metallic enclosure, raceway or cable armor.


Give an example.

Grounded conductors in a service panel cannot be terminated onto ground bars. They must be terminated onto a neutral bar.

200

What conditions must be met to be able to use Liquid tight Flexible metallic conduit as an equipment ground?

  1. The conduit is terminated in listed fittings.
  2. For metric designators 12 through 16 (trade sizes 3/8 through 1/2), the circuit conductors contained in the conduit are protected by overcurrentdevices rated at 20 amperes or less.
  3. For metric designators 21 through 35 (trade sizes 3/4 through 11/4), the circuit conductors contained in the conduit are protected by overcurrentdevices rated not more than 60 amperes and there is no flexible metal conduit, flexible metallic tubing, or liquid-tight flexible metal conduit in trade sizes metric designators 12 through 16 (trade sizes 3/8 through 1/2) in the ground-fault current path.
  4. The combined length of flexible metal conduit and flexible metallic tubing and liquidtight flexible metal conduit in the same ground-fault current pathdoes not exceed 1.8 m (6 ft).
  5. If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, an equipment grounding conductor shall be installed.
300

Your over current device is set at 200 amps. What is the minimum sized Equipment ground required in Cu?

Table 250.122

#6

300

Explain 200.4(B)

When you have multiple circuits and multiple neutrals coming out of one conduit you need to identify which neutral belongs to which circuit with a zip tie.

(preferred)

400

On the board, draw a sketch of a riser diagram with an underground meter base, service disconnect and main lug panel. Highlight where the EGC is located.

The Equipment ground will be located between the service disconnect and the main lug panel.

400

How should a Grounded conductor #6 or smaller be identified?


Explain the dangers of an un identified grounded conductor.

200.6

1-8

Typically we will use white tape.

Service rated wires will have the grounded conductor with a white stripe from the manufacturer.

500

Where a single equipment grounding conductor is run with multiple circuits in the same raceway, cable, or cable tray, it shall be sized for the _____ overcurrent device protecting conductors in the raceway, cable, or cable tray.

Give an example.

250.122 (C)

Shall be sized for the largest over current device protecting the conductors.

500

Neutral conductors shall not be used for more than one branch circuit, for more than one multiwire branch circuit, or for more than one set of ungrounded feeder conductors unless specifically permitted elsewhere in this Code.

Explain why this may be a safety hazard if this code is not followed.

Neutral conductors will not trip a breaker if they are overloaded. The wire may burn and cause harm to people or damage property.

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