Oklahoma Electrical Practice Exam

An electric discharge fixture with multiple base lamp holders connected to a 30 amp branch circuit requires connector ratings of what percentage of the fixture load current?

1. 100%

2. 110%

3. 125%

4. 150%

The correct answer is: 125%

In determining the connector ratings for an electric discharge fixture with multiple base lamp holders connected to a 30 amp branch circuit, it is essential to consider the National Electrical Code (NEC) guidelines regarding overload conditions. When sizing connectors, the NEC recommends using a rating that exceeds the load current to ensure safety and reliability. For continuous loads, the general rule is to apply a factor of 125% of the load current. This is designed to account for potential inrush currents and provide additional capacity to handle any unexpected increases in electrical demand without overheating or failing. In this scenario, the connector ratings should be set at 125% of the fixture load current to maintain safe operation and to comply with regulations. This approach helps prevent connectors from being overloaded, thereby reducing the risk of equipment damage or fire hazards. Therefore, the choice indicating that connector ratings should be 125% of the fixture load current is the correct answer.