This article is about Electrical QC course based on Aramco standards, international standards and codes. This complete series consists of lot of MCQs and questions which are useful for QC interview and also CBT exam of Aramco. In this article we discuss about cable testing and separation requirements of electrical installation.
Cable Testing and Separation Requirements of Electrical QC Course.
1. What is the minimum separation (above or below ground) between a power cable operating at 1000 V or above, up to 34.5 kV, and a power/control cable operating at less than 1000 V?
Answer: B
As per NEC and SAES-P-104 specifies a minimum separation of 300 mm for this scenario.
2. 2. What is the minimum separation (above or below ground) between any cable operating above 34.5 kV and cables operating at or below 34.5 kV?
Answer: C
Asper NEC and SAES-P-104 15.2 specifies a minimum separation of 1 meter for this scenario.
3. Which of the following tests is required for low voltage cables (600, 450/750, or 600/1000 V rated) after installation and prior to service?
Answer: C
As per SAES-P-104 and NEC that these cables shall be 1000 V DC megger tested.
4. How should medium voltage cables (5 kV through 35 kV) be tested before splicing to existing cables?
Answer: C
SAES-P-104 The document specifies both tests are required before splicing.
5. What additional test is required if the existing medium voltage cable has been in service for less than five years?
Answer: B
As per NEC and SAES-P-104 document specifies this requirement for cables in service for less than five years.
6. Which standard should be used for HV cable jacket integrity testing?
Answer: C
SAES-P-104 states that IEC 60229 should be used for HV cable jacket integrity testing.
7. What is the DC high potential value for testing the integrity of the overall jacket of direct buried cables rated 5 kV and higher?
Answer: B
SAES-P-104 specifies this value for the DC high potential test.
8. What is the AC high-potential test voltage for a 35 kV cable in service for the first 5 years?
Answer: C
SAES-P-104 The document lists 100 kV DC as the test voltage for a 35 kV cable.
9. How long should the DC high potential test be conducted on medium voltage cable jackets?
Answer: B
SAES-P-104 The document specifies the test duration as one minute.
10. For a cable voltage rating of 69 kV, what is the DC high-potential field test voltage after installation?
Answer: C
The commentary for paragraph 15.4 states that if sealing is required by the NEC, it must meet the NEC and specified paragraphs.
Reference Table 3 is here for DC and AC High-Potential Field Test Voltages.
