ND Electrician case studies
ND Electrician · Put your knowledge to work in context.
The North Dakota State Electrical Board (NDSEB) is the state body responsible for examining applicants and issuing licenses to those who demonstrate the necessary qualifications and knowledge in the laws of electricity and electrical codes. The board also has jurisdiction over all electrical installations, which is how it ensures inspections are performed efficiently and on time, meet minimum standards of national and state codes, and deliver customer service and satisfaction. The ND Electrician case studies are 5 cases and about 2,916 words.
1Long 230 V Submain: Voltage Drop and Added Load
A 230 V single-phase submain feeds a compressor in a workshop. The route from the main intake to the compressor isolator is 60 m, run as 4 mm² two-core PVC-insulated cable clipped direct.
602 words, about 3 min2TN-S Radial Circuit: Zs Too High for a Type C MCB
A 20 A type C MCB protects a 25 m radial circuit wired in 2.5 mm² line and 1.5 mm² CPC thermoplastic twin-and-earth. The installation is TN-S with a measured external loop impedance Ze of 0.8 Ω.
624 words, about 3 min3Three-Phase Motor: Cable Derating and Overload Setting
A 15 kW, 400 V three-phase induction motor drives a pump. The motor has a power factor of 0.85 and an efficiency of 90%.
581 words, about 3 min4Domestic Maximum Demand and a New 7 kW Car Charger
A 230 V single-phase domestic consumer unit is supplied through a 100 A main fuse and 25 mm² tails. The installed circuits are: lighting totalling 1.2 kW; two 32 A ring final circuits; a 10 kW cooker; an 8.5 kW instantaneous shower; and a 3 kW immersion heater.
547 words, about 3 min5Buried SWA to a Detached Garage: Depth, RCD and Armour as CPC
A 6 mm² three-core SWA cable supplies a detached garage 35 m from the house. It is buried directly in garden soil at a depth of 450 mm along most of the route, with no warning tape or conduit, and rises into the garage through a plastic sleeve.
562 words, about 3 min