DC Electrician case studies
DC Electrician · Put your knowledge to work in context.
The DC Electrician credential is a professional license issued by the District of Columbia government through the Department of Licensing and Consumer Protection (DLCP), the agency whose site hosts licensing information for trades and occupations. This page is an independent study resource for candidates preparing for the DC Electrician licensing exam. The DC Electrician case studies are 5 cases and about 3,694 words.
1Adding a 36 A Continuous Load to an Already Derated Raceway
A journeyman is adding a 208 V, single-phase resistance heat bank to an existing commercial tenant space. The nameplate shows 36 A continuous.
720 words, about 4 min2Grounding and Bonding a 200 A Service Upgrade
A contractor is upgrading a detached single-family house from a 100 A fuse panel to a 200 A, 120/240 V single-phase service. The service conductors are 2/0 copper.
778 words, about 4 min3Rooftop Unit: Nameplate MCA/MOP Versus the Reused Circuit
A 3-ton packaged rooftop unit is being replaced on a 208/230 V single-phase system. The new nameplate reads: minimum circuit ampacity (MCA) 26.4 A; maximum overcurrent protective device (MOP) 40 A; compressor rated-load current 16.5 A; outdoor fan FLA 2.2 A.
725 words, about 4 min4Energized Voltage Check at an Unlabeled 480 V MCC
on a Tuesday, production is running and a 480Y/277 V motor control center bucket feeding a 75 kVA dry-type transformer has been tripping intermittently. The maintenance manager tells a licensed journeyman to 'pull the bucket and check voltage on the line side - it will take two minutes.' The MCC has no arc flash label.
720 words, about 4 min5Bid Markup, a Change Order, and a Permit Signed Under Someone Else's Name
A licensed electrical contractor is finishing a bid for a 1,800 sq ft tenant fit-out. Direct costs are 240 journeyman hours at 58/hr burdened, 11,300 in materials, and 1,200 in rented equipment and permit fees.
751 words, about 4 min