Business Management, Estimating, and Plan Reading
Business Management
What to master
This domain tests the business side of contracting: licensing, contracts, insurance, employment, liens, and permits. In Connecticut, electrical work must be performed under a licensed electrical contractor, with unlimited and limited contractor and journeyperson licenses available. Work generally requires a permit from the local building official and inspections at required stages. Know the elements of a valid contract - offer, acceptance, consideration, and competent parties - and why written change orders matter. Understand mechanic's lien rights, prompt-payment expectations, workers' compensation, general liability, and the difference between an employee and a subcontractor for tax and liability purposes. OSHA obligations follow the employer, not the general contractor.
Traps
Assuming a journeyperson's license lets you contract directly with a homeowner; starting work before a permit; performing verbal change orders and losing the argument later; and treating a subcontractor like an employee when controlling their daily work.
Rule of thumb
Never sign or start a project without three things in hand: a signed scope of work, the required permit, and certificates of insurance. Any change in scope gets a written change order before the work proceeds - a one-page form signed by the owner is enough to protect the invoice.
Estimating
What to master
Estimating combines a quantity takeoff with labor units, material pricing, and overhead. Learn to count devices, measure conduit and cable runs, add for waste and slack, and apply published labor units expressed in hours per unit. Then layer on job costs: material, labor with burden (payroll taxes, insurance, fringe), equipment, permits, subcontractors, and general conditions. Small tools, supervision, and temporary power often get missed. Profit goes on last, and the order matters - markup and margin are not the same. Also understand unit pricing, lump-sum versus time-and-material, and contingency for unknown conditions.
Traps
Confusing markup with margin; applying labor units without a productivity factor for a remodel; forgetting waste on cable and fittings; and omitting burden on labor, which typically adds 25–40% to the wage rate.
Worked example
Your direct cost is $8,000 and you want a 20% margin. Price = cost ÷ (1 − margin) = 8,000 ÷ 0.80 = $10,000. If you instead applied a 20% markup, you would price at $9,600 - a 16.7% margin, and $400 less profit than intended on a single job.
Plan Reading
What to master
Plan reading means translating drawings into a takeoff. Start with the title block and index, then the floor plans, then the electrical plan, panel schedules, and riser diagram. Know standard architectural scales: at 1/4 in = 1 ft, a quarter inch on paper equals one foot in the field, so a 5 in line represents 20 ft. Recognize symbols for receptacles, switches, luminaires, panels, junction boxes, and fire alarm devices, and remember that a number next to a symbol usually indicates circuit and panel. Section and elevation drawings show mounting heights; details show assembly. Specifications govern quality and product, and generally take precedence over drawings when they conflict.
Traps
Scaling off a drawing instead of reading the dimension string; missing the general notes that change mounting heights; assuming a symbol means a specific voltage; and overlooking the panel schedule when counting circuits.
Worked example
A wall measures 3.5 in on a 1/8 in = 1 ft plan. Since 1/8 in equals 1 ft, the wall is 3.5 ÷ 0.125 = 28 ft long. In practice, confirm with the dimensioned string on the drawing - scaling is only a cross-check, and photocopied or resized prints will scale incorrectly.