PIKES PEAK REGIONAL BUILDING DEPARTMENT
2880 International Cr., Colorado Springs, CO 80910 • Telephone 719-327-2880 • www.pprbd.org
Guidelines for Wiring Single Family Dwelling Units
Wiring must comply with the currently adopted National Electrical Code (NEC), a code that is neither intended as a design specification nor instruction
manual for untrained individuals. Its purpose is the practical safeguarding of persons and properties from hazards arising from the use of electricity.
This handout is an overview of the NEC requirement for single family dwellings. The information does not cover requirements for every installation; it is
to be used along with the NEC.
ROUGH INSPECTION - All wire must be pulled, stapled properly, and all
splices made and ready to accept devices and fixtures. Do not install any
devices or fixtures or cover any wiring with insulation or wall covering,
such as drywall or paneling, prior to the rough-in inspection.
FINAL INSPECTION - The electrical installation must be complete when
you request the final inspection. All devices and fixtures must be installed
and service equipment complete and labeled properly. All wiring must be
free from short circuits, ground fault and open circuits. All light fixtures
and light switches must be grounded. All kitchen cabinets must be in-
stalled.
Inspections
Review the following information to understand what work needs to be completed before requesting inspections.
Service
The service equipment must be large enough to supply the connected load which is calculated using the NEC. The minimum wire size for service
entrance conductors are listed below. The service equipment must be grounded in accordance with the NEC. The neutral must be bonded to the
service enclosure and the grounding electrode system defined in the NEC.
The main service panel must be mounted either outside or inside the dwelling as near as possible to the point of entrance of the service conductors to
the structure.
All service equipment and electrical panels must have a clear area of 30 inches wide and 36 inches deep in front of the equipment. This clear area
must extend from the floor to ceiling with no intrusions from other equipment, cabinets, counters, pipes, appliances, etc. Service equipment/panels are
NOT allowed in clothes closets or bathrooms, or over stairs.
CONDUCTOR TYPES AND SIZES
(RH - RHH - THHW - THW - THWN - THHN - XHHW - USE)
Copper
AWG
Aluminum & Copper-Clad AL
AWG
Service Rating
In Amps
4 2 100
3 1 110
2 1/0 125
1 2/0 150
1/0 3/0 175
2/0 4/0 200
3/0 250 kcmil 225
4/0 300 kcmil 250
250 kcmil 350 kcmil 300
350 kcmil 500 kcmil 350
400 kcmil 600 kcmil 400
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