CEA Reading Electrical Blueprints 4

Question 1

On electrical blueprints, 'EWP' beside a receptacle typically means:

Accepted Answer

Exterior Weatherproof

Answer

EWP stands for Exterior Weatherproof, indicating the receptacle is rated for outdoor or damp-location installation.

Question 2

What is a 'detail reference bubble' on an electrical drawing used for?

Accepted Answer

Pointing to a detail drawing with enlarged information on another sheet

Answer

A detail reference bubble contains a number and sheet reference, directing the reader to a larger-scale detail on another drawing.

Question 3

On a three-phase electrical system single-line diagram, three parallel lines represent:

Accepted Answer

A three-phase feeder or circuit

Answer

Three parallel lines on a single-line diagram indicate a three-phase conductor arrangement for feeders or branch circuits.

Question 4

When a blueprint note says 'BY OWNER' next to a piece of equipment, it means:

Accepted Answer

The building owner supplies that equipment, not the contractor

Answer

'By Owner' means the equipment is furnished by the building owner, and the electrical contractor only connects it.

Question 5

What does 'AIC' rating on a panel schedule indicate?

Accepted Answer

Ampere Interrupting Capacity of the overcurrent device

Answer

AIC (Ampere Interrupting Capacity) is the maximum fault current a breaker can safely interrupt without damage.

(CEA) Certified Electrical Apprentice Practice Test