CWEA E1 – Verified Study Guide (2026/2027 A+ Edition)|Complete
Electrical & Instrumentation Exam
Confined Space - (answer)A space that:
-is large enough to enter and work.
-has limited or restricted means for entry.
-is not designed for continuous occupancy.
Hot Work Permit - (answer)An employer's written authorization to perform work capable of providing a
source of ignition.
Inerting - (answer)A form of purging or ventilating a confined space where an inert gas (such as nitrogen,
carbon dioxide or argon) is used to displace the atmosphere in a confined space to remove fire or
explosion hazards. Causes oxygen levels to become unstable for re-entry.
Oxygen Safe Zone - (answer)19.5% to 23.5%
Below 19.5=unsafe for breathing
Above 23.5=explosive
Leader Line - (answer)The part or area of a drawing to which a number, note or other reference applies.
They are solid lines and usually terminate in a single arrowhead.
Hydraulic Term:
"Resistance" - (answer)A construction in the bore of the pipe which requires more pressure to pass the
same amount of water.
Hydraulic Term:
"Voltage"
(Assume water is flowing horizontally so gravity isn't a factor) - (answer)Electric potential is equivalent to
pressure and the voltage (or voltage drop/potential difference) is the difference in pressure between two
points.
, CWEA E1 – Verified Study Guide (2026/2027 A+ Edition)|Complete
Electrical & Instrumentation Exam
Hydraulic Term:
"Current" - (answer)Equivalent to a hydraulic volume flow rate; that is the volumetric quantity of flowing
water over time.
Ohm's Law - (answer)Current through a conductor between two points is directly proportional to the
voltage across the two points.
S.O.P. - (answer)Standard operating procedure.
N.E.C. - (answer)National Electrical Code.
N.F.P.A. - (answer)National Fire Protection Association
NPT - (answer)National pipe thread. Tapered pipe.
Compound Gauge - (answer)Displays negative AND positive pressure measurements
Cat1 Meter - (answer)Measures electronics
Cat2 Meter - (answer)Measures single-phase receptacles.
Cat3 Meter - (answer)Measures 3 phase distribution and single phase lighting equipment.
Cat4 Meter - (answer)Measures 3 phase at utility connection and any outdoor connections.
L.O.T.O. - (answer)Lock out tag out is an osha regulation.
Electrical & Instrumentation Exam
Confined Space - (answer)A space that:
-is large enough to enter and work.
-has limited or restricted means for entry.
-is not designed for continuous occupancy.
Hot Work Permit - (answer)An employer's written authorization to perform work capable of providing a
source of ignition.
Inerting - (answer)A form of purging or ventilating a confined space where an inert gas (such as nitrogen,
carbon dioxide or argon) is used to displace the atmosphere in a confined space to remove fire or
explosion hazards. Causes oxygen levels to become unstable for re-entry.
Oxygen Safe Zone - (answer)19.5% to 23.5%
Below 19.5=unsafe for breathing
Above 23.5=explosive
Leader Line - (answer)The part or area of a drawing to which a number, note or other reference applies.
They are solid lines and usually terminate in a single arrowhead.
Hydraulic Term:
"Resistance" - (answer)A construction in the bore of the pipe which requires more pressure to pass the
same amount of water.
Hydraulic Term:
"Voltage"
(Assume water is flowing horizontally so gravity isn't a factor) - (answer)Electric potential is equivalent to
pressure and the voltage (or voltage drop/potential difference) is the difference in pressure between two
points.
, CWEA E1 – Verified Study Guide (2026/2027 A+ Edition)|Complete
Electrical & Instrumentation Exam
Hydraulic Term:
"Current" - (answer)Equivalent to a hydraulic volume flow rate; that is the volumetric quantity of flowing
water over time.
Ohm's Law - (answer)Current through a conductor between two points is directly proportional to the
voltage across the two points.
S.O.P. - (answer)Standard operating procedure.
N.E.C. - (answer)National Electrical Code.
N.F.P.A. - (answer)National Fire Protection Association
NPT - (answer)National pipe thread. Tapered pipe.
Compound Gauge - (answer)Displays negative AND positive pressure measurements
Cat1 Meter - (answer)Measures electronics
Cat2 Meter - (answer)Measures single-phase receptacles.
Cat3 Meter - (answer)Measures 3 phase distribution and single phase lighting equipment.
Cat4 Meter - (answer)Measures 3 phase at utility connection and any outdoor connections.
L.O.T.O. - (answer)Lock out tag out is an osha regulation.
