DCARI Virtual April 29 2020-Electrical Receptacles

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This test was generated for those who attended the April 29, 2020 class on electrical receptacles, taught by Cameron Novak.

Email *

What is your name? (To be put on your certificate)

Name of your department ? *

What state is your department located in ?

What country are you located in ?

United States

Other:

Clear selection

Thermoset plastics will char and maintain their shape, while thermoplastics tend to melt and flow. *

10 points

True

False

In order to fully examine a receptacle, the investigator should: *

10 points

Examine the screw terminals and/or push-in connections

Examine the power rails and ground yoke

Document and preserve all relevant materials for potential examination by other experts

All of the above

Arc tracking failures are the only failures an investigator needs to look for on a receptacle. *

10 points

True

False

Factors that should be considered in the analysis of a potential ignition scenario involving a receptacle with evidence of arc melting include all of the following, except: *

10 points

The type of plastic the receptacle is made of

The type and location of the hypothesized first fuel(s)

The presence or absence of attached loads

The color of the receptacle body

NFPA 921 does not provided guidance on the difference between intrusive and destructive examinations. *

10 points

True

False

The primary components of interest of a receptacle are: *

10 points

Power rails

Ground yoke

plastic body

Both a and b

An arc tracking failure is likely to have heavily localized damage between the arc sites on the ground yoke and power rail, even in the presence of damage from fire impingement. *

10 points

True

False

If an energized item is plugged into a receptacle, the power cord to the item is the most likely area for the presence of an arc site because it is exposed to the fire event before the receptacle or associated branch circuit wiring. *

10 points

True

False

When an energized item undergoes direct flame impingement, the arc failures typically occur as a result of the gradual buildup of resistance or current flow, not a short duration arcing event such as arcing through char or direct contact of energized components. *

10 points

True

False

GFCI receptacles can present unique arc damage because: *

10 points

The GFCI protection always activates too quickly and evidence of arc damage is never observed

Once the GFCI protection activates, receptacle components that were once ungrounded (hot) may now be at a different potential, allowing them to arc to each other

The GFCI receptacle is made of such lightweight plastics that fire can penetrate into the receptacle before it could cause arcing in the power cord of an attached load

There are no unique concerns for GFCI receptacles

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