W.E.L.L. week 1 Flashcards
current takes ……….. paths to groun
all
how much current can cause serious damage or to hearts rythm?
1/3 of an amp
recognised condition of line section, equipment that has been deenergized by all sources?
clearance
a clearance point that can be ………. is always prefered
locked
not specifically required by OSHA ……………….. is preferred by many companies
visual clearance point
any device, connector, or open that is used to connect the line or piece of equipment from a possible source of energy is called a
clearance point
types of clearance points are?
visual and non visual
a …………….. clearance point is preffered by OSHA but not required
visual
why is a visual clearance point preffered?
provides a more safe and secure clearance
once the line has been open, locked and tagged it is considered to be?
disconnected
open jumpers are utilized as ……………… on both primary and secondary circuits
clearance points
reclosers are used as?
clearance points
a ……………………………. can be fused and solid and used as a clearance point
single blade disconnect
some switches have means of installing a ………… to prevent the switch from opening
lock
how to protect against induction?
ground it
best way to protect self against lightning?
dont work in it
wait at least ……. min before installing grounds on a disconnect capacitor
5
grounding near the source may require …….. sets of grounds
2
……………………. should be properly sized for the given fault current
grounding equipment
………….. , …………… and …………. help protect employees on the ground
protective grounds, insulating equipment and restricted work areas
OSHA states that devices used as clearance points must be?
rendered inoperable
flying bells are also known as?
span open
warm winds blowing accross conductor can create a
static charge
……….. work involves protection against both normal and abnormal sources of electrical energy
deenergized
when working energized, lineworkers follow three principles to manage current,
insulate, isolate, protect
when clearing lines and equipment there are three major objectives.
ensure safety of employees and public, minimize the negative impact on the electrical system, minimize number of customers out of service
is responsible for accomplishing the work in the field(normally crew leader). a clearance is issued to the clearance holder, and cannot end until the clearance holder releases the clearance.
clearance holder
works at the utilitys operations center and has a system wide perspective and control of the system in real time. this person gives permission for the clearance to occur, can operate devicesremotely, and releases the line or apparatus to the clearance holderso that work can be preformed
system operator
is any employee in the field who is physically operating the apparatus or devices used to disconnect the lines or equipment. this is done at the direction of the system operator. this employee could be a troubleman, switchman, roving operator, station operator or other position
field operator
are gang operated which means the moving parts are connected so that all three phases operate simultaniously with one action by the operator
air switch
…………… occurs when a nearby energy source, such as an energized transmission line - electrifies a disconnected and deenergized conductor or conductive objest
induced voltage
equipment designed to store electricity may retain a charge long after being disconnected
capacitance
