Wiring color code
in a 240v single phase system what color is l1 and l2
Green or green yellow
What color is ground
green or green yellow
What is dangerous event occurs when electricity jumps through air and releases intense heat and light.
arc flash
What is dangerous event occurs when electricity jumps through air and releases intense heat and light.
is dangerous event occurs when electricity jumps through air and releases intense heat and light.
What is the phase to phase voltage for a 208 v system
208v
In a 208 V system what color is l3
Blue
True or false in a grounding system all grounds should be continuous to earth ground
True
What is he purpose of an interlock
to prevent machine operation unless certain conditions are met
What is the purpos of the nfpa70e
to prevent electrical fires
How do you verify ground continuity
Put your multimeter in continiuity mode and verify all grounds are continous by probing all ground connections to earth ground and listening for the beep
In a 480 V system what color is l1,l2,l3
Brown orange yellow
How would you test to see if you had a ground fault aka a short to ground
you would test the wire you think has a short for continuity to ground
True or false Control circuits can be grounded or ungrounded
True
what is the safest condition to work on electrical equipment
de energized
What is the phase to ground voltage in a 208 v system
120v
In a 120 v system what color is neutral,L1 and ground
white black green
What is the the purpose of grounding
to prevent electrical sock by providing a safe path for ground current
Emergency stops must be initiated by
A single human action
what is lockout tagout and how do you perform it
It is the process of turning of the machine and locking it out preventing unintentional operation the purpose of the tag is to make known who locked the machine and for what purpose
What is the maximum ac control voltage
120v
In a 24 v system what color would be your 24 vpower and what color would be your 0v
blue /blue white
Condctors used for grounding should be made out of what material
copper
Operator controls shall be located to avoid what
unintentional operation
Name 3 appropriate ppe for arc flash hazards
balaclava
face shield
arc rated clothing
rubber gloves
arc rated gloves
composite toe shoes with rubber soles
Why must ground continuity be uninterrupted
to prevent electrical shock fault current must have a direct path to earth ground