After energizing NEW high voltage cable or equipment in an underground structure how long must you wait before entering that structure?
Minimum of 5 minutes.
- APM RULE 303. Energizing equipment.
What’s the maximum amount of secondary runs are you allowed in a mini pad?
A max of 6 services and no more than 2 streetlight runs on top of that.
DUG TX 190
How many amps can you break with load break elbows?
200 amps
DOM CC 5 pg.1
How many operations is a load break elbow good for? And how do you know if it’s been operated too many times?
They are designed to only be pick up load or break load of 200 amps a maximum of ten times.
Most operations are under a lot less load so the only way to tell if the elbow is good to operate is to check the pin.
DOH CC-5 pg. 1
What is a VFI? And where is it used?
- Vacuum fault interrupter. VFI’s consists of a 600 amp load interrupting switch and a 600 amp fault interrupting switch
- its primarily used for large customer transformer installation. Transformers larger than 1500kva.
- VFI’s are used where PME or PMH were.
- DUG PD 318.1
If you are behind power fuses, at what fault duty amps can you operate load break elbows?
If you are behind power fuses you can operate load break elbows if the the fault duty is below 10000 amps.
*DOM CC-5 pg 10
If you are behind current limiting fuses, at what fault duty amps can you operate load break elbows?
As long as you are behind CLF you can operate load break elbows at any fault duty.
DOM CC-5 pg 10
When heat scanning cable, from the component how much of the cable must you heat scan?
At least 3 feet down the the cable from the component.
DOM TE PG 2
Between component and cable what temperature difference makes the component a priority one to replace?
40 degrees above the cable
- TDBU Other Confined Space Manual 5(Cg-4)
At what temperature difference between cable and component makes the component a priority one to be changed out?
Above 40 degrees
*** DIMP CG-4
At what temperature between cable and component determines a priority one?
Component 40 degrees above cable determines a priority one
** DIMP CG-4
At what temperature difference between cable and component determines a priority two?
Component 10-39 degrees difference between cable determines a priority 2
*** DIMP CG-4
At what temperature of cable ( just cable ) determines a priority one?
240 degrees
At what temperature of cable ( just cable ) determines a priority two?
175 degrees
What describes a RAJ switch?
1st position solid to the bus
2nd position and 4th position can be open, closed, or tie
3rd position is solidly connected to the tie position.
** 3rd step book underground switches pg 14
When is a vault blower required?
When there is a transformer in a vault at 225 KVA or higher.
**DUG VE 100.1
At what temperature must a transformer be changed out?
265 degrees
** DOM TE-5 table 1
Can you build an open delta bank with 6.9 burds?
No because 6.9 burds are internally grounded
One ground is ok two grounds is bad
What size fuses are in 6.9 burd switch?
Two 40 amp fuses
What size fuses do you put in a 6.9 fuse dip?
80 amp fuses
At what kva does the padmount case ground change to 2/0?
500kva
At what temperature between cable and component should you not enter a vault?
20 degrees
*** DOM IM-5 C last paragraph I
In a load break fuse cabinet what side (line or load) must you load make or load break ooerations
the load side always for all load making or load breaking operations.
How can you tell what type of fusing in a pme?
Location of bolts, if they’re high it’s CLF if they’re low power fuses
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random need to knows87
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Switchs/switching18
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Grounding12
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Tools/equipment9
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2nd Step Questions89
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Rigging7
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Transformers11
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Underground25
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Substation4
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Theory17
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Amperages42
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Dead End Tensions20
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3rd Step46
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3rd Step Test Sudy Guide34
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4th Step Study Guide62
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5th step5
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Capacitor Banks0
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5th Step Questions19
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6th Step9
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Apm rules46
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meter and service requierments10
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OH construction60
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1st step questions116
