Contractor Talk - Professional Construction and Remodeling Forum banner

1 - 20 of 79 Posts

·
Registered
Joined
·
42 Posts
Discussion Starter · #1 ·
Please write if u know the answer 100%. . . .

1)What conduit you must use for exterior wiring
a.Ridgid
b.EMT
c.PVC
d.FMT
2)How much percentage you must remove water from construction side during water storm
a.100
b.75
c.80
d.65
3)In Raceway u have 5 conductors what percentage you must use for ampacity of wires ?
a.50 b.60 c.70 d.80
4)U have supply 480V.Your building need 120/208v 400a service.what size transformer u must use ?
a.150KVA b.200KVA c.500Kva .d.600kva
 

·
Super Moderator
Joined
·
11,936 Posts
I know you always get upset when people who dont know the answers respond you your IMMEDIATE DEMAND FOR ANSWERS.

I am allowed to respond to your post because you said I could only do it if I know the answers. I qualify.

If you would learn to use your NEC and how to find information contained therein, perhaps you wouldn't need to ask us to help you with your homework.

Edit-this site is for the EXCHANGE of information. It's a TWO WAY STREET! What have you CONTRIBUTED to the site?
 

·
#1 stunner
Joined
·
576 Posts
Please write if u know the answer 100%. . . .

1)What conduit you must use for exterior wiring
a.Ridgid
b.EMT
c.PVC
d.FMT

Are you sure you're not missing part of the question??

2)How much percentage you must remove water from construction side during water storm
a.100
b.75
c.80
d.65

Can't remember right off, maybe 65??


3)In Raceway u have 5 conductors what percentage you must use for ampacity of wires ?
a.50 b.60 c.70 d.80

Table 310.15(b)2a states you must use 80%

4)U have supply 480V.Your building need 120/208v 400a service.what size transformer u must use ?
a.150KVA b.200KVA c.500Kva .d.600kva
480V x 400a= 192000VA = 192kva so use 200kva
Someone can check my work...
 

·
Electrical Contractor
Joined
·
2,411 Posts
Please write if u know the answer 100%. . . .

1)What conduit you must use for exterior wiring
a.Ridgid
b.EMT
c.PVC
d.FMT
2)How much percentage you must remove water from construction side during water storm
a.100
b.75
c.80
d.65
3)In Raceway u have 5 conductors what percentage you must use for ampacity of wires ?
a.50 b.60 c.70 d.80
4)U have supply 480V.Your building need 120/208v 400a service.what size transformer u must use ?
a.150KVA b.200KVA c.500Kva .d.600kva
I am 100% sure of my answers:

1) Berlin 1924

2) The Cold War

3) Penicillin

4) Walter Winchell
 

·
I own stock in FotoMat!
Joined
·
12,611 Posts
..........Batik, you need to acclimate to our culture a little.
As well as learn how to write in English.

His OP looks like a Nigerian scam email. :laughing:
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #10 ·
Jarvis Design dot worry and am i am sorry that i put question like thata , but there is a point , because there are peolple they dont know anything and put their stupid ideas , so its not regarding to all ....SO if u know i wanna discus these questions ,,,,,
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #11 ·
Static Design Thanks a lot ......I am in the same mind as you ,,,,but the last question i think like this IF U HAVE SUPPLYY 480V AND U NEED 120/208 400AMP I DID CALCULATION LIKE THIS

480V*AMPinput=208V*AMPoutput => KVA=400A*208=83KVA
CAN U EXPLAIN ME WHERE AM I WRONG ?
 

·
I own stock in FotoMat!
Joined
·
12,611 Posts
.............480V*AMPinput=208V*AMPoutput => KVA=400A*208=83KVA
CAN U EXPLAIN ME WHERE AM I WRONG ?
How can a math equation have THREE equal signs?

Beside the fact that it makes absolutely no sense.
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #15 ·
Ok i agree with you guys ....My english is not good ...and maybe i speake antoher different way but i will fix it ...the main thing that i dont think like that it is my just only speaking way ...but dont worry ,,,after i will put the word "Please" in the and of sentance and i will fix my speaking .....
408 SPARKY i See you are far from away from math this sign => it is not a equal this = sign ....Thios sign => it is math sigh which mens "Means"...i will explain you
18x=36 =>x=36/18=2
Im am saying to all who dont dont i see many of you guys dont know this sign

Now who can help me in my questions ?
 

·
Service & Repairs
Joined
·
4,001 Posts
Please write if u know the answer 100%. . . .

1)What conduit you must use for exterior wiring
a.Ridgid
b.EMT
c.PVC
d.FMT
2)How much percentage you must remove water from construction side during water storm
a.100
b.75
c.80
d.65
3)In Raceway u have 5 conductors what percentage you must use for ampacity of wires ?
a.50 b.60 c.70 d.80
4)U have supply 480V.Your building need 120/208v 400a service.what size transformer u must use ?
a.150KVA b.200KVA c.500Kva .d.600kva

www.MikeHolt.com :thumbsup:
 

·
I own stock in FotoMat!
Joined
·
12,611 Posts
...........
408 SPARKY i See you are far from away from math this sign => it is not a equal this = sign ....Thios sign => it is math sigh which mens "Means"...i will explain you
18x=36 =>x=36/18=2 ............. ?
According to?.............:001_huh:

Or are you trying to make "=>" into "
" which really is the sign for "Material Implication"?
 

·
Service & Repairs
Joined
·
4,001 Posts
)U have supply 480V.Your building need 120/208v 400a service.what size transformer u must use ?
a.150KVA b.200KVA c.500Kva .d.600kva
Alex, I'll go with a 150KVA secondary transformer and I'd like to bet it all.

Learning and understanding three-phase wiring is not the easiest thing. Once you get it you'll never forget it.

The number you need to remember for three-phase is 1.73. That number is the square root of the number 3. It used wherever a three-phase voltage is used. 208, 240, 480, etc.... are all three-phase voltages and the most common ones.

Next, and very important for any "real electrician" to know is Ohm's Law. You can google this and find out what this is on your own.

Long story short... 208 volts x 1.73 = 360. Use this number whenever you need to find a three-phase voltage for 208 volt services.

Next, 360 volts x 400 amps = 144,000 watts, or commonly known in the trade as 144 kilo-volt amps, KVA for short.

Now, since you need at least 400 amps for this service a 150KVA transformer will be needed.

They don't just give out electrical contracting licenses where I live, here they're earned.
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #20 ·
Niceeee Magneticca !! i did the same calculation and u are absolutely right!!!!
and thanks for website ..... Guys i have more questions can i ask please ? :)
 
1 - 20 of 79 Posts
Top