what is a prime mover?

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in the wind

Member
Taking NYC electricians exam Saturday 2-3-07 came across this question:

What is the voltage of a battery suppling power to a prime mover without overcurrent protection?

Thanks for your help!
 
S

smith tool

Member
Location
northern Oklahoma
Colorado masters renewal

Colorado masters renewal

had the same section.
Prime movers shall not be solely dependent on a public utility gas system for their fuel supply unless:
(a) it is accaptable to the authority having jurisdiction.
(b) the gas system is listed.
(c) the gas system and electrical utility are jointly owned.
(d) there is a probability of a simultaneous failure of both gas and electrical systems.

I cant get over this site! very addictive...later, John
 
J

jimaloneu8

Member
john,
looked at your question, the only answer that made sense to me was listed (a)
am i overlooking something hidden?
 
M

mthead

Senior Member
Location
Long Beach,NY
what is a prime mover

what is a prime mover

Remember, when taking this type of test you are often given more info in the question than is required for the actual answer.
It would seem to me that the que stion is not about a "prime mover".
It is asking what is the battery voltage.
Battery voltage is figured at 2v per cell for lead -acid type or 1.2 per cell for alkalai type..
Read between the lines
 
J

jimaloneu8

Member
smith tool question

smith tool question

I am confused now, I thought we were talking about question from smith tool guy. That question had nothing to do with battery just about gas supply for primary mover. Did i miss something?
 
robbietan

robbietan

Senior Member
Location
Antipolo City
What is the voltage of a battery suppling power to a prime mover without overcurrent protection?

this could be 24V dc, as those diesel engines run like those truck engines. we have diesel prime movers in 30MW gas turbines also, and they have a 24V dc supply from batteries (lotsa them) so the turbine could do a black start...
 
J

jimaloneu8

Member
question answer smith tool guy

question answer smith tool guy

this is great being old, retired and still confused on gas supply question on prime mover.
anyway love looking at this site. thanks everybody!
 
C

carter3933

Member
Location
North Carolina
Smith tool question

Smith tool question

smith tool said:
had the same section.
Prime movers shall not be solely dependent on a public utility gas system for their fuel supply unless:
(a) it is accaptable to the authority having jurisdiction.
(b) the gas system is listed.
(c) the gas system and electrical utility are jointly owned.
(d) there is a probability of a simultaneous failure of both gas and electrical systems.

What would be the answer to this?

700-12 (B)(3) Exception lists both a and d.
Click to expand...
 
D

davizaud

Member
colorado prime mover

colorado prime mover

I moved to answered A. In the exception, it states a "low" probability which is why I didn't like said answer D. Thanks for the help. Dave.
 
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