QUESTION FOR AN ELECTRICIAN
 

I own a gas station that was remodeled about 20 years ago. When it was wired up,
in the specs for the dispenser wiring it was required for the power to the
dispensers and the dispenser lights to have single pole breakers that break the
hot and the neutral. Does any experienced electrician here know why the
dispenser company (Dresser Wayne) wants both the hot and neutral disconnected
when you shut off the breakers ???? I always wondered what their reasoning was.
The underground submersible pumps use plain old 2 pole breakers--nothing special
like the dispensers.
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.

QUESTION FOR AN ELECTRICIAN
 

On 11/30/2011 7:15 PM, Ron in NY wrote:
I own a gas station that was remodeled about 20 years ago. When it was wired up,
in the specs for the dispenser wiring it was required for the power to the
dispensers and the dispenser lights to have single pole breakers that break the
hot and the neutral. Does any experienced electrician here know why the
dispenser company (Dresser Wayne) wants both the hot and neutral disconnected
when you shut off the breakers ???? I always wondered what their reasoning was.
The underground submersible pumps use plain old 2 pole breakers--nothing special
like the dispensers.
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.

I'm not an electrician nor do I even play one on tv but...

maybe it's because if you lost the neutral connection to the power
company transformer you could see significant voltage on the neutral at
the pump?

QUESTION FOR AN ELECTRICIAN
 

On 11/30/2011 7:15 PM, Ron in NY wrote:
I own a gas station that was remodeled about 20 years ago. When it was wired up,
in the specs for the dispenser wiring it was required for the power to the
dispensers and the dispenser lights to have single pole breakers that break the
hot and the neutral. Does any experienced electrician here know why the
dispenser company (Dresser Wayne) wants both the hot and neutral disconnected
when you shut off the breakers ???? I always wondered what their reasoning was.
The underground submersible pumps use plain old 2 pole breakers--nothing special
like the dispensers.
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.

It's an Nec requirement for fuel dispensing equipment. At a location
remote from the dispenser, a disconnecting means must be provided that
disconnect "all" circuit conductors. The codebook footnote mentions that
this is to guard against any accidental polarity reversal issues where
120 volt equipment is used

QUESTION FOR AN ELECTRICIAN
 

On Nov 30, 7:45*pm, RBM wrote:
On 11/30/2011 7:15 PM, Ron in NY wrote:

I own a gas station that was remodeled about 20 years ago. When it was wired up,
in the specs for the dispenser wiring it was required for the power to the
dispensers and the dispenser lights to have single pole breakers that break the
hot and the neutral. Does any experienced electrician here know why the
dispenser company (Dresser Wayne) wants both the hot and neutral disconnected
when you shut off the breakers ???? *I always wondered what their reasoning was.
The underground submersible pumps use plain old 2 pole breakers--nothing special
like the dispensers.
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.

It's an Nec requirement for fuel dispensing equipment. At a location
remote from the dispenser, a disconnecting means must be provided that
disconnect "all" circuit conductors. The codebook footnote mentions that
this is to guard against any accidental polarity reversal issues where
120 volt equipment is used

RBM:

Have anyone ever told you that you da man? ;-)

QUESTION FOR AN ELECTRICIAN
 

"Ron in NY" wrote in message
Does any experienced electrician here know why the dispenser
company (Dresser Wayne) wants both the hot and neutral
disconnected when you shut off the breakers ????


Because you would be shutting off power so someone could service the
dispensers. And when servicing these dispensers, you would not want
any potential sparking. A neutral under certain malfunction situations
can be energized. That could cause a spark. Thus they are removing
that risk.

Additional protection elsewhere, besides disconnecting all current
carrying conductors, is to also ground them!

QUESTION FOR AN ELECTRICIAN
 

On 11/30/2011 6:57 PM, DerbyDad03 wrote:
On Nov 30, 7:45 pm, wrote:
On 11/30/2011 7:15 PM, Ron in NY wrote:

I own a gas station that was remodeled about 20 years ago. When it was wired up,
in the specs for the dispenser wiring it was required for the power to the
dispensers and the dispenser lights to have single pole breakers that break the
hot and the neutral. Does any experienced electrician here know why the
dispenser company (Dresser Wayne) wants both the hot and neutral disconnected
when you shut off the breakers ???? I always wondered what their reasoning was.
The underground submersible pumps use plain old 2 pole breakers--nothing special
like the dispensers.
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.

It's an Nec requirement for fuel dispensing equipment. At a location
remote from the dispenser, a disconnecting means must be provided that
disconnect "all" circuit conductors. The codebook footnote mentions that
this is to guard against any accidental polarity reversal issues where
120 volt equipment is used

RBM:

Have anyone ever told you that you da man? ;-)

RBM's depth of electrical knowledge is shocking. ^_^

TDD

QUESTION FOR AN ELECTRICIAN
 

On 12/1/2011 12:10 AM, Bill wrote:
"Ron in NY" wrote in message
Does any experienced electrician here know why the dispenser
company (Dresser Wayne) wants both the hot and neutral
disconnected when you shut off the breakers ????


Because you would be shutting off power so someone could service the
dispensers. And when servicing these dispensers, you would not want any
potential sparking. A neutral under certain malfunction situations can
be energized. That could cause a spark. Thus they are removing that risk.

Additional protection elsewhere, besides disconnecting all current
carrying conductors, is to also ground them!


A weird loop voltage or induced current could also exist. If you want to
test a ground fault outlet or breaker, short the neutral to ground
and it will trip. That may be the reason for the fuel dispenser
electrical standards requiring the neutral be disconnected which have
been around longer than the ubiquitous ground fault devices. Of course
the ground/earth connection is always present to drain off any static
charge.

TDD

QUESTION FOR AN ELECTRICIAN
 

RBM wrote:


It's an Nec requirement for fuel dispensing equipment. At a location
remote from the dispenser, a disconnecting means must be provided that
disconnect "all" circuit conductors. The codebook footnote mentions that
this is to guard against any accidental polarity reversal issues where
120 volt equipment is used
================================================== =========
What is the proper name for this type of breaker ???
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.

QUESTION FOR AN ELECTRICIAN
 

On 12/2/2011 7:26 PM, Ron in NY wrote:
wrote:


It's an Nec requirement for fuel dispensing equipment. At a location
remote from the dispenser, a disconnecting means must be provided that
disconnect "all" circuit conductors. The codebook footnote mentions that
this is to guard against any accidental polarity reversal issues where
120 volt equipment is used
================================================== =========
What is the proper name for this type of breaker ???

Ralph

QUESTION FOR AN ELECTRICIAN
 

On 12/2/2011 7:26 PM, Ron in NY wrote:
wrote:


It's an Nec requirement for fuel dispensing equipment. At a location
remote from the dispenser, a disconnecting means must be provided that
disconnect "all" circuit conductors. The codebook footnote mentions that
this is to guard against any accidental polarity reversal issues where
120 volt equipment is used
================================================== =========
What is the proper name for this type of breaker ???
================================================== ======
Remove the ZZZ from my E-mail address to send me E-mail.


Sorry, I couldn't resist. "Switched neutral circuit breaker" Here is a
link to a QO type switched neutral breaker:
http://www.grainger.com/Grainger/SQU...NJ2?Pid=search