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#1
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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. |
#2
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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? |
#3
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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 |
#4
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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? ;-) |
#5
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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! |
#6
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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 |
#7
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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 |
#8
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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. |
#9
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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 |
#10
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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 |
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