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10-08-2007, 11:15 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,834
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Architectural Electrical Symbols
Architectural Electrical Symbols used in house (dwelling) construction
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10-09-2007, 06:15 PM
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Handyman
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Join Date: Nov 2006
Location: Upstate, NY
Posts: 144
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Great drawings. Many folks don't know these symbols.
Thanks!
__________________
No, that's not me in the avatar. I just like the picture. 
Last edited by Speedy Petey; 10-09-2007 at 09:48 PM.
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10-14-2008, 06:39 PM
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New Member
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Join Date: Oct 2008
Posts: 2
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Hello, I have a silly Question how come some pannel box's have the neautrial bar grounded and some have the ground side . grounded?
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10-14-2008, 11:28 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,834
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When you have a SERVICE ENTRANCE PANEL the neutral is always bonded to the enclosure by means of a bondingscrew (green) OR A neutral bonding jumper. - in the case of a sub panel the neutral bar is not bonded to the enclosure but there is an auxillary ground strip that is fastened to the enclosure. The theory is that objectionable current - fault current - is routed to earth ground whenever there is a short or a leakage path to ground. The purpose is to have the fault take a more direct path to ground and trip the breaker or blow a fuse eliminating a hazard. A motor winding can develop a fault path through its enamelled insulation and ground itself to its metal case but because of a high resistance may not blow a breaker through the neutral wire but enough to energize the ground path because the motor case is grounded the breaker will blow. a motor lead's path is from a hot to the motor winding which is a coil - through the coil to the neutral wire with 120 volts. a break or abrsion in the middle causes a leakage path even tho the neutral is still connected to the coil's exit path.
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10-15-2008, 06:53 PM
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New Member
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Join Date: Oct 2008
Posts: 2
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sorry for all of the silly questions
Can you explain to me what a sub pannel is? I thank you for all of your help . and why is there a differance between the to.
Thank you again , Kimberley  |
10-15-2008, 09:21 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,834
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Service panels
Diagrams of a entrance panel and sub panel
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