Architectural Electrical Symbols

[HayZee518]

Architectural Electrical Symbols used in house (dwelling) construction

[Speedy Petey]

Great drawings. Many folks don't know these symbols.

Thanks!

[Kimberley Johnson]

Hello, I have a silly Question how come some pannel box's have the neautrial bar grounded and some have the ground side . grounded?

[HayZee518]

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.

[Kimberley Johnson]

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

[HayZee518]

Diagrams of a entrance panel and sub panel