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Electrical Inspections Contains discussions about electrical systems. This includes receptacles, panels, wiring, etc.

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Old 1/21/14, 5:34 PM
Mark S. Tyson Mark S. Tyson is offline
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Default Stumped on discoloration

Today's inspection circa 2001. 200 amp Siemens 42 circuit panel with 35 of the available circuits being utilized. All 8 of the 2-pole 240v breakers were stacked left and the 19 single pole 120v breakers on the right side. Unable to determine connection to earthen ground connection as the grounding electrode was not exposed (covered over with poured concrete side walk servicing garage man door.
This is a back to back service (first point of disconnect) located in the garage with neutrals and grounds sharing the same bars. Upon removing the dead front cover observed that all of the bare ground wires were blackened, but the neutrals and load carrying branch circuit wiring had not been affected. Opened GFCI outlets within the garage and no discoloration was observed at these devices.
While realizing that load balancing is not really that big of a deal on a residential service it is not common to see all of the single pole and 2-pole breakers stacked?
Can not verify earthen ground? Home is located on brackish waterway, irrigation water provided by public utility. No other blackening of copper wire observed at various other devices within the home and no discoloration of other wiring within the panel kinda rules out a type of environmental contaminate? I am stumped
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  #2  
Old 1/21/14, 6:10 PM
Jim Port Jim Port is offline
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Default Re: Stumped on discoloration

It is typical to see that where the cable has gotten wet.
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Old 1/21/14, 6:28 PM
Mark S. Tyson Mark S. Tyson is offline
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Default Re: Stumped on discoloration

Quote:
Originally Posted by Jim Port View Post
It is typical to see that where the cable has gotten wet.
Are you thinking that perhaps the home was not dried in before electric rough; that because the current carrying conductors would not have been stripped for landing at this point and therefore would not have be affected by exposure to moisture



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M Tyson construction LLC
Tyson Home Inspections

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  #4  
Old 1/21/14, 6:33 PM
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Sean Fogarty Sean Fogarty is offline
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Default Re: Stumped on discoloration

Isnt it humid if FL. Not being a smart azz but just sayin. Some darkening of bare copper wiring is common IMO in areas that are suject to outdoor envirometal conditions. A open garage would be no different.






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Old 1/21/14, 6:52 PM
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Roy D. Cooke, Sr Roy D. Cooke, Sr is offline
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Default Re: Stumped on discoloration

also looks like white wire used on a 240 volt circuit should be painted or taped, black



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Old 1/21/14, 7:03 PM
Bradley K. Toye Bradley K. Toye is offline
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Default Re: Stumped on discoloration

Underground service?



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Old 1/21/14, 7:37 PM
Mark S. Tyson Mark S. Tyson is offline
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Default Re: Stumped on discoloration

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Originally Posted by btoye View Post
Underground service?
Yes underground service



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M Tyson construction LLC
Tyson Home Inspections

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Florida Licensed Home Inspector #1824
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  #8  
Old 1/21/14, 7:44 PM
Mark S. Tyson Mark S. Tyson is offline
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Default Re: Stumped on discoloration

Quote:
Originally Posted by rcooke View Post
also looks like white wire used on a 240 volt circuit should be painted or taped, black
Roy,

Your correct, but until March 1st 2002 Building Officials had description as to when they adopted new code articles.As this prorpetty was permitted before FBC 2002 am unable to confirm



Mark S. Tyson

M Tyson construction LLC
Tyson Home Inspections

Certified General Contractor #1516843
Florida Licensed Home Inspector #1824
Member N.A.C.H.I.
IAC2 certified
Member Florida Building Officials Association
http://www.TysonHomeInspections.com
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  #9  
Old 1/21/14, 10:18 PM
Bradley K. Toye Bradley K. Toye is offline
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Default Re: Stumped on discoloration

Quote:
Originally Posted by mtyson View Post
Yes underground service
Try post #8 in this thread and see if it makes sense to you, makes sense to me.

http://www.nachi.org/forum/f73/wire-corrosion-87637/



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