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Scope of 300.5 (D) (3) #122582
12/02/05 11:01 PM
12/02/05 11:01 PM
electure  Offline
Joined: Dec 2000
Posts: 4,264
Fullerton, CA USA
300.5 (D)(3) Requires a warning ribbon at least a foot above unencased service conductors that are buried more than 18" deep.
Don't you think that this should be required on other underground installations as well?

[Linked Image]

Tools for Electricians:
Re: Scope of 300.5 (D) (3) #122583
12/02/05 11:08 PM
12/02/05 11:08 PM
skingusmc  Offline
Joined: May 2004
Posts: 116
Simi Valley, CA USA
You mean this isn't a "warning" to AHJs? (grin)


Re: Scope of 300.5 (D) (3) #122584
12/03/05 04:08 AM
12/03/05 04:08 AM
Trumpy  Offline

Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Did you get that strip from the local cemetary?. [Linked Image]

Re: Scope of 300.5 (D) (3) #122585
12/03/05 04:33 PM
12/03/05 04:33 PM
renosteinke  Offline
Cat Servant
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I think the proper cite(s) would be 90.2 and 90.4.
(Especially in regards to enforcing non-existant requirements or the use of no-existant equipment).

Re: Scope of 300.5 (D) (3) #122586
12/03/05 07:58 PM
12/03/05 07:58 PM
e57  Offline
Joined: May 2003
Posts: 2,876
Upon finding this tape in the ground do you hand dig, or continue with a back-hoe?

Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: Scope of 300.5 (D) (3) #122587
12/05/05 07:53 PM
12/05/05 07:53 PM
electure  Offline
Joined: Dec 2000
Posts: 4,264
Fullerton, CA USA
OK, maybe the example is a little silly, but I think my question is a valid one.

Why should it be a requirement to put a warning ribbon above a 100 Amp residential 120/240 Volt service lateral, maybe fed by a 25 KVA transformer, when there's no requirement to provide the same type of warning above a 1000 Amp 480 Volt feeder?

Is my reasoning even goofier than usual? What am I missing here?

Re: Scope of 300.5 (D) (3) #122588
12/05/05 08:24 PM
12/05/05 08:24 PM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
IMO your right, it makes no sense to me that this only applies to service conductors.

Bob Badger
Construction & Maintenance Electrician
Re: Scope of 300.5 (D) (3) #122589
12/05/05 08:28 PM
12/05/05 08:28 PM
HLCbuild  Offline
Joined: Dec 2004
Posts: 209
Herndon,Va USA
You guys are thinking too much again!

Re: Scope of 300.5 (D) (3) #122590
12/06/05 09:37 AM
12/06/05 09:37 AM
sandsnow  Offline
Joined: Sep 2004
Posts: 167
Irvine, CA, USA
Read 300.5(D) It is refering to direct buried conductors and cables. This does not apply to service conductors or laterals in conduit.

I've never heard of any direct buried cables encased in concrete though.

I agree that UG conductors in general need more attention from the code in regards to protection.

Larry LeVoir
City of Irvine, CA
Re: Scope of 300.5 (D) (3) #122591
12/06/05 01:54 PM
12/06/05 01:54 PM
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
It also doesn't make any sense that this only applies to condutors installed in a trench, not those installed by directional boring.

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