I wonder if it is reading skills, writing skills, or no skills at all....

[Pierre C Belarge]

(QCRV)ul - specifically Reducing Washers.


"Metal reducing washers are considered suitable for grounding for use in circuits over and under 250 V and where installed in accordance with ANSI/NFPA 70 "National Electrical Code." Reducing washers are intended for use with metal enclosures having a minimum thickness of 0.053 in. for non-service conductors only."
(quote from UL White Book)


As I read this, it tells me that reducing washers are not to be installed with service conductors.
Reading the IAEI 2011 Analysis Book, page 107, the author states that, " Reducing washers are evaluated and listed for grounding for non-service conductors only."

I do not read it to say what the author has stated, I read it to say that reducing washers are not suitable for use with service conductors.


What are your opinions?
Does anyone have a link(s) that point to more information about installation of reducing washers?

Thanks

 

[Pierre C Belarge]

Sorry, one other point about reducing washers.

As per 250.12 and 250.96(A), last sentence;

Does a painted surface have to be cleaned for using reducing washers if they are the bonding means?

Thanks again

 

[PetrosA]

I would agree with you. Possibly that period after the inch designation confuses people as they might think they got to the end of a sentence when ready quickly.

 

[north star]

& + + + &

"Sorry, one other point about reducing washers.

As per 250.12 and 250.96(A), last sentence;

Does a painted surface have to be cleaned for using reducing washers if they are the bonding means?"

IMO, yes !


& + + + &

 

[tkb]

& + + + &


IMO, yes !


& + + + &

No see UL White Book

Outlet Bushings and Fittings (QCRV)
Grounding

Metal reducing washers are considered suitable for grounding for use in circuits over and under 250 V and where installed in accordance with ANSI/NFPA 70, ??National Electrical Code.'' Reducing washers are intended for use with metal enclosures having a minimum thickness of 0.053 in. for non-service conductors only. Reducing washers may be installed in enclosures provided with concentric or eccentric knockouts, only after all of the concentric and eccentric rings have been removed. However, those enclosures containing concentric and eccentric knockouts that have been certified for bonding purposes may be used with reducing washers without all knockouts being removed

 

[Pierre C Belarge]

Tim,

It states in the White Book that they are to be installed as per the NEC - 250.12 is specific about cleaning the surfaces.

I do not see where the wording in QCRV does not require one to install them, including the requirements of 250.12.

 

[tkb]

Tim,

It states in the White Book that they are to be installed as per the NEC - 250.12 is specific about cleaning the surfaces.

I do not see where the wording in QCRV does not require one to install them, including the requirements of 250.12.

I never saw that article.
I stand corrected and change my position.
Thanks for the clarification.

 

[kwired]

(QCRV)ul - specifically Reducing Washers.


"Metal reducing washers are considered suitable for grounding for use in circuits over and under 250 V and where installed in accordance with ANSI/NFPA 70 "National Electrical Code." Reducing washers are intended for use with metal enclosures having a minimum thickness of 0.053 in. for non-service conductors only."
(quote from UL White Book)


As I read this, it tells me that reducing washers are not to be installed with service conductors.
Reading the IAEI 2011 Analysis Book, page 107, the author states that, " Reducing washers are evaluated and listed for grounding for non-service conductors only."

I do not read it to say what the author has stated, I read it to say that reducing washers are not suitable for use with service conductors.


What are your opinions?
Does anyone have a link(s) that point to more information about installation of reducing washers?

Thanks

Well considering your thread title and the blue highlighted text -- maybe it was your intention to bring it up maybe not but we use reducing washers for raceways and fittings not for conductors:happyyes:

Are we only supposed to use reducing bushings for service raceways if the hole is too big?

A majority of my service conductors I seem to run are in PVC raceways - I have used washers many times for those but see no issue for that application though it doesn't specifically mention it.

 

[Pierre C Belarge]

The wording in a number of locations throughout the White Book is concise and sparse. I would guess they are trying to keep the document as short as is possible.
I also believe it makes it too difficult to read and understand at times.

In the case of what I have posted, I am not sure what they are really trying to say, so I am reaching out to others for opinions and the possibility they actually may know, via a class or seminar, etc...