bonding chase nipple

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elect4

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if you have 3 3inche p.v.c service pipes coming into the back of a trough and the trough is mounted to the side of a 1000 amp switchboard by bolts,nuts,and 3-3inch chase nipples with fiber bushings does the nipples have to have bond bushings and the bare 3/0 delta ground comes thru there also with a chase nipple even though the board is grounded
 
elect4 said:
if you have 3 3inche p.v.c service pipes coming into the back of a trough and the trough is mounted to the side of a 1000 amp switchboard by bolts,nuts,and 3-3inch chase nipples with fiber bushings does the nipples have to have bond bushings and the bare 3/0 delta ground comes thru there also with a chase nipple even though the board is grounded


All metal service raceways require bonding bushings... Check out 250.92
 
Last edited:
stickboy1375 said:
All metal service raceways require bonding bushings... Check out 250.92

Here while stick fumbles for the pic/Image, let me add they make insulated grounding bushing... & what could be a nicer place to bond.:roll:
 
even though the chase nipple is in direct metal to metal contact with both enclosures it still needs it because a regular lockring isn't an approved means or ???
 
elect4 said:
even though the chase nipple is in direct metal to metal contact with both enclosures it still needs it because a regular lockring isn't an approved means or ???


It is a raceway and it contains service conductors.

It is required to be bonded.

They do make bonding bushings that can be installed after the cables are in place but they are not cheap.
 
Are chase nipples permitted to enclose service entrance conductors? If so what would they fall under on this list?

230.43 Wiring Methods for 600 Volts, Nominal, or Less.
Service-entrance conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods:
(1) Open wiring on insulators
(2) Type IGS cable
(3) Rigid metal conduit
(4) Intermediate metal conduit
(5) Electrical metallic tubing
(6) Electrical nonmetallic tubing (ENT)
(7) Service-entrance cables
(8) Wireways
(9) Busways
(10) Auxiliary gutters
(11) Rigid nonmetallic conduit
(12) Cablebus
(13) Type MC cable
(14) Mineral-insulated, metal-sheathed cable
(15) Flexible metal conduit not over 1.8 m (6 ft) long or liquidtight flexible metal conduit not over 1.8 m (6 ft) long between raceways, or between raceway and service equipment, with equipment bonding jumper routed with the flexible metal conduit or the liquidtight flexible metal conduit according to the provisions of 250.102(A), (B), (C), and (E)
(16) Liquidtight flexible nonmetallic conduit
 
infinity said:
Are chase nipples permitted to enclose service entrance conductors? If so what would they fall under on this list?
I'd say #3, a nipple with one locknut factory-installed.
 
infinity said:
Are chase nipples permitted to enclose service entrance conductors? If so what would they fall under on this list?

I agree with Dennis, they are UL listed as conduit fittings.


CONDUIT FITTINGS (DWTT)
USE
This category covers metallic and nonmetallic conduit fittings, such as
couplings, conduit bodies, short radius conduit bodies, expansion fittings,
locknuts and connectors for use in the assembly of nonmetallic and metallic
wiring systems. Also covered are fittings used to provide a transition
between metallic and nonmetallic wiring systems. All fittings are intended
to be installed in accordance with ANSI/NFPA 70, ??National Electrical
Code?? (NEC), and are intended for installation and use in accordance with
the following information and the limitations specified in the appropriate
conduit or tubing category.
Some of these fittings are also suitable for use in certain hazardous (classified)
locations where unclassified (ordinary) locations fittings are permitted
in Articles 501, 502, 503, 505 and 506 of the NEC.

This category also includes metal bushings for use in conduit and insulating bushings for use on conduit inside boxes, gutters, etc.
 
Here's the definition if RMC:

344.2 Definition.
Rigid Metal Conduit (RMC). A threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings. RMC is generally made of steel (ferrous) with protective coatings or aluminum (nonferrous). Special use types are red brass and stainless steel.


Doesn't sound like a chase nipple to me.
 
infinity said:
Doesn't sound like a chase nipple to me.

Think of a chase nipple as a very short piece of threaded pipe with a flare on the end.

It is a threaded raceway. What part of the definition don't you agree with.
 
infinity said:
Doesn't sound like a chase nipple to me.

Doesn't sound like an LB to me, but we use LBs in service ways. :)

Both chase nipples and conduit bodies are listed as conduit fittings. :smile:
 
Dennis Alwon said:
Think of a chase nipple as a very short piece of threaded pipe with a flare on the end.

It is a threaded raceway. What part of the definition don't you agree with.


"A threadable raceway".
 
Dennis Alwon said:
I see now... but I still think it is acceptable


I'm not saying that it's not acceptable, but IMO if it's a raceway than it must comply with the methods listed in 230.43. I have a problem with it being "(3) Rigid metal conduit" since it cannot be threaded and therefore does not meet the definition of RMC in 344.2. If it's actually a fitting then I agree with Bob's thought. So the question is, what is it?
 
IMO it is a fitting.

230.43 Wiring Methods for 600 Volts, Nominal, or Less.
Service-entrance conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods:

(5) Electrical metallic tubing

That says I can use EMT, it does not say I can use EMT couplings or connectors.

To me that is exactly the same as using a conduit fitting or conduit body.
 
inspector says that they do not need bond bushings since trough is bonded to switchboard by mech means being bolts and nuts and switchboard is bonded. he says if it wasn't bolted up and chase nipple was only mean of connection then it would need bond bushing---any thoughts on that on way thats not agreeable
 
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