Hey, how bigs that motor?!

[cadpoint]

That's two pairs of 300 Kcmil per.

 

[mgookin]

About 600 human power.

Is that a wastewater plant?

 

[cadpoint]

Yes, WWTP, next county over. This is the largest plant in that county 16 M/Gal. - day ... I forgot.

 

[tom baker]

Does the liquid tight conduit installation to the motor junction box comply with the NEC?

 

[masterinbama]

I would be more concerned with the Polaris connectors on the motor leads. I used some on some 400 HP 480 volt motors and had issues with them.

 

[masterinbama]

Looks like they speced Plastibond and stainless, but let you use galvanized strut and sealtight fittings.

 

[jazer]

Does the liquid tight conduit installation to the motor junction box comply with the NEC?

I'm curious as to why it wouldnt? there are seperate equipment grounding conductors and it looks like it's less than 6'. Perhaps adding a grounding bushing and bond?

 

[cadpoint]

Does the liquid tight conduit installation to the motor junction box comply with the NEC?

I don't know, care to illuminate what is the problem?

 

[darekelec]

I don't know, care to illuminate what is the problem?

350.30 Securing and Supporting. LFMC shall be se-curely fastened in place and supported in accordance with350.30(A) and (B).
(A) Securely Fastened. LFMC shall be securely fastenedin place by an approved means within 300 mm (12 in.) ofeach box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not toexceed 1.4 m.

I guess exceptions do not apply because flexibility is not needed.

Changeover method may bother some.

 

[cadpoint]

Good Points, only light wipes get the free 6'.

 

[kwired]

I would be more concerned with the Polaris connectors on the motor leads. I used some on some 400 HP 480 volt motors and had issues with them.

They sometimes seem to not take the heat in my experiences - don't know what their temp rating is. They also not likely rated for the presumed to be fine stranded motor leads.

 

[Fulthrotl]

350.30 Securing and Supporting. LFMC shall be se-curely fastened in place and supported in accordance with350.30(A) and (B).
(A) Securely Fastened. LFMC shall be securely fastenedin place by an approved means within 300 mm (12 in.) ofeach box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not toexceed 1.4 m.

I guess exceptions do not apply because flexibility is not needed.

Changeover method may bother some.

if it was an issue, i'd take a piece of back to back strut,
and put two straps holding the strut to the stiffener legs,
then strap the sealtight to the strut... put it about where
the vent is on the pump casing.

 

[Cow]

if it was an issue, i'd take a piece of back to back strut,
and put two straps holding the strut to the stiffener legs,
then strap the sealtight to the strut... put it about where
the vent is on the pump casing.

I think that would be a good idea, I've seen my fair share of flex pulled out of the connectors on big motors like these when it was left to hang like that with no supports.

 

[kwired]

I think that would be a good idea, I've seen my fair share of flex pulled out of the connectors on big motors like these when it was left to hang like that with no supports.

Then the rodents, birds, insects move in and cause destruction.

 

[tom baker]

In my classes I make the comment that we often use LFMC where flexibility is not needed, but to make our job easier. The conduits could of been piped right to the motor job box.
Nearly all of us have run LFMC unsupported. But the code is the code. Here a picture of two mag flow meter transmitters using non metallic flex. I did the best I could on support.