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Well disco #101475 03/23/07 03:08 PM
Joined: Mar 2002
Posts: 179
derater Offline OP
After seeing a few water well circuits landed at discos in a pit or shed, it occurred to me (duh), that the 'in sight of' rule applies here. A customer has one (fuse box) that's had it, and likely pre-dates the 200a service panel. Questions are; is 'in sight' required and must it be fused or is a pullout ok?

2017 / 2014 NEC & Related Books and Study Guides
Re: Well disco #101476 03/23/07 03:36 PM
Joined: Jul 2004
Posts: 9,541
gfretwell Offline
It does not need to be fused. A motor rated snap switch would work if it was rated for the HP of the pump. (not uncommon with small house pumps)
The "in site" thing usually has a bit of wiggle room in it. Just look at the intent. You don't want someone coming up and flipping the switch while you are working on it. I have also heard this referred to "as far as you can accurately throw your Kliens". You don't need to see the switch itself but you need to be able to see someone screwing with it.
A lockout capable disconnect will also work, wherever it is, although that is not my favorite method since LoTo is a foreign concept to too many people in the service business.

Greg Fretwell
Re: Well disco #101477 03/23/07 04:27 PM
Joined: Jun 2005
Posts: 821
ShockMe77 Offline
NEC Article 100 Definition of "within sight, in sight from", or "within sight" is to be visible and not more than 50'ft distant from the other. If the equipment requires a disconnect and one is not visible ("within sight"), and more than 50ft away, it violates NEC requirements.

Re: Well disco #101478 03/23/07 04:37 PM
Joined: Jan 2003
Posts: 4,391
iwire Offline
I assume we are talking about a submersible well pump?

That would need a disconnect per 430.102(B).

However check out the exception, specifically (b).

It basically says the disconnect does not have to be in sight if it can't be in sight. wink

Bob Badger
Construction & Maintenance Electrician
Re: Well disco #101479 03/23/07 04:52 PM
Joined: Jan 2004
Posts: 1,507
George Little Offline
Check out the definition of the word "impracticable" as compared to "impractical" as used in 430.102(B) Exception (a). You might be surprised.

George Little
Re: Well disco #101480 03/23/07 05:38 PM
Joined: Jan 2003
Posts: 4,391
iwire Offline
I am not surprised, I was counting on it. smile

im·prac·ti·ca·ble (ĭm-prăk'tĭ-kə-bəl)

Impossible to do or carry out: Refloating the sunken ship intact proved impracticable because of its fragility.
It is imposable for the disconnect to be in sight from an underground motor. smile

Bob Badger
Construction & Maintenance Electrician
Re: Well disco [Re: iwire] #160752 03/25/07 11:38 AM
Joined: Jul 2004
Posts: 9,541
gfretwell Offline
I think for the purposes of this discussion we are talking about within sight of the J box where the well tech will be disconnecting the wires going down the pipe.
Our plumbing can be above ground here so you usually have the RNC coming out of the ground on a post, that will carflex over to the box on the well head. If you have a motor rated switch on the post and the final connection is made in the box at the well head the rule is fulfilled. The other way this is done is to have the disconnect in the box on the side of the house where the RNC goes down. That is where mine is (actually in a pump shelter for the "house pump", bladder tanks and control equipment.)

Greg Fretwell


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