Birds and corrosion

[ptonsparky]

We are starting with rewiring of a dairy. PVC instead of the EMT.

These didn't even move as he slid in the PVC conduit behind them and strapped it.
We are guessing this was a nesting location at one time or another and the EMT couldn't handle the immediate environment. Good reason to pull that EG.

 

[Tony S]

Disease & Bird Droppings

There are several diseases known to be associated with bird droppings; histoplasmosis, cryptococcosis and psittacosis – all can represent a risk to human health. When cleaning bird droppings in any quantity the affected area should be dampened and treated before removal to prevent the risk of inhalation and infection.

Histoplasmosis
When dried-out bird droppings are disturbed, a cloud of airborne dust carries micro-organisms into the lungs leading to respiratory difficulties.

Cryptococcosis
Contracted from bird droppings in nesting or roosting areas or wherever there are bird droppings and can result in flu like symptoms, a fever or in extreme cases, death.

Ornithosis
One of the most commonly found diseases it is transmitted by birds such as pigeons and is known as Ornithosis. A flu type disease, fatalities can occur as with normal influenza viruses.

Campylobacterosis
A bacterial infection contracted via ingestion or contact of guano or guano dust. It causes diarrhoea or dysentery syndrome, mostly but can also include cramps, fever and pain.

 

[ptonsparky]

Disease & Bird Droppings

There are several diseases known to be associated with bird droppings; histoplasmosis, cryptococcosis and psittacosis – all can represent a risk to human health. When cleaning bird droppings in any quantity the affected area should be dampened and treated before removal to prevent the risk of inhalation and infection.

Histoplasmosis
When dried-out bird droppings are disturbed, a cloud of airborne dust carries micro-organisms into the lungs leading to respiratory difficulties.

Cryptococcosis
Contracted from bird droppings in nesting or roosting areas or wherever there are bird droppings and can result in flu like symptoms, a fever or in extreme cases, death.

Ornithosis
One of the most commonly found diseases it is transmitted by birds such as pigeons and is known as Ornithosis. A flu type disease, fatalities can occur as with normal influenza viruses.

Campylobacterosis
A bacterial infection contracted via ingestion or contact of guano or guano dust. It causes diarrhoea or dysentery syndrome, mostly but can also include cramps, fever and pain.

Good information. We will keep that in mind

 

[Cow]

We use emt almost exclusively in the metal freestall barns around here. It's very hot and dry though. We also run the conduit along the middle of the purlin and not at the bottom, to avoid the bolt heads.

I haven't seen the kind of corrosion you're showing, even in the barns our shop wired 19 years ago. I only see a touch of rust at the corners of the 4 sq boxes or similar where the galvanize didn't quite do it's job.

PVC is tough though, because it needs to be strapped so often, and requires many exp fittings in the long runs encountered in the typical dairy barn. Then when using pvc 2 hole straps, they are prone to break after a few years, especially in horizontal application with birds. I was always concerned the pvc conduit would unzip from the ceiling after a few straps in a row broke.

I think the last time we used pvc(not by choice), we used slightly oversized 2 hole metal straps so there was still room for expansion and contraction. In long runs, we'd use one tight fitting 2 hole strap between expansion fittings to hold the conduit in place with the rest being loose oversized 2 hole straps.

 

[ptonsparky]

Some of the areas were no longer being repaired because the conduit was so bad. We removed wires from the breakers. No lights. No fans at times.

Buildings are twenty years and older. This is the only area of seven free stalls that actually has an EG. The rest have, or had at one time, rods.

These are Arlington straps that click around the conduit when it’s pushed into place. I hope they hold up. The PVC two hole are a wasted effort.