DEW202001
Member
- Location
- ODENTON, MD
Can someone describe what ferromagnetic is?
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Ferromagnetic
- Thread starter DEW202001
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mgookin
Senior Member
- Location
- Fort Myers, FL
For an inspector from Odenton? Sure thing. I'm from (but gone from for 35 years) Pasadena and a retired inspector myself.
Ferro meaning ferrous or containing Fe (iron).
Ferro magnetic means in the case of a relay a coil producing a magnetic field when voltage passes through it and that magnetic field moves a ferrous contact.
A ferromagnetic relay. Is that what you meant?
edit: Welcome to the forums.
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junkhound
Senior Member
- Location
- Renton, WA
- Occupation
- EE, power electronics specialty
Hmm, interesting question from an 'inspector' ?
I'm now thinking maybe should add some definitions that a paramagnetic is a county employee who rides around in a truck with flashin' lights looking for bad relays in traffic lights; or, maybe someone who wires up the MRIs in the hospital ?
And then there is the diamagnetic, who specializes in insulin pumps ?
I'm now thinking maybe should add some definitions that a paramagnetic is a county employee who rides around in a truck with flashin' lights looking for bad relays in traffic lights; or, maybe someone who wires up the MRIs in the hospital ?
And then there is the diamagnetic, who specializes in insulin pumps ?
K8MHZ
Senior Member
- Occupation
- Electrician
Nickel and cobalt are also ferromagnetic.
From Wiki:
Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.
Only a few substances are ferromagnetic. The common ones are iron, nickel, cobalt and most of their alloys, some compounds of rare earth metals, and a few naturally-occurring minerals such as lodestone.
K8MHZ
Senior Member
- Occupation
- Electrician
Copper and aluminum both can be wound into a coil and be made into an electromagnet. Since they don't stay permanently magnetized, they are not ferromagnetic.
SG-1
Senior Member
- Location
- Ware Shoals, South Carolina
It contains iron & magnet will stick to it.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Ferromagnetism, in physics, is the property of a material which causes an externally applied magnetic field to cause a (usually substantially) greater magnetic field inside the substance.
It is often, but not always, associated with the ability to form permanent magnets.
The magnetic field in the gap of an iron core relay is much stronger than the field generated by the coil alone.
It is often, but not always, associated with the ability to form permanent magnets.
The magnetic field in the gap of an iron core relay is much stronger than the field generated by the coil alone.
DEW202001
Member
- Location
- ODENTON, MD
Well my bad for not knowing and being a 'inspector'
I was reading the NEC ARTICLE 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment because I am dealing with some heat trace and came across ferromagnetic ground section.
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DEW202001
Member
- Location
- ODENTON, MD
I was reading ARTICLE 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment and did not understand the ferromagnetic envelope it talking about in ground section of 426.
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I doubt it's anything personal-they're just messing with you.
Are you talking specifically about the skin effect article of 426.40 and grounding the ferro magnetic envelope per 426.44?
DEW202001
Member
- Location
- ODENTON, MD
They're just messing with you.
Are you talking specifically about the skin effect article of 426.40 and grounding the ferro magnetic envelope per 426.44?
Yes
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K8MHZ
Senior Member
- Occupation
- Electrician
A ferromagnetic envelope is also called a 'heat tube' and is specific to skin effect heating.
http://www.thermon.com/catalog/us_pdf_files/TEP0096.pdf
http://www.thermon.com/catalog/us_pdf_files/TEP0096.pdf
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