Kode proteksi menurut NEMA atau IEC
Posted on July 2, 2008
Filed Under Motor listrik |
Petunjuk Derajat Pencegahan Frame Motor
(Enclosure Rating Motor/ degree protection)
Ketika kita akan membeli motor listrik, kita harus memberikan spesifikasi jelas terutama:
# Standard apa yang dipilih : NEMA atau IEC atau lainnya
# Selanjutnya yang akan mengikuti standard tsb. mengenai frame/dimension, derajat proteksi, dll
Standard yang terbanyak dipakai di dunia industri motor listrik, al:
- NEMA : National Electric Manufacturers Association
- IEC : International Electrotechnical Commission
Revisi terachir mengenahi Enclosure Ratings telah dipublikasikan oleh NEMA dengan Standard Publication no.250 dan IEC dengan IP Standard 60529
Naskah asli dari NEMA sbb :
NEMA Definitions Pertaining to Non-Hazardous Location :
|
Type |
Description |
|
1 |
Intended for use primarily to provide a degree of protection against limited amounts of falling dirt |
|
3 |
Intended for outdoor use primarily to provide a degree of protection against rain, sleet, windblown dust, and damage from external ice formation. |
|
3R |
Intended for outdoor use primarily to provide a degree of protection against rain, sleet, , and damage from external ice formation |
|
3S |
Intended for outdoor use primarily to provide a degree of protection against rain, sleet, windblown dust, and to provide for operation of external mechanisms when ice laden. |
|
4 |
Intended for outdoor or outdoor use primarily to provide a degree of protection against windblown dust, and rain, splashing water, hose-directed water, damage from external ice formation. |
|
4x |
Intended for outdoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust, and rain, splashing water, hose-directed water, and damage from ice formation |
|
6 |
Intended for outdoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during occasional temporary submersion at a limited depth , and damage from external ice formation |
|
6P |
Intended for outdoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during prolonged submersion at a limited depth , and damage from external ice formation |
|
12 |
Intended for indoor use primarily to provide a degree of protection against circulating dust, falling dirt, and dripping non-corrosive liquids. |
|
12K |
Type 12 with knockouts. |
NEMA Definitions Pertaining to Hazardous Location :
|
Type |
Description |
|
7 |
Intended for indoor use in locations classified as Class I, Group A, B, C, or D, as defined in the National Electrical Code |
|
8 |
Intended for indoor or outdoor use in locations classified as Class I, Group A, B, C, or D, as defined in the National Electrical Code |
|
9 |
Intended for indoor use in locations classified as Class II, Group E, F, or G, as defined in the National Electrical Code |
|
10 |
Constructed to meet the applicable requirements of the Mine Safety and Health Administration |
IEC Definisi
Standard IEC , 60529 menyebutkan Ingress Protection diberi kode 2 digit.
Digit pertama menentukan proteksi sebagai pencegahan bahaya masuknya barang benda padat.
Digit kedua pencegahan bahaya masuknya barang benda air.
Tabel berikut turunan dari standard aslinya.
IP 65 artinya : diproteksi dengan kawat 1.0 mm, artinya tidak bisa dimasuki debu dan dapat mencegah air bertekanan dari segala arah
IEC. Protection Against Ingress of Solid Foreign Objects ( first Digit)
|
Number |
Description |
|
0 |
Non-protected |
|
1 |
Objects equal or greater than 50 mm |
|
2 |
Objects equal or greater than 12.5 mm |
|
3 |
Objects equal or greater than 2.5 mm |
|
4 |
Objects equal or greater than 1 mm |
|
5 |
Dust protected |
|
6 |
Dust tight |
IEC. Protection Against Ingress of Liquid ( first Digit) ( Second Digit)
|
Number |
Description |
|
0 |
Non-protected |
|
1 |
Water dripping vertically |
|
2 |
Water dripping, enclosure tilted up to 15 deg |
|
3 |
Spraying water, up to 60 deg angle from vertical |
|
4 |
Splashing water, any direction |
|
5 |
Jetting water, any direction |
|
6 |
Powerful jetting water, any direction |
|
7 |
Temporary immersion in water |
|
8 |
Continuous immersion in water |
NEMA vs IEC
Informasi ini dibuat oleh NEMA Standard No.250 Appendix A sebagai guide komparasi dari :
“NEMA Enclosure Type Number” ke “IEC Classification Designations“.
IEC tidak menyebutkan derajat proteksi mencegah kerusakan mekanis, risiko meledak, atau kondisi lembab/kondensasi, uap korosive, dll.
NEMA Standards Publikasi 250 meliputi test kondisi environmental , korrosive karat, es, oli, dan pendinginan. Oleh sebab itu maka konversi ini tidaklah persis sama.
Tabel dibawah ini tidak untuk konversi secara persis, jadi harus ada keterangan atau verifikasi test.
|
NEMA Enclosure Type Number |
IEC Enclosure Designation |
|
1 |
IP10 |
|
2 |
IP11 |
|
3 |
IP54 |
|
3R |
IP14 |
|
3S |
IP54 |
|
4 and 4X |
IP56 |
|
5 |
IP52 |
|
6 and 6P |
IP67 |
|
12 and 12K |
IP52 |
|
13 |
IP54 |
Comments
-
Soemarno Adibroto
Lahir di Blora 20 September 1947
Dulu pada th 1972 ketika saya mulai bekerja pada umur muda 24 th di bagian maintenance sebagai supervisor, sulit bagi saya untuk melakukan pekerjaan dengan baik. karena sangat langka bahkan tidak ada buku atau referensi. Sehingga kadang kita tidak tahu berbuat apa yang seharusnya. Maka mulailah mencari sendiri2 pengalaman2 baru berdasar logika dan naluri untuk memperbaiki kebiasaan2 lama. Sejalan dengan waktu maka berkembanglah system atau, Tatacara Maintenance (Maintenance Mangement). Mengingat kesulitan saat itu menjadi pemula bekerja sebagai orang maintenance, maka saya ingin menuliskan apa yang bisa saya tulis terutama untuk para pemula, bagi yang ingin menulis juga sangat di harapkan bergabung, bagi yang ingin diskusi/tanya-jawab yang monggo.
Semoga bermanfaat.
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