Kode proteksi menurut NEMA atau IEC

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

2 Responses to Kode proteksi menurut NEMA atau IEC

  1. budianto says:

    pak,
    saya mo nanya, bagaiman hubungan tegangan, frekuensi, dan rpm dari alternator yang dibebani dengan motor traksi
    terimakasih

  2. Rudi Alfari says:

    Pak bisa informasi saya, untuk mendapatkan buku standarisasi IEC atau NEMA yang komplit kita cari/beli dimana ya? jika ada info mohon dibantu info ke alamat email saya: rudialfari@yahoo.com, terima kasih sekali untuk bantuannya. Regards – Rudi A.
    Jawab: standard tsb itemnya buanyak sekali. seperti SNI, coba searching di internet.

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