NEMA 4 Enclosure Sizing Chart


This chart will assist you in making a rapid evaluation of the exposed surface area required to cool the average electronics, if the approiximate wattage to be dissipated and the acceptable temperature rise are known.
Select here for Painted Steel Enclosures
Select here for 304 Stainless Steel Enclosures
Select here for 347 Stainless Steel Enclosures
Select here for 410 Stainless Steel Enclosures
This chart is based on an altitude of 3300 feet or less. Consult the equipment manufacturer for higher altitudes.



NEMA 4 Enclosure Sizing Chart For Painted Steel Enclsoure.

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Power in Enclosure(WATTS)Surf. Area (sq.ft.) for 10C rise Surf. Area (sq.ft.) for 15C rise Surf. Area (sq.ft.) for 20C rise Surf. Area (sq.ft.) for 25C rise
25 5 3 2 2
50 10 7 5 4
75 15 10 7 6
100 20 13 10 8
125 25 16 12 10
150 29 20 15 12
175 34 23 17 14
200 39 26 20 16
225 44 29 22 18
250 49 33 25 20
275 54 36 27 22
300 59 39 29 24
325 64 42 32 25
350 69 46 34 27
375 74 49 37 29
400 78 52 39 31
425 83 56 42 33
450 88 59 44 35
475 93 62 47 37
500 98 65 49 39
525 103 69 51 41
550 108 72 54 43
575 113 75 56 45
600 118 78 59 47
625 123 82 61 49
650 127 85 64 51
675 132 88 66 53
700 137 92 69 55
725 142 95 71 57
750 147 98 74 59
775 152 101 76 61
800 157 105 78 63
825 162 108 81 65
850 167 111 83 67
875 172 114 86 69
900 176 118 88 71
925 181 121 91 73
950 186 124 93 75
975 191 127 96 76
1000 196 131 98 78
1025 201 134 100 80
1050 206 137 103 82
1075 211 141 105 84
1100 216 144 108 86
1125 221 147 110 88
1150 225 150 113 90
1175 230 154 115 92
1200 235 157 118 94
1225 240 160 120 96
1250 245 163 123 98
1275 250 167 125 100
1300 255 170 127 102
1325 260 173 130 104
1350 265 176 132 106
1375 270 180 135 108
1400 275 183 137 110
1425 279 186 140 112
1450 284 190 142 114
1475 289 193 145 116
1500 294 196 147 118
1525 299 199 150 120
1550 304 203 152 122
1575 309 206 154 124
1600 314 209 157 125
1625 319 212 159 127
1650 324 216 162 129
1675 328 219 164 131
1700 333 222 167 133
1725 338 225 169 135
1750 343 229 172 137
1775 348 232 174 139
1800 353 235 176 141
1825 358 239 179 143
1850 363 242 181 145
1875 368 245 184 147
1900 373 248 186 149
1925 377 252 189 151
1950 382 255 191 153
1975 387 258 194 155
2000 392 261 196 157
2025 397 265 199 159
2050 402 268 201 161
2075 407 271 203 163
2100 412 275 206 165
2125 417 278 208 167
2150 422 281 211 169
2175 426 284 213 171
2200 431 288 216 173
2225 436 291 218 175
2250 441 294 221 176
2275 446 297 223 178
2300 451 301 225 180
2325 456 304 228 182
2350 461 307 230 184
2375 466 310 233 186
2400 471 314 235 188
2425 475 317 238 190
2450 480 320 240 192
2475 485 324 243 194
2500 490 327 245 196
2525 495 330 248 198
2550 500 333 250 200
2575 505 337 252 202
2600 510 340 255 204
2625 515 343 257 206
2650 520 346 260 208
2675 525 350 262 210
2700 529 353 265 212
2725 534 356 267 214
2750 539 359 270 216
2775 544 363 272 218
2800 549 366 275 220
2825 554 369 277 222
2850 559 373 279 224
2875 564 376 282 225
2900 569 379 284 227
2925 574 382 287 229
2950 578 386 289 231
2975 583 389 292 233
3000 588 392 294 235
3025 593 395 297 237
3050 598 399 299 239
3075 603 402 301 241
3100 608 405 304 243
3125 613 408 306 245
3150 618 412 309 247
3175 623 415 311 249
3200 627 418 314 251
3225 632 422 316 253
3250 637 425 319 255
3275 642 428 321 257
3300 647 431 324 259
3325 652 435 326 261
3350 657 438 328 263
3375 662 441 331 265
3400 667 444 333 267
3425 672 448 336 269
3450 676 451 338 271
3475 681 454 341 273
3500 686 458 343 275
3525 691 461 346 276
3550 696 464 348 278
3575 701 467 350 280
3600 706 471 353 282
3625 711 474 355 284
3650 716 477 358 286
3675 721 480 360 288
3700 725 484 363 290
3725 730 487 365 292
3750 735 490 368 294
3775 740 493 370 296
3800 745 497 373 298
3825 750 500 375 300
3850 755 503 377 302
3875 760 507 380 304
3900 765 510 382 306
3925 770 513 385 308
3950 775 516 387 310
3975 779 520 390 312
4000 784 523 392 314
4025 789 526 395 316
4050 794 529 397 318
4075 799 533 400 320
4100 804 536 402 322
4125 809 539 404 324
4150 814 542 407 325
4175 819 546 409 327
4200 824 549 412 329
4225 828 552 414 331
4250 833 556 417 333
4275 838 559 419 335
4300 843 562 422 337
4325 848 565 424 339
4350 853 569 426 341
4375 858 572 429 343
4400 863 575 431 345
4425 868 578 434 347
4450 873 582 436 349
4475 877 585 439 351
4500 882 588 441 353
4525 887 592 444 355
4550 892 595 446 357
4575 897 598 449 359
4600 902 601 451 361
4625 907 605 453 363
4650 912 608 456 365
4675 917 611 458 367
4700 922 614 461 369
4725 926 618 463 371
4750 931 621 466 373
4775 936 624 468 375
4800 941 627 471 376
4825 946 631 473 378
4850 951 634 475 380
4875 956 637 478 382
4900 961 641 480 384
4925 966 644 483 386
4950 971 647 485 388
4975 975 650 488 390
5000 980 654 490 392


NEMA 4 Enclosure Sizing Chart For 304 Stainless Steel Enclsoure.

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Power in Enclosure(WATTS)Surf. Area (sq.ft.) for 10C rise Surf. Area (sq.ft.) for 15C rise Surf. Area (sq.ft.) for 20C rise Surf. Area (sq.ft.) for 25C rise


NEMA 4 Enclosure Sizing Chart For 347 Stainless Steel Enclsoure.

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Power in Enclosure(WATTS)Surf. Area (sq.ft.) for 10C rise Surf. Area (sq.ft.) for 15C rise Surf. Area (sq.ft.) for 20C rise Surf. Area (sq.ft.) for 25C rise




Notes:
#1. When the above data disagrees with actual manufacturer data, always default to actual manufacturer data.
#2. These values are for educational purposes only.
Due to the wide range of circuit applications, the author assumes no responsibility for the application of these values.


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NEMA 4 Enclosure Sizing Chart For 410 Stainless Steel Enclsoure.

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Power in Enclosure(WATTS)Surf. Area (sq.ft.) for 10C rise Surf. Area (sq.ft.) for 15C rise Surf. Area (sq.ft.) for 20C rise Surf. Area (sq.ft.) for 25C rise
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