BenP
New User
- Location
- Washington DC
With regard to exterior electrical installations I would like to get some feedback on the service life of NEMA 3 verses 4. A little background, I have produced several designs over the past several years and when it comes to the NEMA rating I err on the conservative side buy specifying 4 in all exterior applications. Many have argued that NEMA 3 is acceptable, however I specify 4 to last. Unfortunately, once the design is complete I move on and rarely get a chance to observe the field and how things held up. I have also had several discussions with contractors and others over the years on the topic. I understand all conditions are not created equal such as a disconnect being installed beneath an overhang verses in direct contact with weather.
For those of you that spend a good deal of time in the field modifying/replacing systems etc. is 4 worth the added cost? Furthermore, has anyone experienced a failure of a NEMA 3 due to its construction?
For those of you that spend a good deal of time in the field modifying/replacing systems etc. is 4 worth the added cost? Furthermore, has anyone experienced a failure of a NEMA 3 due to its construction?