Natfuelbilll
Senior Member
Can a NEMA 3R floor mount freestanding circuit breaker enclosure have an open bottom?
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Can a NEMA 3R floor mount freestanding have an open bottom?
- Thread starter Natfuelbilll
- Start date
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- Not open for further replies.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Can a NEMA 3R floor mount freestanding circuit breaker enclosure have an open bottom?
Yes.
I have seen many outdoor switchboard installations with open bottoms.
Natfuelbilll
Senior Member
Is it acceptable then to have water infiltrate the enclosure between the concrete pad and the enclosure?
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Is it acceptable then to have water infiltrate the enclosure between the concrete pad and the enclosure?
Yes,
They are not 'tight' they are simply 'resistant'. Water ingress is allowed, as long it it is below live parts.
NEMA3 or 3r.
NEMA3 Weather-resistant. Protects against falling dirt and windblown dust, against weather hazards such as rain, sleet and snow, and is undamaged by the formation of ice. Used outdoors on ship docks, in construction work, and in tunnels and subways.
3R As 3, but omits protection against windblown dust.
NEMA3 Weather-resistant. Protects against falling dirt and windblown dust, against weather hazards such as rain, sleet and snow, and is undamaged by the formation of ice. Used outdoors on ship docks, in construction work, and in tunnels and subways.
3R As 3, but omits protection against windblown dust.
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- Not open for further replies.