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Roof-top receptacles

Sifu

Sifu

SAWHORSE
Joined
Sep 3, 2011
Messages
3,471
Little outside my wheelhouse. I have a plan with RTU-s and MUA's on the roof. No rooftop receptacle is indicated on the plans but the mechanical schedule notes indicate the RTU's have a "non-powered weather proof GFCI receptacle". Can't recall seeing the "non powered" part before. Other than the obvious explanation that they are not powered, is there some provision that would allow this if this is what it means?
 
TheCommish said:
Here in Massachusetts a work 120vac outlet has to be provided within 25 feet of roof top mechanical equipment
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See 2023 NEC 210.63, which provides that "the receptacle outlet shall not be connected to the load side of the equipment's branch-circuit disconnecting means." The non-powered part of the description probably means (though it could be clearer) that it's not wired to the equipment and needs a separate circuit. If there's several pieces of equipment within 25' of each other they may not all need to be energized.
 
LR419 said:
See 2023 NEC 210.63, which provides that "the receptacle outlet shall not be connected to the load side of the equipment's branch-circuit disconnecting means." The non-powered part of the description probably means (though it could be clearer) that it's not wired to the equipment and needs a separate circuit. If there's several pieces of equipment within 25' of each other they may not all need to be energized.
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This is correct, it can not be supplied from the equipment
 
Oh you're kidding me. I googled "cordless vacuum pumps" and first hit was a list of "the top 10 cordless vacuum pumps for HVAC". Cordless hoists and lights are also plentiful. It's only dinosaurs like me that sticks with corded tools. My son, a contractor, laughs at me. I don't think he has a single corded tool other than his battery charger that charges like a dozen batteries ar a time.
 
LR419 said:
See 2023 NEC 210.63, which provides that "the receptacle outlet shall not be connected to the load side of the equipment's branch-circuit disconnecting means." The non-powered part of the description probably means (though it could be clearer) that it's not wired to the equipment and needs a separate circuit. If there's several pieces of equipment within 25' of each other they may not all need to be energized.
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This makes sense. Each RTU has one attached to the unit so I imagine they are stipulating the power must remain available when the unit is disconnected. I guess I've have just never noticed it stated this way. I'll just make a note to reference 210.63.
 
Sifu said:
Little outside my wheelhouse. I have a plan with RTU-s and MUA's on the roof. No rooftop receptacle is indicated on the plans but the mechanical schedule notes indicate the RTU's have a "non-powered weather proof GFCI receptacle". Can't recall seeing the "non powered" part before. Other than the obvious explanation that they are not powered, is there some provision that would allow this if this is what it means?
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We would run two circuits to that RTU. One 480V for the RTU and a 120V circuit for the GFCI receptacle, factory-mounted inside the RTU.
 
jar546 said:
We would run two circuits to that RTU. One 480V for the RTU and a 120V circuit for the GFCI receptacle, factory-mounted inside the RTU.
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That is what I have seen, just never noticed the "non-powered" language on the mechanical schedule before.
 
Well I be dammed 90 minute battery on the Milwaukee pump, seen guys pump for 3 hours to get a system down to needed vacuum.

everything is available in batty format now possibly I guess, practical maybe?
 
jar546 said:
factory-mounted inside the RTU
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210.8 Ground-Fault Circuit-Interrupter Protection for Personnel. Ground-fault circuit-interrupter protection for personnel shall be provided as required in 210.8(A) through (F). The ground-fault circuit interrupter shall be installed in a readily accessible location.

Accessible, Readily (Readily Accessible). Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to take actions such as to use tools (other than keys), to climb over or under, to remove obstacles, or to resort to portable ladders, and so forth. (CMP-1)
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I can add that the requirement for a 120v receptacle on a roof does not apply to most SFR.
 
ICE said:
210.8 Ground-Fault Circuit-Interrupter Protection for Personnel. Ground-fault circuit-interrupter protection for personnel shall be provided as required in 210.8(A) through (F). The ground-fault circuit interrupter shall be installed in a readily accessible location.

Accessible, Readily (Readily Accessible). Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to take actions such as to use tools (other than keys), to climb over or under, to remove obstacles, or to resort to portable ladders, and so forth. (CMP-1)
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I can add that the requirement for a 120v receptacle on a roof does not apply to most SFR.
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Factory mounted inside the RTU with the bubble cover on the outside.
 
bill1952 said:
In the shop. Not carrying that charger to a roof.
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I spent 3 full days in a row during the summer working on a large flat roof in Fort Lauderdale, prepping it for the removal and replacement of all electrical conduit, disconnects, switches, and receptacles. The chargers for the batteries were on the roof with us, along with a bottomless cooler of water bottles on ice. The PVC conduit heater was another corded tool that was necessary.
 
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