Mustang6771
Member
- Location
- New Orleans, La
I'm in the middle of a design of a few sections of a super market, namely the deli right now. There are multiple refrigerated cases all over this and other departments, so if I figure it out once I'm good to go.
Lets take one deli refrigerated display case. The unit isn't self contained, the refrigerant is piped in from a central system. This unit is accessible by employees from the rear and has glass on all sides to allow the customer to see the meats and cheeses they want. There is a lighting circuit needed (draws 7A), a refrigerant motor circuit needed (draws 3A) and a circuit for Danfoss control. [This information is from a crappy spreadsheet from the manufacturer]. All of this is 120V. Most of these units have a switch built into the unit to cycle power - I will have to verify for each unit as the "cut sheets" I have are little more than sketches showing entry points.
The owner wants and has similar units hardwired at other stores and locations, but I am unsure if that is code permissible and my reasoning is as follows: Section 440 NEC 2008 deals with refrigeration equipment. Under location of disconnecting means it needs to be within sight. The panel is located some distance away and is not within sight. So I suggested using lockable cord and plugs, but this would require 3 sets for one unit if I have to disconnect all three circuits (lights, motors, Danfoss). Owner doesn't like that. We can possibly locate motor rated switches under the units if needed but he still isn't excited about this as he doesn't have it that way at other stores. In this situation, what kind of disconnecting means is necessary or acceptable? If you have installed or designed cases similar to this before, how did you wire and provide disconnecting means and what was your code basis?
I know there are probably some details missing from this account so please reply with any and all questions.
As a note, some of the refrigerated cases have motors that draw less than 300VA, so would the provisions of NEC 2008 422.31(A) apply to these, even if there are extra circuits for lighting and built in receptacles?
Lets take one deli refrigerated display case. The unit isn't self contained, the refrigerant is piped in from a central system. This unit is accessible by employees from the rear and has glass on all sides to allow the customer to see the meats and cheeses they want. There is a lighting circuit needed (draws 7A), a refrigerant motor circuit needed (draws 3A) and a circuit for Danfoss control. [This information is from a crappy spreadsheet from the manufacturer]. All of this is 120V. Most of these units have a switch built into the unit to cycle power - I will have to verify for each unit as the "cut sheets" I have are little more than sketches showing entry points.
The owner wants and has similar units hardwired at other stores and locations, but I am unsure if that is code permissible and my reasoning is as follows: Section 440 NEC 2008 deals with refrigeration equipment. Under location of disconnecting means it needs to be within sight. The panel is located some distance away and is not within sight. So I suggested using lockable cord and plugs, but this would require 3 sets for one unit if I have to disconnect all three circuits (lights, motors, Danfoss). Owner doesn't like that. We can possibly locate motor rated switches under the units if needed but he still isn't excited about this as he doesn't have it that way at other stores. In this situation, what kind of disconnecting means is necessary or acceptable? If you have installed or designed cases similar to this before, how did you wire and provide disconnecting means and what was your code basis?
I know there are probably some details missing from this account so please reply with any and all questions.
As a note, some of the refrigerated cases have motors that draw less than 300VA, so would the provisions of NEC 2008 422.31(A) apply to these, even if there are extra circuits for lighting and built in receptacles?
