Are barrier terminal blocks or bus bars inside a junction or weather-proof box up to NEC code?


I'm going to be adding some Particle Photon relay control to some receptacles so I can remotely turn on and off appliances and lighting. I'm going to house the Photon board and relay in a weather-proof PVC box (the gray stuff at home depot). To that, I will connect another box via two weather-proof PVC pipes. Through one pipe, I will run the hot, neutral, and ground wires to bus bars or terminal blocks. Through the other pipe, I'll then run three leads from the hot bar back to the COM connections on the relays, then three leads from the NO connections on the relays to the three receptacles. I'll have the three pairs of hot leads shrink wrapped.

Electrically, it looks sound. But is doing this up to code? This particular contraption will be in a garage, out of the weather.

Schematic of proposed plan:

Bus bars (found in electrical service panels) and Terminal/Barrier blocks:...

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Electrical junction box in the process of installation.

Electrical conduits

terminate at the sides and


pass through or are joined inside the box.

Australian Internal Surface Mounted Junction Box - showing wiring stages.

An electrical junction box is an enclosure housing electrical connections, to protect the connections and provide a safety barrier.


A small metal or plastic junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, under floors or concealed behind an access panel - particularly in domestic or commercial buildings. An appropriate type (such as that shown on the right) may be buried in the plaster of a wall (although full concealment is no longer allowed by modern codes and standards) or cast into concrete - with only the cover visible.

It sometimes includes built-in...

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There are five code issues that surface with your installation plan. To begin with though, there is NO code violation involved with having a receptacle in your attic space. Chapter 2 of the National Electrical Code (NEC) does not specifically exclude outlets installed in attics or "non-living" space. However, the five code issues to stay mindful of are, 1) Tenant control issues and where the service is supplied from. 2) Arc-Fault protection requirements. 3) your receptacles and all junction boxes etc... must remain accessible. 4) Extension cords and the like are not allowed as a substitute for permanent wiring in a dwelling. 5) Finally, rules for receptacles located in a damp location.

The most important and critical of all the items listed above, are the first two. Article 210.25(A) & (B) specifies branch circuits shall supply ONLY loads within or associated with the unit that it is supplied from. (B) allows for common circuits between dwelling units in a multi-family dwelling,...

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A terminal block is a screw-type electrical connector where the wires are clamped down to the metal part by a screw. It is a connector which allows more than one circuit to connect to another circuit. It often contains two long aluminum or copper strips that are designed to connect different components. These strips create a bus bar for power distribution that is sent to the connected components. A barrier strip is composed of several screw terminals.

Types of Terminal Blocks & Barrier Strips

There are several different kinds of terminal blocks & barrier strips at Future Electronics. We stock many of the most common types categorized by manufacturer, category and packaging type. Our parametric filters will allow you to refine your search results according to the required specifications.

Terminal Blocks & Barrier Strips from Future Electronics

Future Electronics has a wide range of terminal blocks & barrier strips from several manufacturers that can be...

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