We get this every week where people are confused on grounding. The neutral bar in the sub needs to be isolated and u probably need to purchase a separate ground bar kit. 3M Scotchcast Flexible Power Cable Splicing Kits 82. 3M Scotchcast Multi-Mold Resin Splice Kits 85 Series. Now U need both an EGC, tying the main panel to the subpanel AND 2 grounding electrodes. 12.7 mm (2) 15.875 mm (1) 15.9 mm (1) 20 mm (1) 31.8 mm (1) 6 mm (1) Maximum Insulation Outer Diameter (Imperial) 1 in (2) 0.625 in (2) 0.8 in (2) 1.2 in (1). With a bad neutral connection, a shock potential exists! Product Family CSJA Connector Type Mechanical Number of Cores 1 Joints & Splice Voltage Class 28 Joints & Splice Insulation Diameter 17.5 30.48 Joints & Splice Conductor Diameter 7.41 11. This is because the neutral bar was bonded to the metal enclosure as well as any other metal that was bonded to the panel. The reason the allowance was removed is because if the neutral developed a bad connection, the neutral return current could find a different pathway.
#12 3 wire underground splice kit code#
NEC code prior to 2008 allowed a 3-wire feeder to a detached structure ONLY if there was no parallel metallic pathways. That is a common misconception that they are the same or serve the same function. Designed for electrical applications, the Shake N Seal underground wire splice kits are suitable for direct burial applications by providing a permanent watertight seal. There is a bit to do with reduction of step potentials too from ground and now footings that we are standing on.īecause a grounding electrode and an EGC/ground are 2 different animals. The rod is there for lightening strikes, we would rather have it diverted there vs carried via the wire back to the originating building or service if possible. If a guy has a grounded tool from the house and one from the garage come in contact, or a human is the link there is no potential difference between the 2. Some of the same issues as a fault, some probably flows over it but its short lived with a 4th wire, this wire ran WITH the service conductors delivers a fault directly to service main (others can explain more tech, impedance etc) but or also this wire keeps everything metal on this service connected to it at the same potential. Unbonding at the second building allows for the neutrals to be insulated keeping all current on insulated wiring. For example, grounded furnaces in both buildings connected by copper lines, some of the current will flow on this tubing between buildings. With a bonded N some of the operating currents flow on any metal. The problem really came with the advent of so many more metal interconnections between buildings, gas. The earth will not return a fault to trip a breaker, only a wire does this. Its difficult to get past the fact that the ground rod basically does nothing here for the sake of this part of the conversation but there must be a wire pathway with the power conductors back to the main it came from. Underground UF Splice Kit Part HST-1300 This kit will work with 14/8 -2 with a ground, The pic only shows one connector but it comes with three and a holder. This used to be acceptable but was changed in 96 maybe? But anyway the old allowed 3 wire with neutral bonded to the ground at the second panel but this created a lot of problems with alternate pathways for neutral currents.
This is really a service to a detached structure from an existing service.
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