If it's what I'm thinking of, they are for flex and not MC. Remember to bring an earth tail wire out to earth the box and the SWA armour though. "I suppose I could have used a metal box in the wall, but I had already installed a plastic one before we made the decision on the gas insert and it just seemed easier to bore a hole in the side and attach the (MC?) Boxes are not approved for a wiring method unless they have integral clamps.Plastic box tab 'clamps' are rated for NM and nothing else.Metal boxes with internal clamps are specific because of the clamps. chemically inert and therefore completely safe. The cable appears to be "similar" to MC but may not be actual MC. So I could have just drilled out the box in question and used MC? Always wear eye protection for the same reason. Screw on lid provides ease of installation. 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Single pair shielded thermocouple extension cables shall be used between thermocouple head and junction boxes / transmitters / local control panel mounted instruments. It is often used in fire-rated occupancies as an alternative to metallic conduit. Squeeze the handles on the cable cutter to secure the armored cable in the cutter. Learn how to use armoured cable glands to connect to consumer units, weather proof enclosures and the similar when using armoured or SWA cable to run to and power garages, out buildings and similar structures. Below you will notice large diameter plastic conduit bringing power to an electrical sub panel. a 20A MCB would be fitted in the consumer unit. It is safer and faster than using a hacksaw. I think that the intent is to have maintain ground connection of the metallic raceway when a plastic box usually insulates between two kos. We work with the industries best to ensure that we recommend only reliable and trustworthy tradesmen. The included wiring is black, white and green, solid 14 ga. in a 3-phase setup then it is also possible to use the steel armour section of the cable as the earth. Modern conduit is made of rigid metal that can be bent into elbows, plastic that includes pre-bent elbows, and flexible metal and plastic ENT materials. Never saw a 14/3 metal clad "appliance cable." DISCLAIMER: All wallpapers and backgrounds found here are believed to be in the "public domain". . The outer steel wire should also be connected to earth via the glands fitted at each end. This tool uses a small cutting wheel powered by a hand crank and will cut only through the armor, leaving the wires undamaged every time. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. even if you are not using the armour as the earth, you need to earth it as it is an extraneous (or is it exposed? Mike makes an excellent point about putting a hole in a box designed for NM cable. There is an issue of whether a plastic box is listed for a metallic connector, but I am only going to address bonding. PVC sleeve slipped over end of armoured cable, PVC sleeve slipped over end of armoured cable, In the exact following order, the sealed nut is slipped on and then the collar retaining nut and then the cable retaining collar ensuring that they are all facing the correct way around. White wires are neutral, meaning they carry power back to the service panel. I just picked up a 25 foot section of 12/2 MC cable with ground (THHN wire). Duh, don't know why I thought I could do that". Will check another. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. It is also slightly more difficult to install, as cutting the metal sheathing takes slightly more time, than cutting NM cable. Hexus: please explain the difference between MC and Flex since they sound the same to me :-). By signing up you are agreeing to receive emails according to our privacy policy. You may be required to use bushings that have an indicator tab, tip or tail. For a better experience, please enable JavaScript in your browser before proceeding. If there was a fault and the jacket became energized the current would have to travel down the jacket until it reached a metallic box. The double connector does penetrate the box. OK, that clarifies things for "boxes" what about non metallic cabinets, non metallic gutters/wireways, or other non metallic enclosures not specifically referred to by NEC as "boxes"? I picked up two of the "screw-in" fittings to connect the MC to the boxes. When it comes to exactly what situations armoured cable should be used in, generally if the cable itself is going to be exposed to the weather and needs to be fully sealed and water proof e.g. "Flex" is flexible spiral conduit (aluminum or steel) that does not have wire in it already and comes in various sizes. Assuming I change out the cable to MC, can I still connect it to the plastic j-box as long as their is a separate ground wire for the receptacle in the firebox, or do your recommend I change that one j-box to a metal box? Splicing onto the existing cable and extending it to a different location is fine, just make sure to splice all the wires together color to color including the ground wire. Be sure to obtain any necessary electrical permits, even if your jurisdiction allows the work to be done by a non-licensed electrician. What is wanted is not the will to believe, but the will to find out, which is the exact opposite. AC couldn't be used because there would be no way to ground the device ruling AC out immediately. We would always recommend earthing at both ends however.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'diydoctor_org_uk-mobile-leaderboard-1','ezslot_18',688,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-mobile-leaderboard-1-0'); One final point to note is that even if you are using one of the inner cores as an earth you must still earth the steel armouring at one end to bond the armouring. The National Electrical Code prohibits use of BX ( technically named Armored Cable/AC ) in wet locations. A suitable strain relief must be provided to . Take a hacksaw blade and cut a ring around where you want it cut. Step 3. Washing machine hook up box above counter top??? The choice of whether armoured cable is surface mounted or buried depends on several factors including the preferences of the homeowner whos having the cable installed, the install location and the budget. x 13 in. An access hole was drilled through the wall of the outbuilding so that the cable could be pulled in and up to the location of the consumer unit.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'diydoctor_org_uk-large-mobile-banner-2','ezslot_14',811,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-large-mobile-banner-2-0');Armoured cable running into outbuilding. This specification covers the requirements for instrument signal cables, thermocouple extension cables, RTD cables and power / control cables. Here's the cable and fitting I purchased. In this case it will be fixed inside a porch area. Now, pull the collar up over the wire strands and then pull up the collar nut and tighten it fully. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. I've been told by a CEU instructor that it is Code compliant to terminate MC cable in plastic JB's. Place the wires in crossed position intersecting about 5 mm from the insulation of the tap wire and the main wire. $5640 ( 586) Model# CC1313 Master Flow 13 in. So that its easier to get on the cable before its stripped, as once prepared the cores or armoured steel sheath can catch the next job is to slide the rest of the glad on to the end of the cable.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'diydoctor_org_uk-narrow-sky-1','ezslot_20',812,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-narrow-sky-1-0'); First, use a utility knife to trim the bottom 10mm or so off of the PVC sleeve and then slip it over the end of the cable and pull it down. The PG series cable glands start from PG7 to PG63 as normal sizes in the worldwide market. Before any work was carried out the entire consumer unit was isolated before the new MCB was added. Neutral Wire's Plastic Insulation Turned Brown. In the example below we are going to run through whats involved in running an armoured supply cable from a property out to an outbuilding via an exterior weatherproof enclosure in a porch. Work gloves are handy when working with armored cable. The opposite end of the wire is then stripped and then connected into the earth bar of the consumer unit or earthing in the item you are using. SWA or steel armoured electrical cable (British standard BS5467)is a type of electrical supply cable that as you may have guessed has its own in-built armoured sheath that protects the electrical charge-carrying conductor cable at the core. IMO IP66 Junction Box 125 x 167 x 82mm 16.99. As far as the plastic or metal box goes, I don't see any functional difference between them for this application. Thanks to all authors for creating a page that has been read 79,772 times. Once the gland sleeve is fixed in place, secure the enclosure to the install location (in this case inside the porch) by screwing through the rear of the enclosure using 8 x 32mm wood screws. If you'd like to support the site, please allow ads. And advice on mixing finishes? As to how armoured cable is actually made up there are essentially 5 different levels that includes the conductor or conductors ate the core, the insulation around each conductor, a layer of bedding around the conductors, the armouring layer around the bedding and then finally a protective PVC outer sheath.Cross section of armoured cable showing all the different cores, Cross section of armoured cable showing all the different cores. 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