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Resource: safe electric wiring
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How to wire RV connection Resource: safe electric wiring |
 30-50 amp flush outlet Buy: Legrand At Amazon Outlet cover |
 30-amp flush outlet Buy: Legrand At Amazon Outlet cover |
 30 amp Power grip plug Buy: Power grip at Amazon Power grip at Amazon All Camco power plugs Camco 50 amp 30' Camco 50 amp 15' All RV extension cords 50 amp pigtail to 30 amp 30 amp pigtail to 50 amp |
 50 amp Power grip RV extension cord Buy: Camco 50 amp at Amazon RV extension cords |
| Use only 600 volt wire. Lamp cord, extension cords are not rated 600 volt. Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional. 30 amp breaker use 10 gauge / 120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.  Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps. Buy: 10-2 gauge/ 30 amp 10-3/ 30 amp Southwire electric tools |
Yellow
12 gauge 20 amp 120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire. ... cannot be connected to 30-40 amp breaker. 1  Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps. Buy: 12-2 gauge/ 20 amp 12-3/ 20 amp NMB is house wiring UF is underground Rolls of stranded wire HOOK UP Wires |
White
14 gauge 15 amp 120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker. Never connect 15 gauge wire to 20-30-40 amp breaker.  White/ #14 gauge wire, with ground ... 15 amp capacity. Safe maximum 12 amps. Buy: 14-2 gauge/ 15 amp 14-3/ 15 amp NMB is house wiring UF is underground |
| 50-60
amp breaker use 6 gauge / 240 volt 50 outlet can be installed on 50 amp breaker only  Buy: 6-2 wire Southwire electric tools NMB is house wiring UF is underground |
40-50
amp breaker use 8 gauge / 240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only  Buy: 8-2 wire Southwire electric tools NMB is house wiring UF is underground |
  Copper ground wire. Every device, load, metal enclosure etc must be grounded. Ground wire must be continuous throughout installation, never switched on-off, never used as a Neutral wire. Generally ... use same size as other wire in circuit Buy: 12 gauge copper ground wire Ground wire Green ground wire Ground pigtails Ground rods/ ground clamps at Amazon |
 Non metallic flexible cables must carry ground wire, but do not have hazard of short circuit causing injury from shock. Armored steel cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure. All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes. Movement, damage and deterioration are major cause of electrical failure. Buy: Non-metallic flexible conduit Power whip Armored cable Southwire armored cable cutter Pull boxes |
 Electrical tools must be insulated. Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off. Buy: Electrician tools kits KLEIN TOOLS Tools kits IRWIN tools KNIPEX Telephone cable knife Low Voltage Mounting Bracket for Telephone |
Push-on wire connectors in place of twist-on connectorsBuy:Push on wire connectors Amazon Red 3P connector for 10-14 gauge wire Lever connectors for stranded wire at Amazon HOOK UP Wires |
 Protect wiring from damage Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable. -Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15 Buy End cutting nippers at Amazon |
  Electrically insulated tools When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistance and heat on wire and creates possible weak point. Buy tools: KLEIN TOOLS Wire strippers at Amazon Electric Wire Stripping Machine Linesman pliers Utility knife at Amazon |
 Multimeters Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire. Buy: Analog multimeter Multimeters at Amazon Klein multimeter Electric testers at Amazon Clampmeter for testing amp flow on line |
 GFCI circuit breaker A GFCI circuit breaker will protect all boxes on circuit. Circuit must be grounded. Ground wire must be continuous and connected to each piece of equipment. White wire on circuit breaker must be connected to Neutral busbar inside the breaker panel. Buy GFCI circuit breakers |
Push down 1" wide Push down breaker Plug-in breaker Buy single-pole: Choose from 15 to 60 amp Eaton CL series Siemens 15-60 amp Single-pole tandem breaker Tandem breakers |
Push down 2" wide Push down breaker Plug-in breakers Buy double-pole: Choose from 15 to 125 amp Choose from 15 amp to 200 amp Eaton CL series circuit breaker Siemens circuit breaker Double pole GFCI |
 A. 14-50R 240 vac / 50 amp B. TR-30R 120 vac / 30 amp C. 6-20R 120 vac / 20 amp |
ALL NEMA TT-30R (Travel
Trailer) are 120 vac Do not confuse NEMA 10-30R or 14-30R; people have tried to "adapt" their RV 30 amp power cord to plug in a dryer receptacle. Mucho damage. Perhaps a special section for RV power considerations. NEMA 14-50R Trailers / Motor Homes are 240 vac / 50 amp NEMA 6-20 "T-Slot" is 120 vac / 20 amp TT-30R is NEVER configured as 240 vac Nearly ALL RV Sites have a peristalsis with all 3 services Nearly ALL RV Sites have a pedestal providing all 3 RV power sources - 240 vac / 50 amp and 120 vac / 20 & 30 amp. Resource: Trailer 120 volt connection 50 amp connection Read about 240 volt outlets |
50 amp/ 3-prong/ RV For RV, the 50 amp is 240 volt and 30 amp outlet is 120 volt, not 240 volt, and wires are typically Black-white Hot-Neutral... with silver screw for Neutral ... see illustration below |
50 amp/ 3-prong/ RV |
| Hey Gene, The first diagram I mentioned was of course the one labeled "30 amp/3-prong/RV outlet". It's the last receptacle wiring diagram before the section on "Locking plugs/ twist lock". As I mentioned before, RV 30 amp service is strictly 110V,* and the receptacle is wired hot-neutral-ground. The second diagram is three diagrams above that and is labeled "30 amp/3-prong/dryer". You show that as a hot-hot-ground configuration. Technically the NEMA 10-30 is a no-ground circuit.* Immediately to the left of that receptacle diagram, you show a picture of the 10-30R with the following caption: 30 Amp Profile NEMA 14-30 NEMA 10-30R Actually the 14-30(R) is the 4 wire receptacle shown in the diagram immediately below this (labeled "30 amp/4-prong/dryer"). The wiring diagram for that receptacle is shown correctly (with both neutral and ground), but the caption underneath the picture of the outlet on the immediate left says "Neutral is NOT required for 240 volt circuit". This is not correct as the neutral is used between the the hot legs when the loads aren't balanced. The only real difference between this service and the one shown directly below it ("50 amp/4-prong/RV") is the current carrying capacity. * Some background source material: NEMA 10 devices are a deprecated type that had been popular in the United States for use with electric clothes dryers and kitchen ranges. They are classified as 125/250 V non-grounding (hot-hot-neutral), yet they are usually used in a manner that effectively grounds the appliance, though not in a manner consistent with most modern practice. This was before the requirement of a separate safety ground was a incorporated in the National Electrical Code. As commonly used, 10-30 and 10-50 plugs have the frame of the appliance grounded through the neutral blade. This was a legal grounding method under the National Electrical Code for electric ranges and clothes dryers from the 1947 to the 1996 edition. Since North American dryers and ranges have certain parts (timers, lights, fans, etc.) that run on 120 V, this means that the wire used for grounding is also carrying current. Although this is contrary to modern grounding practice, such installations remain common in older homes the United States. NEMA 14 devices are four-wire grounding devices (hot-hot-neutral-ground) available in ratings from 15 to 60 A. Of the straight-blade NEMA 14 devices, only the 14-30 and 14-50 are common. The 14-30 is used for electric clothes dryers and the 14-50 for electric cooking ranges. Both are used for home charging of electric vehicles. The voltage rating is 250 V. They are essentially the replacements for the NEMA 10 connectors above with the addition of a separate grounding connection. All NEMA 14 devices offer two hots, a neutral and a ground, allowing for both 120 and 240 V (or 120 and 208 V if the supply system is three-phase rather than split-phase). The 14-30 has a rating of 30 A and an L-shaped neutral blade. The 14-50 has a rating of 50 A and a straight neutral blade sized so that it does not fit in the slot of a 14-30. NEMA 14-50 devices are frequently found in RV parks, since they are used for shore power connections of larger recreational vehicles. Also, it was formerly common to connect mobile homes to utility power via a 14-50 device. NEMA 14-30 and 14-50 receptacles NEMA TT-30 plug and receptacle. (The center hole on the receptacle is not a contact.) NEMA TT-30 (TT stands for Travel Trailer) is a 125 V, 30 A recreational vehicle standard (hot-neutral-ground), also known as RV 30. It is frequently (and sometimes disastrously) confused with a NEMA 10-30. The RV receptacle is common in nearly all RV parks in the United States and Canada, and all but the largest RVs manufactured since the 1970s use this plug. The hot and neutral blades are angled at 45° from vertical and 90° to each other, similar to NEMA 10 devices. The plug is slightly smaller than a NEMA 10 but larger than ordinary 5-15 plugs. The ground pin, however, is round, like those on straight-blade NEMA grounding devices. Referring to the diagram, the orientation is the same as the NEMA 5 plug and socket, with the receptacle neutral on the lower right. The appearance of this plug makes many people assume it is for 240 V, but this is a 120 V device. Hope this helps :-) |
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| Hey Gene, A light bulb went off in my head at 2:00 this morning, and I realized what (I think) you meant by the language that "Neutral is not required for 240 Volt circuit" next to the picture of the NEMA 14-30 receptacle. I was of course approaching this from the standpoint that the 240v circuit is made up of two 120v legs. If you have no 120v loads and are using nothing but a 240v load, then the neutral conductor will indeed carry no current. So, it's "not required" in the sense that with a pure 240v load the circuit will work without a neutral. In most circumstances though I'm pretty sure it would still be a code violation to wire a 14-30R without the neutral conductor. If you want to run a 3 wire circuit, then you would use the 10-30R shown directly above the 14-30. |
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| LOL about the 2am light
bulb idea !! Sounds like me... jumping out of bed and writing down something so I don't forget Here's an illustration that might clarify 120-240 volt wiring a bit.. http://waterheatertimer.org/images/Inside-Main-Breaker-Box-12.jpg I haven't had time to digest your emails ... however the 120 volt Neutral does not carry voltage The function of the neutral is to complete the circuit back to generator ... it 'balances the equation' so to speak, stabilizes the grid against surge events, assists circuit breakers, and connect all ground wires into one giant array across the grid. No small task. http://waterheatertimer.org/240-volt-generator.html |
|
| Just a word of caution
about your page showing how to
wire 240 volt outlets. You have a diagram showing a "30
amp/3-prong/RV outlet" wired as a 240 volt circuit. Thirty
amp RV service is strictly 120 volts only. Because of the
shape of the outlet & plug, the TT-30R & TT-30P are
often confused with the old NEMA 10-30, but if you wire a TT-30R for
240 volts and plug an RV into it, you will smoke everything in the RV
in seconds. And I'm not trying to nit-pick, but on the diagram you show for the NEMA 10-30, you have the neutral labeled as "ground". Just thought I'd pass that along..... Thanks for your page. |
|
I feel your Website is in error. Under your 30 amp / 3-prong / RV http://waterheatertimer.org/How-to-wire-240-volt-outlets.html The 30 amp 3-prong RV service is 110 vac and not 240 vac It is a TT-30R receptacle which is 110 vac only. Your configuration will fry a Travel Trailer. A lot of RV’ers try to hook up to a house dryer receptacle and fry RV their electrical system. I have bookmarked and fine your site very informative. Regards, David Little |
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Multimeter Test for breaks in wire/ Test for voltage Most appliance require 80% rated voltage to function correctly Buy Analog multimeter Multimeters at Amazon Klein multimeter Electric testers at Amazon Clampmeter for testing amp flow on line Resource: How to test and replace element How to test thermocouple Element tests for 120 volts How to test wire |
Safety
when testing wires:
Never touch wet or previously flooded appliance. Never stand on wet surface when working on electric. Never stand on bare soil, put down dry boards. Tape tester leads to wood sticks to keep hands away from power. Use non-contact voltage tester before touching wires. Never touch or lean into any made of metal. Remove metal objects from pockets. Do not use oxygen or fuel accelerants in same room as electrical repairs Resource: Basic house wiring |
 Non-contact voltage tester Test for power without touching connectors NEVER assume power is OFF Buy: Non-contact voltage tester Amazon Electric testers at Amazon Resource: How to test electric power is off |
 120 volt 15 amp devices
including GFCI, timers, switches, plugs, wifi controls etc can be
installed on 15 or 20
amp
breaker.120 volt GFCI, outlet, receptacle that is rated 20 amp can be installed on 20 amp breaker only, but NOT on 15 amp breaker. Buy 15 amp GFCI 20 amp GFCI |
Buy Basic electric book Home plumbing/ electrical codes  Or learn about basic household electricity... use and search my site/ Resource Safe electric wiring Basic house wiring |
 Use outlet tester to check for correct wiring on any 120 volt straight-blade outlet. Buy: Klein testers Outlet tester Circuit breaker finder Electric usage monitor |
Twist-on wire connector assortmentsDo not reuse old connectorsTwist wire connector very tight. Pull wires to ensure they will not come loose. Cover all bare copper. Buy: Connector assortment at Amazon Connector assortment at Amazon Resource How to select and install twist-on wire connectors |
Weatherproof wire connectorConnector cavity is full of siliconeBuilt-in cover keeps silicone in place Protect from water, dust etc Buy from my affiliate links Weatherproof size 14 to 6 Amazon Weatherproof size 22 to 8 Amazon Resource How to select and install connectors |
Connect wire to screw terminal Use only 600 volt solid copper wire. Do not use stranded wire or extension cord. Do not use solder anywhere on residential 120-240 volt wiring. Attach electric installation to structure. Tighten screws very tight against wire.  Buy: NEC books Dewalt plumbing/ electrical codes Basic electric book National electric code guide/ illustrated Resources: How to twist wire How to select and install twist-on wire connectors |
 Weatherproof
lever switch on outdoor lightsSafely operate outdoor toggle switch Replaces outdoor cover Install over top of ordinary switch Works with single-pole, double-pole, 3PST, 3-way, 4-way switches etc Use weatherproof box for outdoor Can be used indoor or outdoor Buy: Best choice: Cantex lever switch Outdoor lever switches at Amazon Lever switches Resource Cantex-toggle-switch-covers.pdf Cantex-PVC-junction-boxes.pdf |
Buy: |
Push-on wire connectors in place of twist-on connectorsBuy:Push on wire connectors Amazon Red 3P connector for 10-14 gauge wire Lever connectors for stranded wire at Amazon |
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable. Code -Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15 Buy End cutting nippers at Amazon |
 When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point. Buy tools: Wire strippers at Amazon Linesman pliers Pro linesman plier Needle nose pliers End cutting nippers at Amazon |
 Weather resistant plastic box for outdoor extension cord connections, Christmas lights, outdoor power strip etc . Not for connecting wires with wire nutsŪ, or in-wall wiring, but can be used indoors to organize extension cords, power strips etc. Weather resistant is not weatherproof or watertight. Use enclosures rated IP65 and IP67 for waterproof. Extension cords cannot be used for permanent wiring. Buy: Large-medium-small electric cord box Socketbox Raintight enclosures Water-tight cord lock Resource: Enclosures and boxes |
 Contactors/ relays |
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