alan0043 Posted December 29, 2016 Report Share Posted December 29, 2016 Hi Everyone, I am in the planning stage of adding a extra 12v fuse box. The fuse box has room for 12 circuits. The fuse box is a Blue Sea brand with grounds going to the fuse box. I am planning to locate this fuse box in the driver side storage compartment. What size wire do I need ? I am thinking # 8 would work. Is there a flexible #8 wire ? Something like welding cable. What size fuse and what type should I use to supply the positive side of the fuse box ? Thank you for any help, Al 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
I'mdonewiththis forum Posted December 29, 2016 Report Share Posted December 29, 2016 What is the total amp draw going to be on this block? That and the distance from the power supply is what you need to determine the wire size and main fuse size. Link to comment Share on other sites More sharing options...
alan0043 Posted December 29, 2016 Author Report Share Posted December 29, 2016 What is the total amp draw going to be on this block? That and the distance from the power supply is what you need to determine the wire size and main fuse size. I don't know what the total amp draw is going to be. I want to have this extra fuse box just incase that I need extra circuits for added on equipment to the truck. That is the best answer that I can give. Right now I don't see any high draw equipment being added. Al 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted December 29, 2016 Report Share Posted December 29, 2016 Alan, The fuse panel has a maximum amp rating on it somewhere. That amp rating and the distance to battery x2 is what you need to work with for cable size. Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
alan0043 Posted December 29, 2016 Author Report Share Posted December 29, 2016 Alan, The fuse panel has a maximum amp rating on it somewhere. That amp rating and the distance to battery x2 is what you need to work with for cable size. Thanks Jim. I will look for the rating. This is going to be a big help. Al 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
billr Posted December 29, 2016 Report Share Posted December 29, 2016 Alan I ran 2/0 welding cable from batt bank into compartment to blue sea power posts. Have a 200amp fuse at batts. That allows the inverter a place to connect very close short run. Then from the posts fed the Blue Sea fuse panel for extra circuits. Mine only had spaces for 8 circuits. Used #4 wire. Short run. All my users are low amps. Bill and Joan and 3 Collie pups 2001 Volvo VNL 770 "The Doghouse" Singled short, "ET" hItch VED12 465HP Gen 1 Autoshift 3.58 ratio 2005 Mobile Suite 38RL3 2011 Smart Passion loaded piggybacK Weigh-It Portable RV Scales http://www.weighitrv.com/ Link to comment Share on other sites More sharing options...
RandyA Posted December 30, 2016 Report Share Posted December 30, 2016 If you have the "standard" Blue Sea fuse panel the rating should be 40 amps. 8 AWG copper tinned marine grade wire is the best choice for a 40 amp feed. Be careful what you buy, a lot of the wire out there is copper coated aluminum and may not really be 8 AWG (Pyramid is an example). Marine grade is tinned and more resistant to oxidation/corrosion. You will have a short run from the battery's to the fuse panel so you most likely only need about 5' of hot and ground. I would not use a fuse in the 8 AWG from the battery - an automatic resetting marine circuit breaker is my choice. Don't forget your feed through bushings where you come through the floor. Bushings for RG-6 coax are cheap and sized right for #8 AWG wire. The links I provided are strictly for "examples", not an endorsement of a specific product. Randy, Nancy and Oscar "The Great White" - 2004 Volvo VNL670, D12, 10-speed, converted to single axle pulling a Keystone Cambridge 5th wheel, 40', 4 slides and about 19,000# with empty tanks. ARS - WB4BZX, Electrical Engineer, Master Electrician, D.Ed., Professor Emeritus - Happily Retired! Link to comment Share on other sites More sharing options...
Hot Rod Posted December 30, 2016 Report Share Posted December 30, 2016 I can definitely recommend welding cable over automotive battery cable. Used it on many projects over the years. You will find it to be better quality, much less expensive, and far more flexible than battery cable. It is way cheaper, so just oversize it a gauge or two to be on the safe side for peace of mind if you want. They will also have reasonably priced brass terminals at the same welding supply, and generally will crimp them on for you with a smile and no extra charge. If not, pick up a cheap hammer crimper tool and install them yourself. Link to comment Share on other sites More sharing options...
Jim & Wilma Posted December 30, 2016 Report Share Posted December 30, 2016 No argument with above recommendations but we did it a little different. We added a couple small fuse panels and connected them through a Midnite Solar Baby Box with DC breakers. I wanted to be able to isolate the loads and sized the breakers to to protect the downstream wire and panels. Also rerouted the main DC fuse panel through the breaker box. For wire, we used 4 awg and 8 awg wire connected to 60A and 30A breakers respectively. As i recall, the 8 awg is MTW and 4 awg is welding cable. Blue Sea has a handy DC wire selection chart which will give you guidance for sizing. For our short runs, go with the heavier gauge wire; cost difference is minimal between sizes. Jim & Wilma 2006 Travel Supreme 36RLQSO 2009 Volvo VNL730, D13, I-shift, ET, Herrin Hauler bed, "Ruby" 2017 Smart Class of 2017 Link to comment Share on other sites More sharing options...
adept99 Posted December 30, 2016 Report Share Posted December 30, 2016 Just as a point of interest, consider adding 2 boxes, one switched (at the ignition key) and one unswitched. Hook lights and similar stuff to the switched box so you can't walk away and leave something on, and the unswitched for things where you want (or need) to use the native switch of the item you're connecting. Good Luck Paul BTW - I used some flexible plastic conduit to route the wire. Makes future circuits MUCH easier to install. Paul & Paula + Daisy the amazing wiggle worm dog... 2001 Volvo 770 Autoshift, Singled, w/ Aluminum Bed - Toy Draggin 2013 395AMP XLR Thunderbolt Toy Hauler 2013 Smart Passion 2012 CanAm Spyder RT 2013 Harley Davidson Street Glide Link to comment Share on other sites More sharing options...
Jack Mayer Posted December 30, 2016 Report Share Posted December 30, 2016 The above advice is all pretty good. For the BEST wire run, use the marine wire that Randy mentions. It is always best. But the welding wire is generally what I use because it is more available. You can "mail order" either one, though. I ALWAYS dd both a switched (ignition) and unswitched (constant) loadcenter. You will not regret doing that over the course of time. I usually also add a few relays when I put in the loadcenter. Eventually you will use them, if you don't right away. I mount the Jackaloppee, the loadcenters, etc. on a plywood backer and build it on the bench. then just install the entire thing at one time. Jack & Danielle Mayer #60376 Lifetime Member Living on the road since 2000PLEASE no PM's. Email me. jackdanmayer AT gmail 2016 DRV Houston 44' 5er (we still have it) 2022 New Horizons 43' 5er 2016 Itasca 27N 28' motorhome 2019 Volvo 860, D13 455/1850, 236" wb, I-Shift, battery-based APU No truck at the moment - we use one of our demo units 2016 smart Passion, piggyback on the truck -------------------------------------------------------------------------See our website for info on New Horizons 5th wheels, HDTs as tow vehicles, communications on the road, and use of solar powerwww.jackdanmayer.com Principal in RVH Lifestyles. RVH-Lifestyles.com Link to comment Share on other sites More sharing options...
Jim & Wilma Posted December 30, 2016 Report Share Posted December 30, 2016 Here's a handy reference of some of the various DC cable used in the transportation field. When buying any electrical product, look for the applicable compliance standard/testing agency marks and satisfy yourself it covers your intended application. Jack, Did something change in your signature line? Jim & Wilma 2006 Travel Supreme 36RLQSO 2009 Volvo VNL730, D13, I-shift, ET, Herrin Hauler bed, "Ruby" 2017 Smart Class of 2017 Link to comment Share on other sites More sharing options...
billr Posted December 30, 2016 Report Share Posted December 30, 2016 I wish I had used two load centers for the 12v users when I built my elec center. Switched with ign. Cool setup. Bill and Joan and 3 Collie pups 2001 Volvo VNL 770 "The Doghouse" Singled short, "ET" hItch VED12 465HP Gen 1 Autoshift 3.58 ratio 2005 Mobile Suite 38RL3 2011 Smart Passion loaded piggybacK Weigh-It Portable RV Scales http://www.weighitrv.com/ Link to comment Share on other sites More sharing options...
HERO Maker Posted December 30, 2016 Report Share Posted December 30, 2016 Jack, Did something change in your signature line? You have some good eyes Jim! Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
Jack Mayer Posted December 30, 2016 Report Share Posted December 30, 2016 Very observant, Jim. Jack & Danielle Mayer #60376 Lifetime Member Living on the road since 2000PLEASE no PM's. Email me. jackdanmayer AT gmail 2016 DRV Houston 44' 5er (we still have it) 2022 New Horizons 43' 5er 2016 Itasca 27N 28' motorhome 2019 Volvo 860, D13 455/1850, 236" wb, I-Shift, battery-based APU No truck at the moment - we use one of our demo units 2016 smart Passion, piggyback on the truck -------------------------------------------------------------------------See our website for info on New Horizons 5th wheels, HDTs as tow vehicles, communications on the road, and use of solar powerwww.jackdanmayer.com Principal in RVH Lifestyles. RVH-Lifestyles.com Link to comment Share on other sites More sharing options...
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