---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 04/16/18: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:20 AM - Re: z13 battery bus protection (mmcelrea) 2. 12:48 AM - Re: z13 battery bus protection (user9253) 3. 07:57 AM - Re: Re: z13 battery bus protection (Robert L. Nuckolls, III) 4. 12:41 PM - Re: Re: z13 battery bus protection (William Daniell) 5. 01:00 PM - Re: Re: z13 battery bus protection (Charlie England) 6. 03:37 PM - Re: Bulb replacement for my Sandel 3308 EHSI (blues750) 7. 06:28 PM - Re: Re: z13 battery bus protection (Robert L. Nuckolls, III) 8. 09:59 PM - Re: z13 battery bus protection (mmcelrea) ________________________________ Message 1 _____________________________________ Time: 12:20:13 AM PST US Subject: AeroElectric-List: Re: z13 battery bus protection From: "mmcelrea" Hi. I have no intention of messing with cbs or fuses in flight. The fuse blocks are mounted on a drop down panel between the main and sub panels. I dont want to mount the battery bus on the firewall but as this will require a longer wire does it now need protecting? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479352#479352 ________________________________ Message 2 _____________________________________ Time: 12:48:25 AM PST US Subject: AeroElectric-List: Re: z13 battery bus protection From: "user9253" Usually the main bus feeder does not have protection other than the ability for the pilot to shut it off via the battery contactor. As for the #14 AWG wire connecting the battery to the battery bus, an 18 AWG fuselink could be used. The 6 inch rule is a rule of thumb, not mandatory. The longer the wire, the greater the chance of it making sparks which will ignite gasoline after a forced landing. Protect it well. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479353#479353 ________________________________ Message 3 _____________________________________ Time: 07:57:34 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: z13 battery bus protection At 02:47 AM 4/16/2018, you wrote: > >Usually the main bus feeder does not have protection other than the >ability for the pilot to shut it off via the battery contactor. >As for the #14 AWG wire connecting the battery to the battery bus, >an 18 AWG fuselink could be used. The 6 inch rule is a rule of >thumb, not mandatory. The longer the wire, the greater the chance >of it making sparks which will ignite gasoline after a forced >landing. Protect it well. An extended bus feeder calls for fault protection . . . protection that needs to be very robust in comparison with the loads on the bus (and associated protections). Since you're using fuses on the extended bus (MUCH faster than breakers) and given that this bus is always hot, I suggest that the feeder be increased to 10AWG and that it be protected with a 30A Maxifuse; much faster than a fusible link in a fault condition and much more robust than any single feeder off that bus . . . you don't want a fault on a single distribution to open the feeder fuse and take down the whole bus. Bob . . . ________________________________ Message 4 _____________________________________ Time: 12:41:32 PM PST US From: William Daniell Subject: Re: AeroElectric-List: Re: z13 battery bus protection In this scenario, is there any reason why an ATC fuse bus (20 slot bandc type) could not be fed from batt and alt straight into the buss through two of the faston tabs? (As opposed to the main bolt terminal) Each slot could have a 30a maxifuse? Will On Mon, Apr 16, 2018, 12:05 Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 02:47 AM 4/16/2018, you wrote: > > > Usually the main bus feeder does not have protection other than the > ability for the pilot to shut it off via the battery contactor. > As for the #14 AWG wire connecting the battery to the battery bus, an 18 > AWG fuselink could be used. The 6 inch rule is a rule of thumb, not > mandatory. The longer the wire, the greater the chance of it making sparks > which will ignite gasoline after a forced landing. Protect it well. > > > An extended bus feeder calls for > fault protection . . . protection > that needs to be very robust in > comparison with the loads on the > bus (and associated protections). > > Since you're using fuses on the extended > bus (MUCH faster than breakers) and > given that this bus is always hot, I > suggest that the feeder be increased > to 10AWG and that it be protected > with a 30A Maxifuse; much faster than > a fusible link in a fault condition > and much more robust than any single > feeder off that bus . . . you don't > want a fault on a single distribution > to open the feeder fuse and take down > the whole bus. > > > Bob . . . > ________________________________ Message 5 _____________________________________ Time: 01:00:06 PM PST US Subject: Re: AeroElectric-List: Re: z13 battery bus protection From: Charlie England What's the goal? If you're trying to protect the bus, it's an unneeded failure point when inserted as a 'master protection device' (detailed in Bob's earlier linked articles). If protecting the wire, the fuse is on the wrong end of the wire. On 4/16/2018 2:40 PM, William Daniell wrote: > In this scenario, is there any reason why an ATC fuse bus (20 slot > bandc type) could not be fed from batt and alt straight into the buss > through two of the faston tabs? (As opposed to the main bolt > terminal) Each slot could have a 30a maxifuse? > > Will > > > On Mon, Apr 16, 2018, 12:05 Robert L. Nuckolls, III > > > wrote: > > At 02:47 AM 4/16/2018, you wrote: >> > >> >> Usually the main bus feeder does not have protection other than >> the ability for the pilot to shut it off via the battery contactor. >> As for the #14 AWG wire connecting the battery to the battery >> bus, an 18 AWG fuselink could be used. The 6 inch rule is a rule >> of thumb, not mandatory. The longer the wire, the greater the >> chance of it making sparks which will ignite gasoline after a >> forced landing. Protect it well. > > An extended bus feeder calls for > fault protection . . . protection > that needs to be very robust in > comparison with the loads on the > bus (and associated protections). > > Since you're using fuses on the extended > bus (MUCH faster than breakers) and > given that this bus is always hot, I > suggest that the feeder be increased > to 10AWG and that it be protected > with a 30A Maxifuse; much faster than > a fusible link in a fault condition > and much more robust than any single > feeder off that bus . . . you don't > want a fault on a single distribution > to open the feeder fuse and take down > the whole bus. > > > Bob . . . > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 6 _____________________________________ Time: 03:37:53 PM PST US Subject: AeroElectric-List: Re: Bulb replacement for my Sandel 3308 EHSI From: "blues750" Am I tilting at windmills with the idea of going to LEDs? [Wink] Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479386#479386 ________________________________ Message 7 _____________________________________ Time: 06:28:49 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: z13 battery bus protection At 02:40 PM 4/16/2018, you wrote: >In this scenario, is there any reason why an ATC >fuse bus (20 slot bandc type) could not be fed >from batt and alt straight into the buss through >two of the faston tabs?=C2 (As opposed to the >main bolt terminal) Each slot could have a 30a maxifuse? Recall that circuit protection is for WIRES . . . and that the protective device is installed as close as practical to the SOURCE of energy that puts the wire at risk. In this case, a MAXIfuse in an in-line holder taps power off the hot side of the battery or starter contactors. Energy is then conducted via the 10AWG feeder to the input stud on the fuseblock. What loads are being assigned to this bus? Bob . . . ________________________________ Message 8 _____________________________________ Time: 09:59:26 PM PST US Subject: AeroElectric-List: Re: z13 battery bus protection From: "mmcelrea" In that case could a fuse link be used on the source end of the wire to protect the wire and then feeding the bus via one of the fast on rather than the main bolt terminal to provide fast blow protection to prevent the bus being taken out? Would 12awg feed wire with 16awg fuselink suffice, or 10awg with 14awg fusel-ink The bus is supplying the essential bus as backup max load approx 15 amps. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479390#479390 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.