Heated Bed SSR Wiring Size

[Surgikill]

I would stay away from the PTFE coated stuff. I tried to use it and it was an absolute pain in thee ass to strip with wire strippers because it was so slippery and it wouldn't bend at all. I would just go with some silicone wire from amazon made by BNTECHGO. Nice and flexible and will carry plenty of current.

[3mm]

@surgikill

I use a Sears stripping tool, which cost around $12 US to strip my PTFE insulated wire. Good materials require good tools too.

I use the PTFE because it is superior material. Its great.

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[Surgikill]

@3mm said in Heated Bed SSR Wiring Size:

@surgikill

I use a Sears stripping tool, which cost around $12 US to strip my PTFE insulated wire. Good materials require good tools too.

I use the PTFE because it is superior material. Its great.

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I use a $40 wire stripper to strip the wires, and it just glides over the surface and won't bite the PTFE........ I also can't grab onto it because it's PTFE and super slippery. The only thing it's good fir is making wiring harneses that won't flex. The silicone wire is pretty much better in every regard for a hobbyist.

[3mm]

@surgikill

I'm not intending to be insulting, but rather, share my experience with the good stuff. It is true that many stripping tools do not work well with Teflon type insulated wire, however, I searched around for tools that do work well with Teflon, in fact I went to my tool lock and got out the four tools that I use here at home to get the part numbers for y'all, two of which I bought at Sears and one online. I'll list them below with their URLs and prices. These work well with PTFE, Teflon, PVC, HHTN, HU, TVNH, eg, all of them including high-voltage silicon. I imaged the two tools that I use the most for your perusal.

Here are the strippers I use:
Strips PVC, Teflon & Silicone wires - Platinum Tools #PN15005 - $13

https://www.specialized.net/platinum-tools-15005c-prostrip-wire-stripper-16-30-awg.html
https://www.alliedelec.com/platinum-tools-15005c/70069526/

Another is Sears Craftsman - Strips PVC, Teflon & Silicone wires perfectly
#73573 (Itm: 00973573000) - 12Ga ~ 16Ga - $14
https://www.sears.com/craftsman-professional-wire-cutter-stripper-pliers-up-front/p-00973573000P

#73574 (Itm: ) 32Ga ~ 22Ga - $13

Although not my favorite tool as this one is a bit more cumbersome to use, it is a more traditional style Teflon type stripper tool and it does strip Teflon type insulation perfectly and is fairly inexpensive for its type of tool, as for instance AMP charges around $400 for these type tools.

Sears Tool: #200-003 (Itm: SPM7057351107) - 8Ga ~ 22Ga - $14
https://www.sears.com/eclipse-gum-eclipse-200-003-cp-369ce-wire/p-SPM7057351107

I use the PTFE because it is a superior material and it doesn't shrink when ya solder it and it exhibits a very long oxidization cycle, so crimps do not become Ohmic after a couple of years, etc.

Left - Sears & Right - Platinum Tools

Here's a shot of the DUET-E Controller wired with PTFE, Silicon & PVC Wire

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[3mm]

@blt3dp

The two terminals for the DC Return (aka 'ground'), SHALL be the same size gauge as the power-wires supplying the controller Vin. If your full load current is 18 Amperes, I would recommend adding at least 5 Amperes for load variations and as electronic components age the Amperes invariably increases as components become less efficient, 23 Amperes is likely a good number.

22Ga is ok for small miliAmpere curents but not 10+ Ampere currents.

There are several ways to wire the circuit. I suspect that the simplest is to use one of the control-outputs (as I did) to drive the SSR's control terminals using 22Ga or 24Ga, etc small gauge wire, which will handle the 12 mA SSR control current flow.

When searching for a better priced solid-state-relay (SSR), pay close attention to the specs. There are essentially two types of SSRs, those that switch AC loads and those that switch DC loads. Depending on how the load is powered will mandate the type, DC or AC. Also pay attention to the input Control Voltage rating, as many SSRs will only trigger at 4,5Vdc and above, while the DUET controllers supply 3,3Vdc control Voltage.

There are a few SSRs that trigger at 3,0Vdc upto around 30Vdc and is what you should use if you don't use the DUET MOSFET power-output to control the external SSR which will involve more complicated wiring. The SSR load current rating should be rated at least 50% higher than the actual load current.

Here is the SSR that I've used over the years in numerous projects, it is inexpensive (this forum has also recommended its usage in the past) and it is a reliable product, in my opinion. Shipping cost might be an issue if not shipped in the continental US? This SSR also provides a quite handy red LED that illuminates when the SSR is triggered.

Auber Instruments SRDD-100 SSR

See Auber Instruments at: http://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=288
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This Auber Instruments 'SRDD-100' SSR is rated at 3,0Vdc ~ 32Vdc Control Voltage which switches 5Vdc to 100 Vdc @ 100 Amperes.

The SSR will need to be heat-sinked. I used the switching power-supply aluminum case and used a heat-sink compound to sink off the heat from my 30A load 100 Ampere rated SSR as depicted below.
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SSR Mounted on Top of Power-Supply

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[Surgikill]

I use one of the auto wire strippers. I can't deal with the ones where you have to select the wire size and then hope it doesn't nick part of the wire. I've had the best luck with silicone. Doesn't shrink, doesn't melt, and is easy to handle. Never had an issue with oxidation on anything either.

[Phaedrux]

@3mm said in Heated Bed SSR Wiring Size:

See Auber Instruments at: http://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=288

Thanks for that. I've been looking for a new SSR to replace my suspect Fotek SSR.

[3mm]

@surgikill

I've not actually not worked much with silicon insulated wire, sounds good, I'll give it try. Thanks.

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[pro3d]

I do have some cable size recommendations in this post
https://vkingprinter.com/knowledge-base/cable-managment/

[3mm]

@pro3d

The PA20 crimper is fairly good tool, it is expensive considering that it likely cost 50cents to make or less. But, it is a kewl tool as it crimps many of the popular connector pins hobbyiest use.

Thanks

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