Load
Review how the SOG II Type B Floor Ventilation connects, how it operates and which installation requirements apply to this model.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
The retained original instructions document the roller-switch logic and maintenance but not a complete fuse/cable/terminal schedule. Use the supplied kit harness; no invented motor current or pin map.
The retained original instructions document the roller-switch logic and maintenance but not a complete fuse/cable/terminal schedule. Use the supplied kit harness; no invented motor current or pin map.
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Installation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. SOG Type B maintenance and operating instructions 90255; Type A/B microswitch instructions), checked 2026-10-01. Manufacturer documentation →
This is the SOG II Type B floor-outlet system for a Thetford C200 cassette toilet. The 2025 manufacturer brochure identifies the SOG system family as 12 V. It uses a fan and replaceable floor filter, so it must not inherit the door-filter or roof-vent maintenance procedure. The retained manufacturer documents cover Type B operation and its Type A/B microswitch installation; they do not provide a complete fuse and extension-cable schedule.
The manufacturer microswitch drawing places the roller against the rear edge of the sliding handle. The pressed microswitch interrupts the electrical feed; opening the blade releases it and starts the fan. Mount the bracket in the illustrated direction and secure it as instructed, including the stated additional rivet. Reversing this relationship can leave the fan running with the toilet closed.
The symbol's positive and negative poles represent the complete kit's 12 V feed, including its dedicated switch harness. They are not a replacement pinout for the microswitch or motor. The reviewed instructions do not establish a complete terminal colour map, branch fuse, motor startup current or extension size. Confirm those from the exact supplied electrical instructions before wiring; the detail page intentionally provides an overview rather than an apparently complete generic circuit.
The English Type B instructions, PDF page 2, require disconnecting the suction hose from the green coupling before withdrawing the cassette. Fit the supplied black closure for emptying, then restore the hose connection when reinstalling the cassette. Do not pull the cassette against an attached hose or leave the ventilation path disconnected after servicing.
Operate the blade through its full travel and confirm that fan operation matches the intended switch sequence without binding. Check the hose and floor outlet for obstruction and leakage. The floor filter cartridge is replaced annually according to the manual: remove the fan from its rubber seating, replace the cartridge and refit the fan fully using the prescribed method. Isolate power before working on the fan or switch.
Build it out
Add SOG II Type B to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
+
pos
positive · input
−
neg
negative · input
A dash means a current rating is not specified here.
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.