HHTraff

HHTraff is a free toolkit for electrical and traffic-signal field

technicians working under New Zealand and Australian wiring rules.

CALCULATORS — all offline, all free

• Cable Sizer — pick the smallest cable that handles the load with

temperature and grouping derating applied. Common preset wiring

scenarios make it fast for everyday jobs.

• Voltage Drop — calculate drop using the mV/A/m method for single

and three-phase circuits, with live max-length and max-load

readouts so you can see how much headroom you have.

• Circuit Check — verify a cable, breaker, load and length combo

against AS/NZS 3000 voltage drop limits in one screen.

• Earth Fault Loop — confirm Zs is low enough for the protective

device to disconnect, with both measured and calculated modes.

Calculations are based on AS/NZS 3000 and AS/NZS 3008 reference

data. Always verify against the wiring rules that apply in your

jurisdiction — HHTraff is a reference tool, not a substitute for

the standards or for a qualified electrical worker.

REFERENCE TOOLS — also offline, also free

• Unit Converter — quick conversions for everyday field work:

cable cross-section (mm² ↔ AWG ↔ kcmil), power (W, kW, HP, BTU/h),

temperature (°C, °F, K), and length, area and volume in both

metric and imperial units. Live two-way conversion as you type.

• Cable Colours — regional wire colour reference for NZ/AU,

UK, US (NEC) and EU (CENELEC) installations, plus T568A vs T568B

RJ45 4-pair UTP pinouts for structured-cabling work. Read-only,

no internet needed.

DIAGNOSTIC TERMINAL

HHTraff includes a VT100-style serial terminal for connecting to

traffic-signal controllers (ATSC4, TOPAS 2500B and others) over

USB or Bluetooth. Field technicians can review controller menus,

capture log files to the device, and browse a built-in command

quick reference for common controller families.

WHO IT'S FOR

• Registered electricians on residential, commercial and industrial

jobs in New Zealand and Australia

• Traffic-signal technicians servicing intersection cabinets

• Structured-cabling and data installers needing a quick T568A/B

reference on site

• Apprentices learning the AS/NZS calculation methods

PRIVACY

HHTraff does not collect personal data, location, or analytics.

See phaselogic.app/privacy for full details.