Calculator · 110V / site transformer
110V transformer heater check
Check whether a 110V site transformer can realistically power temporary heaters, dehumidifiers, fans or drying kit without overload or ugly voltage drop.
All tools
52 specialist calculators and AI tools.
Temporary power, 110V transformers, RCD leakage, generator kVA, cable reels, voltage drop, phase balance, drying, fans, portable AC, panel schedules, EICR helpers and photo-led AI tools.
Temporary power & protection
#temporary-power
Calculator · RCD / earth leakage
RCD leakage budget
Estimate cumulative leakage from compressors, dehumidifiers, portable AC, heaters, pumps and long wet leads before stacking everything behind one RCD.
Calculator · generator / kVA
Generator kVA + start current
Size a generator for portable AC, dehumidifiers, fans and heaters with a start-current allowance rather than only running watts.
Calculator · three-phase / phase balance
Three-phase load balancer
Allocate single-phase heaters, dehumidifiers, fans and portable AC units across L1/L2/L3 to reduce imbalance and nuisance trips.
Calculator · 13A / 16A
Connector selector
Select a likely temporary connection class based on load current, voltage, environment and duty cycle.
Calculator · RCD Type A / Type AC
RCD type selector
A selector aid for AC, dehumidifiers, inverter drives, electronic controls and mixed temporary HVAC equipment.
Calculator · MCB curve / motor start
MCB curve / motor start
Estimate whether fan or compressor starting current is likely to be harsh for a B, C or D curve MCB.
Calculator · temporary DB / distribution board
Temporary DB planner
Lay out a temporary board for heaters, drying equipment, fans, portable AC and lighting, with circuit groups and notes.
Calculator · PAT / visual inspection
Lead/PAT visual checklist
A practical visual checklist for plugs, sockets, reels, commando connectors and temporary HVAC leads before use.
Electric heater tools
#heaterCalculator · extension lead / cable reel
Heater cable reel derating
Check whether a coiled, partly unwound or long extension reel is a bad match for a 2kW or 3kW temporary heater.
Calculator · amps / kW
Heater amps
Convert heater kW into current at 110V, 230V or 400V and check 13A, 16A, 32A and three-phase supply classes.
Calculator · connector / commando plug
Heater supply selector
Pick the likely connection class for an electric heater: 13A plug, 16A, 32A, 63A or three-phase.
Calculator · sequencing / heater staging
Heater staging sequencer
Plan staged heater switching and phase allocation so large temporary heating sets do not hit one supply at once.
Calculator · ventilation / heat loss
Ventilation heat loss
Estimate extra heat needed when extract fans, open doors or air changes are dragging warm air out of a workspace.
Drying & dehumidifier tools
#drying
Calculator · dehumidifier / litres/day
Dehumidifier litres/day
Estimate litres/day capacity from room volume, temperature, humidity and drying target, then check power requirements.
Calculator · desiccant / refrigerant
Refrigerant vs desiccant
Choose a dehumidifier type based on temperature, RH, target and site conditions.
Calculator · dew point / condensation
Dew point risk
Calculate dew point and cold-surface condensation risk, then decide whether heat, dehumidification or airflow is the first lever.
Calculator · drying / power plan
Drying room power plan
Combine dehumidifiers, air movers and support heaters into a staged circuit plan for drying jobs.
Calculator · condensate / pump
Condensate pump head
Check whether a dehumidifier or portable AC condensate route is likely to need a pump or a shorter drain path.
Calculator · drying log / moisture
Drying log builder
Create a simple daily drying log with RH, temperature, moisture readings, equipment and circuit notes.
Fans, ducts & ventilation
#fans
Calculator · ACH / fan
ACH fan calculator
Estimate airflow required for workshops, drying rooms, stores and warehouses by room volume and target air changes.
Calculator · air mover / drying
Air mover placement
Suggest count and placement pattern for air movers in a drying room based on wet surface area and room shape.
Calculator · ducting / fan derate
Ducting fan derate
Estimate how duct length, bends, inlet restrictions and outlet restrictions reduce nominal fan airflow.
Calculator · air scrubber / negative pressure
Negative pressure / scrubber
Estimate air scrubber airflow needed to maintain containment or repeated air cleaning in a work zone.
Calculator · destratification / warehouse
Destratification savings
Estimate whether destratification fans could reduce heat stacking and improve heater effectiveness in high spaces.
Portable AC tools
#coolingCalculator · portable AC / BTU
Portable AC BTU/kW
Estimate portable AC capacity in kW and BTU/h for offices, plant rooms, events, kitchens and workshops.
Calculator · spot cooling / server room
Spot cooling load
Estimate spot cooling for server rooms, production lines, events and overheated work zones.
Calculator · start current / AC
AC start current
Estimate start-current pressure on breakers or generators for portable AC and compressor loads.
Calculator · AC exhaust / ducting
AC exhaust derate
Estimate cooling performance loss from long exhaust duct runs, bends and recirculation risk.
Calculator · portable AC / condensate
AC condensate plan
Plan tank emptying, gravity drain or pump route for unattended portable AC operation.
Trending electrician calculators
#electricianCalculator · BS 7671 / voltage drop
HVAC voltage drop envelope
Estimate voltage drop over long leads for heaters, air movers, dehumidifiers and portable AC, with compressor start warnings.
Calculator · PFC / PSCC
PFC / fault current
Estimate PSCC or PEFC from Ze and voltage, compare against device breaking capacity, and draft a quick test-sheet note.
Calculator · max Zs / MCB
Max Zs checker
Check a measured Zs value against an entered device limit, with optional 80% rule headroom and clear pass/check wording.
Calculator · CPC / adiabatic
CPC adiabatic
Use the adiabatic equation shape to compare fault current, disconnection time, k factor and CPC size as a planning aid.
Calculator · cable correction factor / Iz
Cable correction factors
Stack ambient temperature, grouping, insulation and installation correction factors to see whether corrected Iz still covers load current.
Calculator · RCD / trip time
RCD trip time checker
Review x0.5, x1 and x5 RCD trip-time readings and produce a clear pass/check prompt for the job file.
Calculator · insulation resistance / IR test
IR test triage
Turn L-N, L-E and N-E insulation-resistance readings into practical next-step notes for damp circuits, appliances and fault finding.
Calculator · ring final / continuous load
Ring final load check
Estimate continuous heater, dehumidifier and socket-load pressure on a ring final circuit, including spurs, adaptors and run-time warnings.
Calculator · DB schedule / test sheet
DB/test sheet checker
Paste circuit and test-sheet notes to flag missing Zs, R1+R2, IR, RCD or breaker details and generate a cleaner copyable schedule.
Calculator · cable size / voltage drop
Cable size + voltage drop
High-demand UK cable and voltage-drop calculator reframed for temporary heaters, fans, dehumidifiers and portable AC.
Calculator · maximum demand / diversity
Max demand + diversity
Estimate realistic demand where heaters, compressors, fans and drying equipment do not all peak together.
Calculator · Zs / R1+R2
Zs / R1+R2
Calculate expected Zs from Ze and R1+R2, or derive R1+R2 from measured Zs for circuit assessment notes.
Calculator · panel schedule / circuit schedule
Panel schedule builder
Create a printable schedule for boards feeding temporary heaters, dehumidifiers, fans, drying kit or AC.
Calculator · EICR / C1
EICR observation coder
Draft C1/C2/C3/FI-style wording for common observations around overloaded sockets, damaged reels, RCD issues and temporary HVAC equipment.
AI site tools
#aiAI tool · AI / panel photo
AI panel photo map
Upload a board photo and create a draft circuit map, breaker list, RCD group notes and temporary HVAC suitability questions.
AI tool · AI / thermal-style
AI thermal-style risk scan
Use a normal phone photo for a thermal-style risk overlay based on visible clues, or upload true thermal imagery when available.
AI tool · AI / nameplate
AI nameplate reader
Upload or type nameplate details from heaters, dehumidifiers, fans or AC units and extract voltage, current, watts, phase and IP hints.
AI tool · AI / plug
AI plug/reel visual check
A photo-led checklist for coiled reels, discolouration, cracked plugs, loose strain relief and overloaded adaptors.
AI tool · AI / drying
AI drying layout
Use a room photo plus measurements to draft dehumidifier and air mover placement notes for drying jobs.
AI tool · AI / method statement
Method statement generator
Draft a method statement outline for temporary heating, drying, ventilation or cooling equipment on site.
AI tool · AI / EICR
EICR remedial scope
Turn observations into a clear remedial scope, materials prompt and temporary equipment restriction note.
AI tool · AI / quote pack
Quote pack builder
Create a compact pack with assumptions, equipment list, circuit plan, risk flags and NHS category references.