National Electric MFGTemporary power • HVAC load tools
Methodology

Electrical calculator · 13A / 16A / 32A / 63A / commando

13A, 16A, 32A & 63A Connector Selector

Select a likely temporary connection class based on load current, voltage, environment and duty cycle.

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For heaters, dehumidifiers, fans, portable AC and temporary distribution planning.

Field notes

Field notes for Connector selector

Practical checks to run before this calculator result turns into a site decision.

Site check

Connector colour and rating are only the start

Check voltage, phase, pin configuration, current rating and whether the equipment is intended for that supply type.

Site check

Do not adapt your way out of a bad match

A chain of adaptors can hide overload and RCD issues. Use the correct temporary distribution and cable for the load.

Site check

Label the hire setup clearly

Mixed 16A, 32A and 63A equipment needs clear labels so the site team does not move loads onto the wrong outlet.

FAQ

Connector selector FAQ

Short answers written for UK temporary electrical and HVAC planning work.

What is the Connector selector used for?

Select a likely temporary connection class based on load current, voltage, environment and duty cycle. It is mainly for temporary HVAC, drying, cooling and site-power planning, especially where a quick pre-check is needed before selecting equipment or changing a temporary setup.

Can this replace BS 7671 design, inspection or testing?

No. It is a competent-person planning aid only. Final decisions still need current BS 7671 requirements, manufacturer data, inspection, testing, risk assessment and the actual site conditions.

What should I verify before acting on the result?

Check supply rating, protective device rating, cable length, voltage drop, start current, phase balance and the condition of temporary leads or distribution boards. If any assumption is uncertain, use the result as a prompt to investigate rather than as permission to energise.

What does an amber or red result usually mean?

It normally means the margin is weak, an assumption is missing, or the load should be split, staged, moved closer to the supply, reduced or reviewed by a competent electrician before use.

Next tools in this workflow

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