A charge point data sheet gives a maximum current of 32 A at 230 V. What power does that actually represent?

32 A × 230 V = 7,360 W, which is 7.36 kW. That is why a 32 A unit is sold as 7 kW or 7.4 kW. 6.90 kW is 30 A × 230 V, the figure you get by working backwards from 7,000 W, which understates the current the unit really draws. For demand and circuit design, use the 32 A from the data sheet.

Which description matches load curtailment as Regulation 722.311.201 uses the term?

722.311.201 lets load curtailment, by reducing or disconnecting load, automatically or manually, be taken into account when maximum demand is determined. It is a real limit on the current. An allowance for loads not coinciding is diversity, which Section 722 does not give for EV charging, and a bigger fuse is a supply change, not curtailment.

An allowance for loads that rarely run together

Reducing or disconnecting load, automatic or manual

A larger cut-out fuse to carry the full demand

The OSG diversity allowances applied to the charger

On a survey visit the cut-out fuse rating is not marked anywhere you can read it. What is the right next step?

You must not open the cut-out unless the DNO has authorised you. If the rating is not visible, ask the DNO or send a photograph of the cut-out. A known cut-out rating is one of the connect-and-notify criteria, so guessing it, at 100 A or anything else, defeats the adequacy-of-supply check that 132.16 requires.

Remove the cut-out fuse carrier and read the fuse

Assume 100 A, as most modern cut-outs are that size

Ask the DNO, with a photo, and leave the cut-out sealed

Assume 60 A and design the whole job to stay under that

Free mock exam

Design — EV Charging Installation Practice

Free topic-focused mock exam: all 30 questions on Design, drawn from the wider EV Charging Installation bank. 35-minute timer, 70% to pass, worked explanation on every question. Use this when you've taken the full mock once and want to drill the topics you got wrong.

Questions: 30
Time limit: 35 min
Pass mark: 70% · 21/30
Question bank: 30

Free, no sign-up. Retake as many times as you like — the questions are reshuffled, with the answer order changed.

Sample questions

01A charge point data sheet gives a maximum current of 32 A at 230 V. What power does that actually represent?
- A8.00 kW
- B6.90 kW
- C7.00 kW
- D7.36 kW
Why: 32 A × 230 V = 7,360 W, which is 7.36 kW. That is why a 32 A unit is sold as 7 kW or 7.4 kW. 6.90 kW is 30 A × 230 V, the figure you get by working backwards from 7,000 W, which understates the current the unit really draws. For demand and circuit design, use the 32 A from the data sheet.
02Which description matches load curtailment as Regulation 722.311.201 uses the term?
- AAn allowance for loads that rarely run together
- BThe OSG diversity allowances applied to the charger
- CA larger cut-out fuse to carry the full demand
- DReducing or disconnecting load, automatic or manual
Why: 722.311.201 lets load curtailment, by reducing or disconnecting load, automatically or manually, be taken into account when maximum demand is determined. It is a real limit on the current. An allowance for loads not coinciding is diversity, which Section 722 does not give for EV charging, and a bigger fuse is a supply change, not curtailment.
03On a survey visit the cut-out fuse rating is not marked anywhere you can read it. What is the right next step?
- AAsk the DNO, with a photo, and leave the cut-out sealed
- BAssume 60 A and design the whole job to stay under that
- CRemove the cut-out fuse carrier and read the fuse
- DAssume 100 A, as most modern cut-outs are that size
Why: You must not open the cut-out unless the DNO has authorised you. If the rating is not visible, ask the DNO or send a photograph of the cut-out. A known cut-out rating is one of the connect-and-notify criteria, so guessing it, at 100 A or anything else, defeats the adequacy-of-supply check that 132.16 requires.

Common questions

Is the Design mock exam free?

Yes — 100% free, no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.

Can I retake the mock exam?

Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.

Does this count towards the real qualification?

No — this is independent practice material. To gain the actual qualification you need to sit the official assessment through an approved provider.