I.S. 10101 / ET101 Wiring Rules case studies
I.S. 10101 / ET101 Wiring Rules · Put your knowledge to work in context.
10101 is the Irish national standard for electrical installations, the document most electricians still call ET101. It sets out how a installation must be designed, selected, erected, inspected and tested so that people, livestock and property are protected against shock, fire, overcurrent and thermal damage. The I.S. 10101 / ET101 Wiring Rules case studies are 5 cases and about 3,047 words.
1Adding a Shower Circuit to an Older Dwelling
A 1970s semi-detached house has a consumer unit with rewireable fuses, a 30 mA RCD added only to the socket circuits, and a TN-C-S supply with a declared external loop impedance (Ze) of 0.35 Ω. The owner wants a 9.5 kW electric shower installed in an upstairs bathroom.
597 words, about 3 min2Construction Site Distribution Board
A temporary construction site uses a 400 V three-phase supply via a 63 A TP&N distribution board feeding four 32 A single-phase outlets for tools, a 16 A outlet for a site office, and a 16 A outlet for a 110 V transformer. The site is muddy, and trailing leads are common.
655 words, about 3 min3Cable Buried in a Wall in a Kitchen
A kitchen refurbishment involves chasing a 2.5 mm² twin-and-earth cable into a plastered wall to supply a new double socket. The chase is about 30 mm deep, and the cable is covered by plaster with no earthed metallic covering or conduit.
624 words, about 3 min4Inspection and Testing of a Modified Circuit
An electrician has added a new radial circuit for a utility room with three double sockets, protected by a 20 A MCB and a 30 mA RCBO. The circuit is 18 m of 2.5 mm² twin-and-earth, clipped direct, with a 4 mm² protective conductor run separately to a local earth bar.
561 words, about 3 min5Agricultural Installation with Livestock
A farm building houses cattle and has a 230 V lighting circuit and a 400 V three-phase supply to a feed auger motor. The building is of steel-framed construction with metallic cladding, and the floor is concrete that is often wet.
610 words, about 3 min