Asking for information only - no forseeable plans!What is the usual configuration for a light industrial electricalinstallation?Following mostly from observation & guesswork - please correct asnecessary:Incomer, 3 phases and neutral + earth (depending on local earthingarrangements)Each phase fused at 100A (or whatever, but I'm guessing this is acommon setup)Single meter, but recording consumption on each phaseSingle (or several) consumer unit(s) each carrying all 3 phases.Distribution of 3 phase to machinery (usually hardwired) is each on aseperate MCB - no ringsSame with hard wired single phase machines -all spurs, no rings.All hardwired machines must have an isolator next to them (and anNVR?)There are also single phase (16A?) "blue" sockets for non-hardwiredmachinesWhat's the rating on 3 phase connectors?Regular 3-pin socket outlets, where used, are connected onto a singlephase per floor - ring mains used?.Lighting may be on a different phase per parallel strip to reducestrobing problems (loop in used like domestic?)RCD's - not used on hardwired machines, may be present on single phaseoutlets (never on 3 phase outlets?)What would be a typical cost for a 3 phase new connection, assumingit's available nearby?Are standing charges and per unit charges similar to domestic tariffs?

On 5 Apr 2007 12:38:58 -0700, " " mused:Maybe, or single phase.Could be, or 80A, or 60A, or whatever.Maybe, or several meters. Depends on who what and whenwhy etc...Maybe, or none carrying all 3 phases, or several carrying 1 phase, or1 carrying 1 phase.Usually.Sometimes, sometimes not. Depends on the installation.No, al hardwired machines should have an isolator withiun a reasonabledistance, and they don't need an NVR depending on what they are.Sometimes, sometimes there aren't. Depends on the machines and job.Depends what the rating is, could be anything from 1A to hundreds.Maybe, could be a phase per flooroomreauildingnything. Couldbe ring main, or not. Depends.Maybe, maybe not. Depends on the job.Nope, could be used on single or 3 phase, or none. Depends on site.What ratiing, wiring method, distance, works involved etc...How long is a piece of string?Yes, in the way they work. Often different on charges though.If you want to ask any more vague questions feel free.

Light Industrial Electrical Installations - how?

Apr 05, 2007 21 Replies

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Rumble 19 years ago

Ah, sorry - I was complaining about the lack of a capital V, not the

400/415 thing. Ignore me I'm being pedantic.

Just to clarify, I was referring to 415V warning stickers on "grid switches" (and in particular in office areas), not on switchgear/appliances on the shop floor, where one would certainly expect to see appropriate labelling.

Andy Wade has kindly cited the relevant regulation (541-10-01) in another message.

Cheers,

Rumble

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nightjar 19 years ago

A good general rule is to assume that you are working with idiots, as one eventually will come along. In this case, marking the hazard will not be wrong, which IMO makes marking it preferable to not marking it.

Colin Bignell

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