Commercial CU change - legalities etc.

[MFS Electrical]

This seems like another how to over complicate everything that should be simple thread

Or how to simplify over complicated things, nah you were right the first time

 

[The Ghost]

Anyway I know that's a trick question.

 

[westward10]

One that conforms to BS EN 60947-2 and has a higher rating in terms of breaking capacity ?

So an mccb then?

 

[westward10]

An MCB rated as stated at 10Ka are generally used more in a commercial situation and if you ask at a wholesalers for an MCB for domestic purposes you will normally be offered a 6Ka rated MCB.
Miniature Circuit Breakers (MCB) guide | Newey & Eyre - http://www.neweyandeyre.co.uk/guide-to/miniature-circuit-breakers
say;
i.e. An MCB’s circuit rating is given in Kiloamps (KA), and this indicates the level of its ability to work. For example a domestic MCB would normally have a 6KA fault level, whereas one used in an industrial application may need a unit with a 10KA fault capability.

I would never ask a wholesaler what protective device I should use for a particular application.

 

[Andy78]

So an mccb then?

No. BS EN 60947-2 also covers standard mcbs for use within commercial and industrial environments. Most manufacturer's ranges of 10kA and upwards will be to this standard.

 

[davesparks]

What exactly is a commercial mcb?

There are two standards for MCBs, 60898 covers MCBs for domestic and similar applications and 60947 covers other applications.
Generally a 60898 mcb will have a 6kA rating and won’t necessarily comply with 60947, whereas a 60847 mcb will generally have a 10kA+ rating and will be ‘dual rated’ to 60898 also

 

[Toneyz]

It's not a trick question some manufacturers produce an RCBO in B & C curve 6 and 10 KA domestic short neutral fly leads and long for three phase.

 

[davesparks]

You can see from this mcb that it is rated to both 60947-2 and 60898-1

 

[telectrix]

but i

You can see from this mcb that it is rated to both 60947-2 and 60898-1


View attachment 42132

but it's made in France. it will probably break down just after the warranty expires.