Davey said:

My colleague and I think this is poor practice and think an isolating gland should have been fitted or the armoured terminated into a plastic enclosure prior to entering the charger. the below regulations are what we believe are contravened. 

It's not unusual to see armoured cables enter through stuffing glands into an internal enclosure or similar, but you need to check the stuffing glands are OK for this.

However 'taping up' is not really insulation, and (with reference to Reg 411.3.1.1, 'Simultaneously accessible exposed-conductive-parts shall be connected to the same earthing system individually, in groups or collectively') what is there to protect electricians carrying out repair/testing from 'simultaneous contact' risk between the two earthing systems?

Cold shrink sleeving is best for this. If the armour (as cpc) is required to be accessible for testing, then something more than 'tape that can be removed' such as insulate the armour with cold-shrink sleeving and if something available for testing is needed, provision of an insulated tail to a suitable 4 mm shrouded test terminal (all insulated), and suitable labelling, would be a better approach ...

So, I would agree, this is a CDM risk that should have been evaluated and something more suitable put in place. This applies even for non-notifiable installations, and non-workplaces, as under CDM designers have a duty to ensure the installation is safe to maintain.

Stuffing glands chosen to grip the SWA adequately, will provide an IP seal where an SWA enters a box, with the outer sheath unbroken.

Done properly, that is perfectly fine, if that is what you wish to achieve.

Is the tape providing site applied insulation to armour on the outside of the box that would be exposed to touch it it were removed, or is it inside an enclosure  that prevents touch ?

The former I'd worry about, the latter less so.  PVC insulation tape is pretty poor as insulation despite the title, and there are better products, as Graham notes, the cold shrink rubber boots are very good, as are the glue lined heat shrinks. Self amalgamiting tape when applied as per the makers instructions cannot be removed by unpicking and as such is as permanent without the use of tools.

The norm for testing Zs is to comb a few strands into some sleeving, and put to a terminal, much as one might terminate split concentric, and then to over sleeve the whole cable in a way that ties in any ends that are cut short. The hazard  of exposure to an 'out of area' cpc potential is comparable to that from an exposed neutral bus bar and there are plenty of those accessible once CU covers are removed and very few dead bodies, it needs to be clear what it is, and that only those skilled in the art will have the lid off.

It may not be beautiful, but  it's not bad.

Mike.

Stuffing glands chosen to grip the SWA adequately, will provide an IP seal where an SWA enters a box, with the outer sheath unbroken.

Done properly, that is perfectly fine, if that is what you wish to achieve.

Is the tape providing site applied insulation to armour on the outside of the box that would be exposed to touch it it were removed, or is it inside an enclosure  that prevents touch ?

The former I'd worry about, the latter less so.  PVC insulation tape is pretty poor as insulation despite the title, and there are better products, as Graham notes, the cold shrink rubber boots are very good, as are the glue lined heat shrinks. Self amalgamiting tape when applied as per the makers instructions cannot be removed by unpicking and as such is as permanent without the use of tools.

The norm for testing Zs is to comb a few strands into some sleeving, and put to a terminal, much as one might terminate split concentric, and then to over sleeve the whole cable in a way that ties in any ends that are cut short. The hazard  of exposure to an 'out of area' cpc potential is comparable to that from an exposed neutral bus bar and there are plenty of those accessible once CU covers are removed and very few dead bodies, it needs to be clear what it is, and that only those skilled in the art will have the lid off.

It may not be beautiful, but  it's not bad.

Mike.