Contents
- 1 Can I have multiple consumer units?
- 2 Can you run a consumer unit off another consumer unit?
- 3 How long can consumer unit tails be?
- 4 Can you extend cables in a consumer unit?
- 5 Is 17th edition still valid?
- 6 Can I change a consumer unit myself?
- 7 When do you need overcurrent protection in a building?
- 8 What are the requirements for overcurrent protection of conductors?
Can I have multiple consumer units?
I don’t know if his garage is attached to the house, but he said his electrician had no issues and just put warning labels on each consumer unit indicating that there were multiple isolation points. You can certainly have as many CUs as you want.
Can you run a consumer unit off another consumer unit?
Yes you can fit second consumer unit common when supplying showers and sheds you may have to use two lighting circuits as most light fitting need fusing to 6 amp. There are three ways to connect with henley block or from existing consumer unit and latter with approved cable or twin and earth.
Can I install a 17th edition consumer unit?
Under the 17th Edition requirements it is still possible to install some circuits in domestic premises that are not fed via an RCD. Different wiring systems would need to be used.
Does garage supply need RCD?
The cable that supplies the garage unit with power may very well need RCD protection itself. A circuit only requires to be covered by one 30m/a RCD which is already in the main consumer unit (if it isn’t, then that needs doing first), so only a main switch is needed in the garage unit.
How long can consumer unit tails be?
3 metres
The meter tails between the meter position and your consumer unit should not be longer than 3 metres.
Can you extend cables in a consumer unit?
For extending normal T&E type cables here it is fairly simple, you can use DIN rail mounted terminals, or the Wago spring-loaded ones, so long as they are suitable protected. Normally you would not “extend” the tails if practical, you would replace them to avoid necessary high-current joints.
Does a garage consumer unit need to be earthed?
The supply to the garage, being a distribution circuit, will require a fault to earth to clear within 5 s (Regulation 411.3.2.3 refers). Furthermore, the circuit supplying socket-outlets in the garage will require additional means of protection from an RCD having the characteristics complying with Regulation 415.1.
What is the difference between consumer unit and distribution board?
The short answer is that a consumer unit is a type of distribution board. In other words, all consumer units are distribution boards, but not all distribution boards are consumer units. Consumer units are the type of panelboards most often found in buildings in the UK.
Is 17th edition still valid?
Although the 17th Edition of BS 7671 is due to be replaced by the 18th Edition in January 2019, the 17th Edition is relevant today and will still be as relevant long after that date. Any installation designed before January 2019 would only need to comply with the 17th Edition.
Can I change a consumer unit myself?
You can replace your consumer unit without disconnecting the power as long as you’re careful. Also, if you want or need to replace the meter tails to the consumer unit, you must involve the electricity board who will wire them into the sealed meter for you.
Does a sub main need to be RCD protected?
If an upfront RCD was to be fitted, would this have to be a 100mA Time delayed RCD as each flat is protected by their own 30mA RCD and some discrimination between the 2 units is needed….See Also:
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What are three types of overcurrent protection ( OCP )?
Overcurrent protection (OCP) protects a circuit from damage due to an overcurrent condition. There are three types of overcurrent conditions to consider in typical NEC applications:
When do you need overcurrent protection in a building?
Several articles applicable to commercial buildings modify the general NEC rule for overcurrent protection, as summarized below: 240.4 (A) Power Loss Hazard. If circuit interruption due to an overload condition could create a hazard—for instance, shutting down a fire pump-overload protection is not required. Short-circuit protection is required.
What are the requirements for overcurrent protection of conductors?
The general requirement for overcurrent protection of conductors is provided in Section 240.4, Protection of Conductors. The basic rule for overcurrent protection of conductors—other than using flexible cords, flexible cables, and fixture wires—is to protect the conductor in accordance with the ampacities specified in Section 310.15.
How to protect a circuit from dangerous overloads?
Ascertain how to protect a circuit from dangerous overloads and short-circuits. Review overcurrent protection for certain types of building equipment. Overcurrent protection seems like a simple concept: Limit the current flow in a circuit to a safe value. Electrical designers face this task daily. But there is much more to it.